Enum with Fields and Methods - Java Programming

Your Planet enum needs mass and radius for each planet. Enums can have fields, constructors, and methods - they're full classes. Each constant can carry data and provide behavior.

Enum with fields

Add data to each enum constant.

                            mySize
                            mySize = CoffeeSize.MEDIUM (default)mySize = CoffeeSize.SMALLmySize = CoffeeSize.LARGE
                        

                            EnumWithFields.java
                        
Replay: real traced execution (multi-file project)

                            // Enum with fields and constructor
// Concept: enum fields - storing data in enum constants

enum CoffeeSize {
    SMALL(8, 2.50),
    MEDIUM(12, 3.00),
    LARGE(16, 3.50),
    EXTRA_LARGE(20, 4.00);

    private final int ounces;
    private final double price;

    // Enum constructor (always private)
    CoffeeSize(int ounces, double price) {
        this.ounces = ounces;
        this.price = price;
    }

    // Getter methods
    public int getOunces() {
        return ounces;
    }

    public double getPrice() {
        return price;
    }
}

public class EnumWithFields {
    public static void main(String[] args) {
        // Access enum constant data
        CoffeeSize mySize = CoffeeSize.MEDIUM;

        System.out.println("Size: " + mySize);
        System.out.println("Ounces: " + mySize.getOunces());
        System.out.println("Price: $" + mySize.getPrice());


        // Print all sizes with details
        System.out.println("\nAll coffee sizes:");
        for (CoffeeSize size : CoffeeSize.values()) {
            System.out.printf("%s: %doz - $%.2f%n",
                size, size.getOunces(), size.getPrice());
        }

        // Calculate total for multiple coffees
        CoffeeSize[] order = {
            CoffeeSize.SMALL,
            CoffeeSize.MEDIUM,
            CoffeeSize.LARGE
        };

        double total = 0;
        System.out.println("\nOrder:");
        for (CoffeeSize size : order) {
            System.out.printf("  %s: $%.2f%n", size, size.getPrice());
            total += size.getPrice();
        }
        System.out.printf("Total: $%.2f%n", total);

    }
}
// Enum with fields and constructor
// Concept: enum fields - storing data in enum constants

enum CoffeeSize {
    SMALL(8, 2.50),
    MEDIUM(12, 3.00),
    LARGE(16, 3.50),
    EXTRA_LARGE(20, 4.00);

    private final int ounces;
    private final double price;

    // Enum constructor (always private)
    CoffeeSize(int ounces, double price) {
        this.ounces = ounces;
        this.price = price;
    }

    // Getter methods
    public int getOunces() {
        return ounces;
    }

    public double getPrice() {
        return price;
    }
}

public class EnumWithFields {
    public static void main(String[] args) {
        // Access enum constant data
        CoffeeSize mySize = CoffeeSize.SMALL;

        System.out.println("Size: " + mySize);
        System.out.println("Ounces: " + mySize.getOunces());
        System.out.println("Price: $" + mySize.getPrice());


        // Print all sizes with details
        System.out.println("\nAll coffee sizes:");
        for (CoffeeSize size : CoffeeSize.values()) {
            System.out.printf("%s: %doz - $%.2f%n",
                size, size.getOunces(), size.getPrice());
        }

        // Calculate total for multiple coffees
        CoffeeSize[] order = {
            CoffeeSize.SMALL,
            CoffeeSize.MEDIUM,
            CoffeeSize.LARGE
        };

        double total = 0;
        System.out.println("\nOrder:");
        for (CoffeeSize size : order) {
            System.out.printf("  %s: $%.2f%n", size, size.getPrice());
            total += size.getPrice();
        }
        System.out.printf("Total: $%.2f%n", total);

    }
}
// Enum with fields and constructor
// Concept: enum fields - storing data in enum constants

enum CoffeeSize {
    SMALL(8, 2.50),
    MEDIUM(12, 3.00),
    LARGE(16, 3.50),
    EXTRA_LARGE(20, 4.00);

    private final int ounces;
    private final double price;

    // Enum constructor (always private)
    CoffeeSize(int ounces, double price) {
        this.ounces = ounces;
        this.price = price;
    }

    // Getter methods
    public int getOunces() {
        return ounces;
    }

    public double getPrice() {
        return price;
    }
}

public class EnumWithFields {
    public static void main(String[] args) {
        // Access enum constant data
        CoffeeSize mySize = CoffeeSize.LARGE;

        System.out.println("Size: " + mySize);
        System.out.println("Ounces: " + mySize.getOunces());
        System.out.println("Price: $" + mySize.getPrice());


        // Print all sizes with details
        System.out.println("\nAll coffee sizes:");
        for (CoffeeSize size : CoffeeSize.values()) {
            System.out.printf("%s: %doz - $%.2f%n",
                size, size.getOunces(), size.getPrice());
        }

        // Calculate total for multiple coffees
        CoffeeSize[] order = {
            CoffeeSize.SMALL,
            CoffeeSize.MEDIUM,
            CoffeeSize.LARGE
        };

        double total = 0;
        System.out.println("\nOrder:");
        for (CoffeeSize size : order) {
            System.out.printf("  %s: $%.2f%n", size, size.getPrice());
            total += size.getPrice();
        }
        System.out.printf("Total: $%.2f%n", total);

    }
}

                        
1public static void main(String[] args)⋯29public class EnumWithFields {30    public static void main(String[] args) {31        // Access enum constant data32        CoffeeSize mySize = CoffeeSize.MEDIUM;33        //@mySize=CoffeeSize.MEDIUM, CoffeeSize.SMALL, CoffeeSize.LARGE⋯
2this.ounces ← 8, this.price ← 2.5pass 1 of 4⋯13// Enum constructor (always private)14CoffeeSize(int ounces8, double price2.5) {15    this.ounces→ 8 = ounces8;16    this.price→ 2.5 = price2.5;17}⋯All 4 passes — pass 1 is the card abovepassouncespricethis.ouncesthis.price
182.582.5
2123.0123.0
3163.5163.5
4204.0204.0
3mySize ← MEDIUM⋯31// Access enum constant data32CoffeeSize mySize→ MEDIUM = CoffeeSize.MEDIUM;33//@mySize=CoffeeSize.MEDIUM, CoffeeSize.SMALL, CoffeeSize.LARGE3435System.out.println("Size: " + mySizeMEDIUM);36System.out.println("Ounces: " + mySize.getOunces());37System.out.println("Price: $" + mySize.getPrice());⋯outputSize: MEDIUM
4public int getOunces()pass 1 of 5⋯19// Getter methods20public int getOunces() {21    return ounces12;22}⋯All 5 passes — pass 1 is the card abovepassounces
112
28
312
416
520
5System.out.println("Ounces: " + mySize.getOunces());⋯35System.out.println("Size: " + mySize);36System.out.println("Ounces: " + mySize.getOunces());37System.out.println("Price: $" + mySize.getPrice());⋯outputOunces: 12
6public double getPrice()pass 1 of 11⋯24public double getPrice() {25    return price3.0;26}⋯All 11 passes — pass 1 is the card abovepassprice
13.0
22.5
33.0
43.5
54.0
62.5
72.5
83.0
93.0
103.5
113.5
7System.out.println("Price: $" + mySize.getPrice());⋯36System.out.println("Ounces: " + mySize.getOunces());37System.out.println("Price: $" + mySize.getPrice());3839//@help h140// Enum constructor is implicitly private41// Called once per constant when enum is loaded42// Cannot create new enum instances with 'new'43//@end4445// Print all sizes with details46System.out.println("\nAll coffee sizes:");47for (CoffeeSize size : CoffeeSize.values()) {⋯outputPrice: $3.0

All coffee sizes:
8for (CoffeeSize size : CoffeeSize.values())pass 1 of 4⋯46System.out.println("\nAll coffee sizes:");47for (CoffeeSize sizeSMALL : CoffeeSize.values()) {48    System.out.printf("%s: %doz - $%.2f%n", 49        sizeSMALL, size.getOunces(), size.getPrice());50}⋯All 4 passes — pass 1 is the card abovepasssize
1SMALL
2MEDIUM
3LARGE
4EXTRA_LARGE
9size, size.getOunces(), size.getPrice());⋯47for (CoffeeSize size : CoffeeSize.values()) {48    System.out.printf("%s: %doz - $%.2f%n", 49        sizeSMALL, size.getOunces(), size.getPrice());50}⋯
10size, size.getOunces(), size.getPrice());⋯47for (CoffeeSize size : CoffeeSize.values()) {48    System.out.printf("%s: %doz - $%.2f%n", 49        sizeMEDIUM, size.getOunces(), size.getPrice());50}⋯
11size, size.getOunces(), size.getPrice());⋯47for (CoffeeSize size : CoffeeSize.values()) {48    System.out.printf("%s: %doz - $%.2f%n", 49        sizeLARGE, size.getOunces(), size.getPrice());50}⋯
12size, size.getOunces(), size.getPrice());⋯47for (CoffeeSize size : CoffeeSize.values()) {48    System.out.printf("%s: %doz - $%.2f%n", 49        sizeEXTRA_LARGE, size.getOunces(), size.getPrice());50}⋯
13total ← 0.0⋯52// Calculate total for multiple coffees53CoffeeSize[] order = {54    CoffeeSize.SMALL,55    CoffeeSize.MEDIUM,56    CoffeeSize.LARGE57};5859double total→ 0.0 = 0;60System.out.println("\nOrder:");61for (CoffeeSize size : order) {⋯output
Order:
14for (CoffeeSize size : order)pass 1 of 3⋯60System.out.println("\nOrder:");61for (CoffeeSize sizeSMALL : order) {62    System.out.printf("  %s: $%.2f%n", sizeSMALL, size.getPrice());63    total += size.getPrice();⋯All 3 passes — pass 1 is the card abovepasssize
1SMALL
2MEDIUM
3LARGE
15System.out.printf("  %s: $%.2f%n", size, size.getPrice());⋯61for (CoffeeSize size : order) {62    System.out.printf("  %s: $%.2f%n", sizeSMALL, size.getPrice());63    total0.0 += size.getPrice();64}⋯
16total ← 2.5⋯62    System.out.printf("  %s: $%.2f%n", size, size.getPrice());63    total→ 2.5 += size.getPrice();64}⋯
17System.out.printf("  %s: $%.2f%n", size, size.getPrice());⋯61for (CoffeeSize size : order) {62    System.out.printf("  %s: $%.2f%n", sizeMEDIUM, size.getPrice());63    total2.5 += size.getPrice();64}⋯
18total ← 5.5⋯62    System.out.printf("  %s: $%.2f%n", size, size.getPrice());63    total→ 5.5 += size.getPrice();64}⋯
19System.out.printf("  %s: $%.2f%n", size, size.getPrice());⋯61for (CoffeeSize size : order) {62    System.out.printf("  %s: $%.2f%n", sizeLARGE, size.getPrice());63    total5.5 += size.getPrice();64}⋯
20total ← 9.0⋯62    System.out.printf("  %s: $%.2f%n", size, size.getPrice());63    total→ 9.0 += size.getPrice();64}⋯
21System.out.printf("Total: $%.2f%n", total);⋯64}65System.out.printf("Total: $%.2f%n", total9.0);⋯
1public static void main(String[] args)⋯29public class EnumWithFields {30    public static void main(String[] args) {31        // Access enum constant data32        CoffeeSize mySize = CoffeeSize.SMALL;⋯
2this.ounces ← 8, this.price ← 2.5pass 1 of 4⋯13// Enum constructor (always private)14CoffeeSize(int ounces8, double price2.5) {15    this.ounces→ 8 = ounces8;16    this.price→ 2.5 = price2.5;17}⋯All 4 passes — pass 1 is the card abovepassouncespricethis.ouncesthis.price
182.582.5
2123.0123.0
3163.5163.5
4204.0204.0
3mySize ← SMALL⋯31// Access enum constant data32CoffeeSize mySize→ SMALL = CoffeeSize.SMALL;3334System.out.println("Size: " + mySizeSMALL);35System.out.println("Ounces: " + mySize.getOunces());36System.out.println("Price: $" + mySize.getPrice());⋯outputSize: SMALL
4public int getOunces()pass 1 of 5⋯19// Getter methods20public int getOunces() {21    return ounces8;22}⋯All 5 passes — pass 1 is the card abovepassounces
18
28
312
416
520
5System.out.println("Ounces: " + mySize.getOunces());⋯34System.out.println("Size: " + mySize);35System.out.println("Ounces: " + mySize.getOunces());36System.out.println("Price: $" + mySize.getPrice());⋯outputOunces: 8
6public double getPrice()pass 1 of 11⋯24public double getPrice() {25    return price2.5;26}⋯All 11 passes — pass 1 is the card abovepassprice
12.5
22.5
33.0
43.5
54.0
62.5
72.5
83.0
93.0
103.5
113.5
7System.out.println("Price: $" + mySize.getPrice());⋯35System.out.println("Ounces: " + mySize.getOunces());36System.out.println("Price: $" + mySize.getPrice());373839// Print all sizes with details40System.out.println("\nAll coffee sizes:");41for (CoffeeSize size : CoffeeSize.values()) {⋯outputPrice: $2.5

All coffee sizes:
8for (CoffeeSize size : CoffeeSize.values())pass 1 of 4⋯40System.out.println("\nAll coffee sizes:");41for (CoffeeSize sizeSMALL : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeSMALL, size.getOunces(), size.getPrice());44}⋯All 4 passes — pass 1 is the card abovepasssize
1SMALL
2MEDIUM
3LARGE
4EXTRA_LARGE
9size, size.getOunces(), size.getPrice());⋯41for (CoffeeSize size : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeSMALL, size.getOunces(), size.getPrice());44}⋯
10size, size.getOunces(), size.getPrice());⋯41for (CoffeeSize size : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeMEDIUM, size.getOunces(), size.getPrice());44}⋯
11size, size.getOunces(), size.getPrice());⋯41for (CoffeeSize size : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeLARGE, size.getOunces(), size.getPrice());44}⋯
12size, size.getOunces(), size.getPrice());⋯41for (CoffeeSize size : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeEXTRA_LARGE, size.getOunces(), size.getPrice());44}⋯
13total ← 0.0⋯46// Calculate total for multiple coffees47CoffeeSize[] order = {48    CoffeeSize.SMALL,49    CoffeeSize.MEDIUM,50    CoffeeSize.LARGE51};5253double total→ 0.0 = 0;54System.out.println("\nOrder:");55for (CoffeeSize size : order) {⋯output
Order:
14for (CoffeeSize size : order)pass 1 of 3⋯54System.out.println("\nOrder:");55for (CoffeeSize sizeSMALL : order) {56    System.out.printf("  %s: $%.2f%n", sizeSMALL, size.getPrice());57    total += size.getPrice();⋯All 3 passes — pass 1 is the card abovepasssize
1SMALL
2MEDIUM
3LARGE
15System.out.printf("  %s: $%.2f%n", size, size.getPrice());⋯55for (CoffeeSize size : order) {56    System.out.printf("  %s: $%.2f%n", sizeSMALL, size.getPrice());57    total0.0 += size.getPrice();58}⋯
16total ← 2.5⋯56    System.out.printf("  %s: $%.2f%n", size, size.getPrice());57    total→ 2.5 += size.getPrice();58}⋯
17System.out.printf("  %s: $%.2f%n", size, size.getPrice());⋯55for (CoffeeSize size : order) {56    System.out.printf("  %s: $%.2f%n", sizeMEDIUM, size.getPrice());57    total2.5 += size.getPrice();58}⋯
18total ← 5.5⋯56    System.out.printf("  %s: $%.2f%n", size, size.getPrice());57    total→ 5.5 += size.getPrice();58}⋯
19System.out.printf("  %s: $%.2f%n", size, size.getPrice());⋯55for (CoffeeSize size : order) {56    System.out.printf("  %s: $%.2f%n", sizeLARGE, size.getPrice());57    total5.5 += size.getPrice();58}⋯
20total ← 9.0⋯56    System.out.printf("  %s: $%.2f%n", size, size.getPrice());57    total→ 9.0 += size.getPrice();58}⋯
21System.out.printf("Total: $%.2f%n", total);⋯58}59System.out.printf("Total: $%.2f%n", total9.0);⋯
1public static void main(String[] args)⋯29public class EnumWithFields {30    public static void main(String[] args) {31        // Access enum constant data32        CoffeeSize mySize = CoffeeSize.LARGE;⋯
2this.ounces ← 8, this.price ← 2.5pass 1 of 4⋯13// Enum constructor (always private)14CoffeeSize(int ounces8, double price2.5) {15    this.ounces→ 8 = ounces8;16    this.price→ 2.5 = price2.5;17}⋯All 4 passes — pass 1 is the card abovepassouncespricethis.ouncesthis.price
182.582.5
2123.0123.0
3163.5163.5
4204.0204.0
3mySize ← LARGE⋯31// Access enum constant data32CoffeeSize mySize→ LARGE = CoffeeSize.LARGE;3334System.out.println("Size: " + mySizeLARGE);35System.out.println("Ounces: " + mySize.getOunces());36System.out.println("Price: $" + mySize.getPrice());⋯outputSize: LARGE
4public int getOunces()pass 1 of 5⋯19// Getter methods20public int getOunces() {21    return ounces16;22}⋯All 5 passes — pass 1 is the card abovepassounces
116
28
312
416
520
5System.out.println("Ounces: " + mySize.getOunces());⋯34System.out.println("Size: " + mySize);35System.out.println("Ounces: " + mySize.getOunces());36System.out.println("Price: $" + mySize.getPrice());⋯outputOunces: 16
6public double getPrice()pass 1 of 11⋯24public double getPrice() {25    return price3.5;26}⋯All 11 passes — pass 1 is the card abovepassprice
13.5
22.5
33.0
43.5
54.0
62.5
72.5
83.0
93.0
103.5
113.5
7System.out.println("Price: $" + mySize.getPrice());⋯35System.out.println("Ounces: " + mySize.getOunces());36System.out.println("Price: $" + mySize.getPrice());373839// Print all sizes with details40System.out.println("\nAll coffee sizes:");41for (CoffeeSize size : CoffeeSize.values()) {⋯outputPrice: $3.5

All coffee sizes:
8for (CoffeeSize size : CoffeeSize.values())pass 1 of 4⋯40System.out.println("\nAll coffee sizes:");41for (CoffeeSize sizeSMALL : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeSMALL, size.getOunces(), size.getPrice());44}⋯All 4 passes — pass 1 is the card abovepasssize
1SMALL
2MEDIUM
3LARGE
4EXTRA_LARGE
9size, size.getOunces(), size.getPrice());⋯41for (CoffeeSize size : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeSMALL, size.getOunces(), size.getPrice());44}⋯
10size, size.getOunces(), size.getPrice());⋯41for (CoffeeSize size : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeMEDIUM, size.getOunces(), size.getPrice());44}⋯
11size, size.getOunces(), size.getPrice());⋯41for (CoffeeSize size : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeLARGE, size.getOunces(), size.getPrice());44}⋯
12size, size.getOunces(), size.getPrice());⋯41for (CoffeeSize size : CoffeeSize.values()) {42    System.out.printf("%s: %doz - $%.2f%n", 43        sizeEXTRA_LARGE, size.getOunces(), size.getPrice());44}⋯
13total ← 0.0⋯46// Calculate total for multiple coffees47CoffeeSize[] order = {48    CoffeeSize.SMALL,49    CoffeeSize.MEDIUM,50    CoffeeSize.LARGE51};5253double total→ 0.0 = 0;54System.out.println("\nOrder:");55for (CoffeeSize size : order) {⋯output
Order:
14for (CoffeeSize size : order)pass 1 of 3⋯54System.out.println("\nOrder:");55for (CoffeeSize sizeSMALL : order) {56    System.out.printf("  %s: $%.2f%n", sizeSMALL, size.getPrice());57    total += size.getPrice();⋯All 3 passes — pass 1 is the card abovepasssize
1SMALL
2MEDIUM
3LARGE
15System.out.printf("  %s: $%.2f%n", size, size.getPrice());⋯55for (CoffeeSize size : order) {56    System.out.printf("  %s: $%.2f%n", sizeSMALL, size.getPrice());57    total0.0 += size.getPrice();58}⋯
16total ← 2.5⋯56    System.out.printf("  %s: $%.2f%n", size, size.getPrice());57    total→ 2.5 += size.getPrice();58}⋯
17System.out.printf("  %s: $%.2f%n", size, size.getPrice());⋯55for (CoffeeSize size : order) {56    System.out.printf("  %s: $%.2f%n", sizeMEDIUM, size.getPrice());57    total2.5 += size.getPrice();58}⋯
18total ← 5.5⋯56    System.out.printf("  %s: $%.2f%n", size, size.getPrice());57    total→ 5.5 += size.getPrice();58}⋯
19System.out.printf("  %s: $%.2f%n", size, size.getPrice());⋯55for (CoffeeSize size : order) {56    System.out.printf("  %s: $%.2f%n", sizeLARGE, size.getPrice());57    total5.5 += size.getPrice();58}⋯
20total ← 9.0⋯56    System.out.printf("  %s: $%.2f%n", size, size.getPrice());57    total→ 9.0 += size.getPrice();58}⋯
21System.out.printf("Total: $%.2f%n", total);⋯58}59System.out.printf("Total: $%.2f%n", total9.0);⋯

All 4 passes — pass 1 is the card above
pass	`ounces`	`price`	`this.ounces`	`this.price`
1	8	2.5	8	2.5
2	12	3.0	12	3.0
3	16	3.5	16	3.5
4	20	4.0	20	4.0

All 5 passes — pass 1 is the card above
pass	`ounces`
1	12
2	8
3	12
4	16
5	20

All 11 passes — pass 1 is the card above
pass	`price`
1	3.0
2	2.5
3	3.0
4	3.5
5	4.0
6	2.5
7	2.5
8	3.0
9	3.0
10	3.5
11	3.5

All 4 passes — pass 1 is the card above
pass	`size`
1	SMALL
2	MEDIUM
3	LARGE
4	EXTRA_LARGE

All 3 passes — pass 1 is the card above
pass	`size`
1	SMALL
2	MEDIUM
3	LARGE

All 4 passes — pass 1 is the card above
pass	`ounces`	`price`	`this.ounces`	`this.price`
1	8	2.5	8	2.5
2	12	3.0	12	3.0
3	16	3.5	16	3.5
4	20	4.0	20	4.0

All 5 passes — pass 1 is the card above
pass	`ounces`
1	8
2	8
3	12
4	16
5	20

All 11 passes — pass 1 is the card above
pass	`price`
1	2.5
2	2.5
3	3.0
4	3.5
5	4.0
6	2.5
7	2.5
8	3.0
9	3.0
10	3.5
11	3.5

All 4 passes — pass 1 is the card above
pass	`size`
1	SMALL
2	MEDIUM
3	LARGE
4	EXTRA_LARGE

All 3 passes — pass 1 is the card above
pass	`size`
1	SMALL
2	MEDIUM
3	LARGE

All 4 passes — pass 1 is the card above
pass	`ounces`	`price`	`this.ounces`	`this.price`
1	8	2.5	8	2.5
2	12	3.0	12	3.0
3	16	3.5	16	3.5
4	20	4.0	20	4.0

All 5 passes — pass 1 is the card above
pass	`ounces`
1	16
2	8
3	12
4	16
5	20

All 11 passes — pass 1 is the card above
pass	`price`
1	3.5
2	2.5
3	3.0
4	3.5
5	4.0
6	2.5
7	2.5
8	3.0
9	3.0
10	3.5
11	3.5

All 4 passes — pass 1 is the card above
pass	`size`
1	SMALL
2	MEDIUM
3	LARGE
4	EXTRA_LARGE

All 3 passes — pass 1 is the card above
pass	`size`
1	SMALL
2	MEDIUM
3	LARGE

Constructor assigns values. Each constant has its own data.

enum fields Enums can have private final fields. Each constant stores its own values.

Enum methods

Add behavior to enums.

                            current
                            current = Temperature.MILD (default)current = Temperature.COLDcurrent = Temperature.HOT
                        

                            EnumMethods.java
                        
Replay: real traced execution (multi-file project)

                            // Enum with methods
// Concept: enum methods - behavior in enum constants

enum Temperature {
    FREEZING(32),
    COLD(50),
    MILD(65),
    WARM(75),
    HOT(90);

    private final int fahrenheit;

    Temperature(int fahrenheit) {
        this.fahrenheit = fahrenheit;
    }

    // Convert to Celsius
    public double toCelsius() {
        return (fahrenheit - 32) * 5.0 / 9.0;
    }

    // Get description
    public String getDescription() {
        return switch (this) {
            case FREEZING -> "Water freezes";
            case COLD -> "Wear a jacket";
            case MILD -> "Pleasant weather";
            case WARM -> "T-shirt weather";
            case HOT -> "Stay hydrated";
        };
    }

    // Check if comfortable
    public boolean isComfortable() {
        return fahrenheit >= 65 && fahrenheit <= 75;
    }

    public int getFahrenheit() {
        return fahrenheit;
    }
}

public class EnumMethods {
    public static void main(String[] args) {
        // Use enum methods
        Temperature current = Temperature.MILD;

        System.out.println("Temperature: " + current);
        System.out.println("Fahrenheit: " + current.getFahrenheit());
        System.out.println("Celsius: " + current.toCelsius());
        System.out.println("Description: " + current.getDescription());
        System.out.println("Comfortable? " + current.isComfortable());


        // Print all temperatures with conversions
        System.out.println("\nAll temperatures:");
        for (Temperature t : Temperature.values()) {
            System.out.printf("%s: %d°F = %.1f°C - %s%n",
                t,
                t.getFahrenheit(),
                t.toCelsius(),
                t.isComfortable() ? "✓" : "✗");
        }

        // Find comfortable temperatures
        System.out.println("\nComfortable temperatures:");
        for (Temperature t : Temperature.values()) {
            if (t.isComfortable()) {
                System.out.println("  " + t + ": " + t.getDescription());
            }
        }

        // Compare temperatures
        Temperature t1 = Temperature.COLD;
        Temperature t2 = Temperature.HOT;

        System.out.println("\nComparison:");
        System.out.printf("%s (%d°F) vs %s (%d°F)%n",
            t1, t1.getFahrenheit(),
            t2, t2.getFahrenheit());

        if (t1.getFahrenheit() < t2.getFahrenheit()) {
            System.out.println(t1 + " is cooler");
        }

    }
}
// Enum with methods
// Concept: enum methods - behavior in enum constants

enum Temperature {
    FREEZING(32),
    COLD(50),
    MILD(65),
    WARM(75),
    HOT(90);

    private final int fahrenheit;

    Temperature(int fahrenheit) {
        this.fahrenheit = fahrenheit;
    }

    // Convert to Celsius
    public double toCelsius() {
        return (fahrenheit - 32) * 5.0 / 9.0;
    }

    // Get description
    public String getDescription() {
        return switch (this) {
            case FREEZING -> "Water freezes";
            case COLD -> "Wear a jacket";
            case MILD -> "Pleasant weather";
            case WARM -> "T-shirt weather";
            case HOT -> "Stay hydrated";
        };
    }

    // Check if comfortable
    public boolean isComfortable() {
        return fahrenheit >= 65 && fahrenheit <= 75;
    }

    public int getFahrenheit() {
        return fahrenheit;
    }
}

public class EnumMethods {
    public static void main(String[] args) {
        // Use enum methods
        Temperature current = Temperature.COLD;

        System.out.println("Temperature: " + current);
        System.out.println("Fahrenheit: " + current.getFahrenheit());
        System.out.println("Celsius: " + current.toCelsius());
        System.out.println("Description: " + current.getDescription());
        System.out.println("Comfortable? " + current.isComfortable());


        // Print all temperatures with conversions
        System.out.println("\nAll temperatures:");
        for (Temperature t : Temperature.values()) {
            System.out.printf("%s: %d°F = %.1f°C - %s%n",
                t,
                t.getFahrenheit(),
                t.toCelsius(),
                t.isComfortable() ? "✓" : "✗");
        }

        // Find comfortable temperatures
        System.out.println("\nComfortable temperatures:");
        for (Temperature t : Temperature.values()) {
            if (t.isComfortable()) {
                System.out.println("  " + t + ": " + t.getDescription());
            }
        }

        // Compare temperatures
        Temperature t1 = Temperature.COLD;
        Temperature t2 = Temperature.HOT;

        System.out.println("\nComparison:");
        System.out.printf("%s (%d°F) vs %s (%d°F)%n",
            t1, t1.getFahrenheit(),
            t2, t2.getFahrenheit());

        if (t1.getFahrenheit() < t2.getFahrenheit()) {
            System.out.println(t1 + " is cooler");
        }

    }
}
// Enum with methods
// Concept: enum methods - behavior in enum constants

enum Temperature {
    FREEZING(32),
    COLD(50),
    MILD(65),
    WARM(75),
    HOT(90);

    private final int fahrenheit;

    Temperature(int fahrenheit) {
        this.fahrenheit = fahrenheit;
    }

    // Convert to Celsius
    public double toCelsius() {
        return (fahrenheit - 32) * 5.0 / 9.0;
    }

    // Get description
    public String getDescription() {
        return switch (this) {
            case FREEZING -> "Water freezes";
            case COLD -> "Wear a jacket";
            case MILD -> "Pleasant weather";
            case WARM -> "T-shirt weather";
            case HOT -> "Stay hydrated";
        };
    }

    // Check if comfortable
    public boolean isComfortable() {
        return fahrenheit >= 65 && fahrenheit <= 75;
    }

    public int getFahrenheit() {
        return fahrenheit;
    }
}

public class EnumMethods {
    public static void main(String[] args) {
        // Use enum methods
        Temperature current = Temperature.HOT;

        System.out.println("Temperature: " + current);
        System.out.println("Fahrenheit: " + current.getFahrenheit());
        System.out.println("Celsius: " + current.toCelsius());
        System.out.println("Description: " + current.getDescription());
        System.out.println("Comfortable? " + current.isComfortable());


        // Print all temperatures with conversions
        System.out.println("\nAll temperatures:");
        for (Temperature t : Temperature.values()) {
            System.out.printf("%s: %d°F = %.1f°C - %s%n",
                t,
                t.getFahrenheit(),
                t.toCelsius(),
                t.isComfortable() ? "✓" : "✗");
        }

        // Find comfortable temperatures
        System.out.println("\nComfortable temperatures:");
        for (Temperature t : Temperature.values()) {
            if (t.isComfortable()) {
                System.out.println("  " + t + ": " + t.getDescription());
            }
        }

        // Compare temperatures
        Temperature t1 = Temperature.COLD;
        Temperature t2 = Temperature.HOT;

        System.out.println("\nComparison:");
        System.out.printf("%s (%d°F) vs %s (%d°F)%n",
            t1, t1.getFahrenheit(),
            t2, t2.getFahrenheit());

        if (t1.getFahrenheit() < t2.getFahrenheit()) {
            System.out.println(t1 + " is cooler");
        }

    }
}

                        
1public static void main(String[] args)⋯43public class EnumMethods {44    public static void main(String[] args) {45        // Use enum methods46        Temperature current = Temperature.MILD;47        //@current=Temperature.MILD, Temperature.COLD, Temperature.HOT⋯
2this.fahrenheit ← 32pass 1 of 5⋯13Temperature(int fahrenheit32) {14    this.fahrenheit→ 32 = fahrenheit32;15}⋯All 5 passes — pass 1 is the card abovepassfahrenheitthis.fahrenheit
13232
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36565
47575
59090
3current ← MILD⋯45// Use enum methods46Temperature current→ MILD = Temperature.MILD;47//@current=Temperature.MILD, Temperature.COLD, Temperature.HOT4849System.out.println("Temperature: " + currentMILD);50System.out.println("Fahrenheit: " + current.getFahrenheit());51System.out.println("Celsius: " + current.toCelsius());⋯outputTemperature: MILD
4public int getFahrenheit()pass 1 of 10⋯38public int getFahrenheit() {39    return fahrenheit65;40}⋯All 10 passes — pass 1 is the card abovepassfahrenheitt1
165—
232—
350—
465—
575—
690—
750—
890—
950—
1090COLD
5System.out.println("Fahrenheit: " + current.getFahrenheit());⋯49System.out.println("Temperature: " + current);50System.out.println("Fahrenheit: " + current.getFahrenheit());51System.out.println("Celsius: " + current.toCelsius());52System.out.println("Description: " + current.getDescription());⋯outputFahrenheit: 65
6public double toCelsius()pass 1 of 6⋯17// Convert to Celsius18public double toCelsius() {19    return (fahrenheit65 - 32) * 5.0 / 9.0;20}⋯All 6 passes — pass 1 is the card abovepassfahrenheit
165
232
350
465
575
690
7System.out.println("Celsius: " + current.toCelsius());⋯50System.out.println("Fahrenheit: " + current.getFahrenheit());51System.out.println("Celsius: " + current.toCelsius());52System.out.println("Description: " + current.getDescription());53System.out.println("Comfortable? " + current.isComfortable());⋯outputCelsius: 18.333333333333332
8System.out.println("Description: " + current.getDescription());⋯51System.out.println("Celsius: " + current.toCelsius());52System.out.println("Description: " + current.getDescription());53System.out.println("Comfortable? " + current.isComfortable());⋯outputDescription: Pleasant weather
9public boolean isComfortable()pass 1 of 11⋯33// Check if comfortable34public boolean isComfortable() {35    return fahrenheit65 >= 65 && fahrenheit <= 75;36}⋯All 11 passes — pass 1 is the card abovepassfahrenheitt
165—
232—
350—
465—
575—
690—
732—
850—
965MILD
1075WARM
1190—
10System.out.println("Comfortable? " + current.isComfortable());⋯52System.out.println("Description: " + current.getDescription());53System.out.println("Comfortable? " + current.isComfortable());5455//@help h156// Enum methods can access the enum's fields57// Can use 'this' to refer to current constant58// Methods work just like class methods59//@end6061// Print all temperatures with conversions62System.out.println("\nAll temperatures:");63for (Temperature t : Temperature.values()) {⋯outputComfortable? true

All temperatures:
11for (Temperature t : Temperature.values())pass 1 of 5⋯62System.out.println("\nAll temperatures:");63for (Temperature tFREEZING : Temperature.values()) {64    System.out.printf("%s: %d°F = %.1f°C - %s%n",65        tFREEZING, 66        t.getFahrenheit(),67        t.toCelsius(),68        t.isComfortable() ? "✓" : "✗");69}⋯All 5 passes — pass 1 is the card abovepasst
1FREEZING
2COLD
3MILD
4WARM
5HOT
12t,⋯63for (Temperature t : Temperature.values()) {64    System.out.printf("%s: %d°F = %.1f°C - %s%n",65        tFREEZING, 66        t.getFahrenheit(),67        t.toCelsius(),68        t.isComfortable() ? "✓" : "✗");69}⋯
13t,⋯63for (Temperature t : Temperature.values()) {64    System.out.printf("%s: %d°F = %.1f°C - %s%n",65        tCOLD, 66        t.getFahrenheit(),67        t.toCelsius(),68        t.isComfortable() ? "✓" : "✗");69}⋯
14t,⋯63for (Temperature t : Temperature.values()) {64    System.out.printf("%s: %d°F = %.1f°C - %s%n",65        tMILD, 66        t.getFahrenheit(),67        t.toCelsius(),68        t.isComfortable() ? "✓" : "✗");69}⋯
15t,⋯63for (Temperature t : Temperature.values()) {64    System.out.printf("%s: %d°F = %.1f°C - %s%n",65        tWARM, 66        t.getFahrenheit(),67        t.toCelsius(),68        t.isComfortable() ? "✓" : "✗");69}⋯
16t,⋯63for (Temperature t : Temperature.values()) {64    System.out.printf("%s: %d°F = %.1f°C - %s%n",65        tHOT, 66        t.getFahrenheit(),67        t.toCelsius(),68        t.isComfortable() ? "✓" : "✗");69}⋯
17System.out.println(" Comfortable temperatures:");⋯71// Find comfortable temperatures72System.out.println("\nComfortable temperatures:");73for (Temperature t : Temperature.values()) {⋯output
Comfortable temperatures:
18for (Temperature t : Temperature.values())pass 1 of 5⋯72System.out.println("\nComfortable temperatures:");73for (Temperature tFREEZING : Temperature.values()) {74    if (t.isComfortable()) {⋯All 5 passes — pass 1 is the card abovepasst
1FREEZING
2COLD
3MILD
4WARM
5HOT
19if (t.isComfortable())pass 1 of 2⋯73for (Temperature t : Temperature.values()) {74    if (t.isComfortable()) {75        System.out.println("  " + tMILD + ": " + t.getDescription());76    }⋯
20System.out.println("  " + t + ": " + t.getDescription());⋯74if (t.isComfortable()) {75    System.out.println("  " + tMILD + ": " + t.getDescription());76}⋯output  MILD: Pleasant weather
21if (t.isComfortable())pass 2 of 2⋯73for (Temperature t : Temperature.values()) {74    if (t.isComfortable()) {75        System.out.println("  " + tWARM + ": " + t.getDescription());76    }⋯
22System.out.println("  " + t + ": " + t.getDescription());⋯74if (t.isComfortable()) {75    System.out.println("  " + tWARM + ": " + t.getDescription());76}⋯output  WARM: T-shirt weather
23t1 ← COLD, t2 ← HOT⋯79// Compare temperatures80Temperature t1→ COLD = Temperature.COLD;81Temperature t2→ HOT = Temperature.HOT;8283System.out.println("\nComparison:");84System.out.printf("%s (%d°F) vs %s (%d°F)%n",85    t1COLD, t1.getFahrenheit(),86    t2HOT, t2.getFahrenheit());⋯output
Comparison:
24t1, t1.getFahrenheit(),⋯83System.out.println("\nComparison:");84System.out.printf("%s (%d°F) vs %s (%d°F)%n",85    t1COLD, t1.getFahrenheit(),86    t2HOT, t2.getFahrenheit());⋯
25if (t1.getFahrenheit() < t2.getFahrenheit())⋯88if (t1.getFahrenheit() < t2.getFahrenheit()) {89    System.out.println(t1COLD + " is cooler");90}⋯outputCOLD is cooler
1public static void main(String[] args)⋯43public class EnumMethods {44    public static void main(String[] args) {45        // Use enum methods46        Temperature current = Temperature.COLD;⋯
2this.fahrenheit ← 32pass 1 of 5⋯13Temperature(int fahrenheit32) {14    this.fahrenheit→ 32 = fahrenheit32;15}⋯All 5 passes — pass 1 is the card abovepassfahrenheitthis.fahrenheit
13232
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36565
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59090
3current ← COLD⋯45// Use enum methods46Temperature current→ COLD = Temperature.COLD;4748System.out.println("Temperature: " + currentCOLD);49System.out.println("Fahrenheit: " + current.getFahrenheit());50System.out.println("Celsius: " + current.toCelsius());⋯outputTemperature: COLD
4public int getFahrenheit()pass 1 of 10⋯38public int getFahrenheit() {39    return fahrenheit50;40}⋯All 10 passes — pass 1 is the card abovepassfahrenheitt1
150—
232—
350—
465—
575—
690—
750—
890—
950—
1090COLD
5System.out.println("Fahrenheit: " + current.getFahrenheit());⋯48System.out.println("Temperature: " + current);49System.out.println("Fahrenheit: " + current.getFahrenheit());50System.out.println("Celsius: " + current.toCelsius());51System.out.println("Description: " + current.getDescription());⋯outputFahrenheit: 50
6public double toCelsius()pass 1 of 6⋯17// Convert to Celsius18public double toCelsius() {19    return (fahrenheit50 - 32) * 5.0 / 9.0;20}⋯All 6 passes — pass 1 is the card abovepassfahrenheit
150
232
350
465
575
690
7System.out.println("Celsius: " + current.toCelsius());⋯49System.out.println("Fahrenheit: " + current.getFahrenheit());50System.out.println("Celsius: " + current.toCelsius());51System.out.println("Description: " + current.getDescription());52System.out.println("Comfortable? " + current.isComfortable());⋯outputCelsius: 10.0
8System.out.println("Description: " + current.getDescription());⋯50System.out.println("Celsius: " + current.toCelsius());51System.out.println("Description: " + current.getDescription());52System.out.println("Comfortable? " + current.isComfortable());⋯outputDescription: Wear a jacket
9public boolean isComfortable()pass 1 of 11⋯33// Check if comfortable34public boolean isComfortable() {35    return fahrenheit50 >= 65 && fahrenheit <= 75;36}⋯All 11 passes — pass 1 is the card abovepassfahrenheitt
150—
232—
350—
465—
575—
690—
732—
850—
965MILD
1075WARM
1190—
10System.out.println("Comfortable? " + current.isComfortable());⋯51System.out.println("Description: " + current.getDescription());52System.out.println("Comfortable? " + current.isComfortable());535455// Print all temperatures with conversions56System.out.println("\nAll temperatures:");57for (Temperature t : Temperature.values()) {⋯outputComfortable? false

All temperatures:
11for (Temperature t : Temperature.values())pass 1 of 5⋯56System.out.println("\nAll temperatures:");57for (Temperature tFREEZING : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tFREEZING, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯All 5 passes — pass 1 is the card abovepasst
1FREEZING
2COLD
3MILD
4WARM
5HOT
12t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tFREEZING, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
13t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tCOLD, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
14t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tMILD, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
15t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tWARM, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
16t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tHOT, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
17System.out.println(" Comfortable temperatures:");⋯65// Find comfortable temperatures66System.out.println("\nComfortable temperatures:");67for (Temperature t : Temperature.values()) {⋯output
Comfortable temperatures:
18for (Temperature t : Temperature.values())pass 1 of 5⋯66System.out.println("\nComfortable temperatures:");67for (Temperature tFREEZING : Temperature.values()) {68    if (t.isComfortable()) {⋯All 5 passes — pass 1 is the card abovepasst
1FREEZING
2COLD
3MILD
4WARM
5HOT
19if (t.isComfortable())pass 1 of 2⋯67for (Temperature t : Temperature.values()) {68    if (t.isComfortable()) {69        System.out.println("  " + tMILD + ": " + t.getDescription());70    }⋯
20System.out.println("  " + t + ": " + t.getDescription());⋯68if (t.isComfortable()) {69    System.out.println("  " + tMILD + ": " + t.getDescription());70}⋯output  MILD: Pleasant weather
21if (t.isComfortable())pass 2 of 2⋯67for (Temperature t : Temperature.values()) {68    if (t.isComfortable()) {69        System.out.println("  " + tWARM + ": " + t.getDescription());70    }⋯
22System.out.println("  " + t + ": " + t.getDescription());⋯68if (t.isComfortable()) {69    System.out.println("  " + tWARM + ": " + t.getDescription());70}⋯output  WARM: T-shirt weather
23t1 ← COLD, t2 ← HOT⋯73// Compare temperatures74Temperature t1→ COLD = Temperature.COLD;75Temperature t2→ HOT = Temperature.HOT;7677System.out.println("\nComparison:");78System.out.printf("%s (%d°F) vs %s (%d°F)%n",79    t1COLD, t1.getFahrenheit(),80    t2HOT, t2.getFahrenheit());⋯output
Comparison:
24t1, t1.getFahrenheit(),⋯77System.out.println("\nComparison:");78System.out.printf("%s (%d°F) vs %s (%d°F)%n",79    t1COLD, t1.getFahrenheit(),80    t2HOT, t2.getFahrenheit());⋯
25if (t1.getFahrenheit() < t2.getFahrenheit())⋯82if (t1.getFahrenheit() < t2.getFahrenheit()) {83    System.out.println(t1COLD + " is cooler");84}⋯outputCOLD is cooler
1public static void main(String[] args)⋯43public class EnumMethods {44    public static void main(String[] args) {45        // Use enum methods46        Temperature current = Temperature.HOT;⋯
2this.fahrenheit ← 32pass 1 of 5⋯13Temperature(int fahrenheit32) {14    this.fahrenheit→ 32 = fahrenheit32;15}⋯All 5 passes — pass 1 is the card abovepassfahrenheitthis.fahrenheit
13232
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36565
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3current ← HOT⋯45// Use enum methods46Temperature current→ HOT = Temperature.HOT;4748System.out.println("Temperature: " + currentHOT);49System.out.println("Fahrenheit: " + current.getFahrenheit());50System.out.println("Celsius: " + current.toCelsius());⋯outputTemperature: HOT
4public int getFahrenheit()pass 1 of 10⋯38public int getFahrenheit() {39    return fahrenheit90;40}⋯All 10 passes — pass 1 is the card abovepassfahrenheitt1
190—
232—
350—
465—
575—
690—
750—
890—
950—
1090COLD
5System.out.println("Fahrenheit: " + current.getFahrenheit());⋯48System.out.println("Temperature: " + current);49System.out.println("Fahrenheit: " + current.getFahrenheit());50System.out.println("Celsius: " + current.toCelsius());51System.out.println("Description: " + current.getDescription());⋯outputFahrenheit: 90
6public double toCelsius()pass 1 of 6⋯17// Convert to Celsius18public double toCelsius() {19    return (fahrenheit90 - 32) * 5.0 / 9.0;20}⋯All 6 passes — pass 1 is the card abovepassfahrenheit
190
232
350
465
575
690
7System.out.println("Celsius: " + current.toCelsius());⋯49System.out.println("Fahrenheit: " + current.getFahrenheit());50System.out.println("Celsius: " + current.toCelsius());51System.out.println("Description: " + current.getDescription());52System.out.println("Comfortable? " + current.isComfortable());⋯outputCelsius: 32.22222222222222
8System.out.println("Description: " + current.getDescription());⋯50System.out.println("Celsius: " + current.toCelsius());51System.out.println("Description: " + current.getDescription());52System.out.println("Comfortable? " + current.isComfortable());⋯outputDescription: Stay hydrated
9public boolean isComfortable()pass 1 of 11⋯33// Check if comfortable34public boolean isComfortable() {35    return fahrenheit90 >= 65 && fahrenheit <= 75;36}⋯All 11 passes — pass 1 is the card abovepassfahrenheitt
190—
232—
350—
465—
575—
690—
732—
850—
965MILD
1075WARM
1190—
10System.out.println("Comfortable? " + current.isComfortable());⋯51System.out.println("Description: " + current.getDescription());52System.out.println("Comfortable? " + current.isComfortable());535455// Print all temperatures with conversions56System.out.println("\nAll temperatures:");57for (Temperature t : Temperature.values()) {⋯outputComfortable? false

All temperatures:
11for (Temperature t : Temperature.values())pass 1 of 5⋯56System.out.println("\nAll temperatures:");57for (Temperature tFREEZING : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tFREEZING, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯All 5 passes — pass 1 is the card abovepasst
1FREEZING
2COLD
3MILD
4WARM
5HOT
12t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tFREEZING, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
13t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tCOLD, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
14t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tMILD, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
15t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tWARM, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
16t,⋯57for (Temperature t : Temperature.values()) {58    System.out.printf("%s: %d°F = %.1f°C - %s%n",59        tHOT, 60        t.getFahrenheit(),61        t.toCelsius(),62        t.isComfortable() ? "✓" : "✗");63}⋯
17System.out.println(" Comfortable temperatures:");⋯65// Find comfortable temperatures66System.out.println("\nComfortable temperatures:");67for (Temperature t : Temperature.values()) {⋯output
Comfortable temperatures:
18for (Temperature t : Temperature.values())pass 1 of 5⋯66System.out.println("\nComfortable temperatures:");67for (Temperature tFREEZING : Temperature.values()) {68    if (t.isComfortable()) {⋯All 5 passes — pass 1 is the card abovepasst
1FREEZING
2COLD
3MILD
4WARM
5HOT
19if (t.isComfortable())pass 1 of 2⋯67for (Temperature t : Temperature.values()) {68    if (t.isComfortable()) {69        System.out.println("  " + tMILD + ": " + t.getDescription());70    }⋯
20System.out.println("  " + t + ": " + t.getDescription());⋯68if (t.isComfortable()) {69    System.out.println("  " + tMILD + ": " + t.getDescription());70}⋯output  MILD: Pleasant weather
21if (t.isComfortable())pass 2 of 2⋯67for (Temperature t : Temperature.values()) {68    if (t.isComfortable()) {69        System.out.println("  " + tWARM + ": " + t.getDescription());70    }⋯
22System.out.println("  " + t + ": " + t.getDescription());⋯68if (t.isComfortable()) {69    System.out.println("  " + tWARM + ": " + t.getDescription());70}⋯output  WARM: T-shirt weather
23t1 ← COLD, t2 ← HOT⋯73// Compare temperatures74Temperature t1→ COLD = Temperature.COLD;75Temperature t2→ HOT = Temperature.HOT;7677System.out.println("\nComparison:");78System.out.printf("%s (%d°F) vs %s (%d°F)%n",79    t1COLD, t1.getFahrenheit(),80    t2HOT, t2.getFahrenheit());⋯output
Comparison:
24t1, t1.getFahrenheit(),⋯77System.out.println("\nComparison:");78System.out.printf("%s (%d°F) vs %s (%d°F)%n",79    t1COLD, t1.getFahrenheit(),80    t2HOT, t2.getFahrenheit());⋯
25if (t1.getFahrenheit() < t2.getFahrenheit())⋯82if (t1.getFahrenheit() < t2.getFahrenheit()) {83    System.out.println(t1COLD + " is cooler");84}⋯outputCOLD is cooler

All 5 passes — pass 1 is the card above
pass	`fahrenheit`	`this.fahrenheit`
1	32	32
2	50	50
3	65	65
4	75	75
5	90	90

All 10 passes — pass 1 is the card above
pass	`fahrenheit`	`t1`
1	65	—
2	32	—
3	50	—
4	65	—
5	75	—
6	90	—
7	50	—
8	90	—
9	50	—
10	90	COLD

All 6 passes — pass 1 is the card above
pass	`fahrenheit`
1	65
2	32
3	50
4	65
5	75
6	90

All 11 passes — pass 1 is the card above
pass	`fahrenheit`	`t`
1	65	—
2	32	—
3	50	—
4	65	—
5	75	—
6	90	—
7	32	—
8	50	—
9	65	MILD
10	75	WARM
11	90	—

All 5 passes — pass 1 is the card above
pass	`t`
1	FREEZING
2	COLD
3	MILD
4	WARM
5	HOT

All 5 passes — pass 1 is the card above
pass	`t`
1	FREEZING
2	COLD
3	MILD
4	WARM
5	HOT

All 5 passes — pass 1 is the card above
pass	`fahrenheit`	`this.fahrenheit`
1	32	32
2	50	50
3	65	65
4	75	75
5	90	90

All 10 passes — pass 1 is the card above
pass	`fahrenheit`	`t1`
1	50	—
2	32	—
3	50	—
4	65	—
5	75	—
6	90	—
7	50	—
8	90	—
9	50	—
10	90	COLD

All 6 passes — pass 1 is the card above
pass	`fahrenheit`
1	50
2	32
3	50
4	65
5	75
6	90

All 11 passes — pass 1 is the card above
pass	`fahrenheit`	`t`
1	50	—
2	32	—
3	50	—
4	65	—
5	75	—
6	90	—
7	32	—
8	50	—
9	65	MILD
10	75	WARM
11	90	—

All 5 passes — pass 1 is the card above
pass	`t`
1	FREEZING
2	COLD
3	MILD
4	WARM
5	HOT

All 5 passes — pass 1 is the card above
pass	`t`
1	FREEZING
2	COLD
3	MILD
4	WARM
5	HOT

All 5 passes — pass 1 is the card above
pass	`fahrenheit`	`this.fahrenheit`
1	32	32
2	50	50
3	65	65
4	75	75
5	90	90

All 10 passes — pass 1 is the card above
pass	`fahrenheit`	`t1`
1	90	—
2	32	—
3	50	—
4	65	—
5	75	—
6	90	—
7	50	—
8	90	—
9	50	—
10	90	COLD

All 6 passes — pass 1 is the card above
pass	`fahrenheit`
1	90
2	32
3	50
4	65
5	75
6	90

All 11 passes — pass 1 is the card above
pass	`fahrenheit`	`t`
1	90	—
2	32	—
3	50	—
4	65	—
5	75	—
6	90	—
7	32	—
8	50	—
9	65	MILD
10	75	WARM
11	90	—

All 5 passes — pass 1 is the card above
pass	`t`
1	FREEZING
2	COLD
3	MILD
4	WARM
5	HOT

All 5 passes — pass 1 is the card above
pass	`t`
1	FREEZING
2	COLD
3	MILD
4	WARM
5	HOT

Regular methods work with enum's fields. All constants share the method.

Complex enum

Full-featured enum with multiple fields and methods.

                            example
                            packageWeight = 10.0, weight = 5.0 (default)packageWeight = 20.0packageWeight = 60.0weight = 15.0
                        

                            ComplexEnum.java
                        
Replay: real traced execution (multi-file project)

                            // Enum with multiple fields and complex logic
// Concept: complex enum - multiple fields and calculations

enum ShippingMethod {
    STANDARD(5.99, 5, "5-7 business days"),
    EXPRESS(12.99, 2, "2-3 business days"),
    OVERNIGHT(24.99, 1, "Next business day"),
    INTERNATIONAL(35.00, 10, "7-14 business days");

    private final double baseCost;
    private final int daysMin;
    private final String description;

    ShippingMethod(double baseCost, int daysMin, String description) {
        this.baseCost = baseCost;
        this.daysMin = daysMin;
        this.description = description;
    }

    // Calculate cost with weight
    public double calculateCost(double weightPounds) {
        if (this == INTERNATIONAL) {
            return baseCost + (weightPounds * 2.50);
        } else if (this == OVERNIGHT) {
            return baseCost + (weightPounds * 1.50);
        } else {
            return baseCost + (weightPounds * 0.50);
        }
    }

    // Check if available for weight
    public boolean isAvailableFor(double weightPounds) {
        if (this == OVERNIGHT && weightPounds > 50) {
            return false;  // Overnight has weight limit
        }
        return true;
    }

    public double getBaseCost() { return baseCost; }
    public String getDescription() { return description; }
    public int getDaysMin() { return daysMin; }
}

public class ComplexEnum {
    public static void main(String[] args) {
        // Calculate shipping for different weights
        double packageWeight = 10.0;

        System.out.println("Package weight: " + packageWeight + " lbs\n");
        System.out.println("Shipping options:");

        for (ShippingMethod method : ShippingMethod.values()) {
            if (method.isAvailableFor(packageWeight)) {
                double cost = method.calculateCost(packageWeight);
                System.out.printf("%s: $%.2f (%s)%n",
                    method, cost, method.getDescription());
            } else {
                System.out.printf("%s: Not available for this weight%n", method);
            }
        }


        // Find cheapest option
        double weight = 5.0;
        ShippingMethod cheapest = ShippingMethod.STANDARD;
        double lowestCost = cheapest.calculateCost(weight);

        for (ShippingMethod method : ShippingMethod.values()) {
            if (method.isAvailableFor(weight)) {
                double cost = method.calculateCost(weight);
                if (cost < lowestCost) {
                    cheapest = method;
                    lowestCost = cost;
                }
            }
        }

        System.out.printf("\nFor %.1f lbs, cheapest: %s ($%.2f)%n",
            weight, cheapest, lowestCost);

        // Find fastest under budget
        double budget = 15.00;
        ShippingMethod fastest = null;

        for (ShippingMethod method : ShippingMethod.values()) {
            double cost = method.calculateCost(weight);
            if (cost <= budget) {
                if (fastest == null || method.getDaysMin() < fastest.getDaysMin()) {
                    fastest = method;
                }
            }
        }

        if (fastest != null) {
            System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",
                budget, fastest,
                (double)fastest.getDaysMin(),
                fastest.calculateCost(weight));
        }

    }
}
// Enum with multiple fields and complex logic
// Concept: complex enum - multiple fields and calculations

enum ShippingMethod {
    STANDARD(5.99, 5, "5-7 business days"),
    EXPRESS(12.99, 2, "2-3 business days"),
    OVERNIGHT(24.99, 1, "Next business day"),
    INTERNATIONAL(35.00, 10, "7-14 business days");

    private final double baseCost;
    private final int daysMin;
    private final String description;

    ShippingMethod(double baseCost, int daysMin, String description) {
        this.baseCost = baseCost;
        this.daysMin = daysMin;
        this.description = description;
    }

    // Calculate cost with weight
    public double calculateCost(double weightPounds) {
        if (this == INTERNATIONAL) {
            return baseCost + (weightPounds * 2.50);
        } else if (this == OVERNIGHT) {
            return baseCost + (weightPounds * 1.50);
        } else {
            return baseCost + (weightPounds * 0.50);
        }
    }

    // Check if available for weight
    public boolean isAvailableFor(double weightPounds) {
        if (this == OVERNIGHT && weightPounds > 50) {
            return false;  // Overnight has weight limit
        }
        return true;
    }

    public double getBaseCost() { return baseCost; }
    public String getDescription() { return description; }
    public int getDaysMin() { return daysMin; }
}

public class ComplexEnum {
    public static void main(String[] args) {
        // Calculate shipping for different weights
        double packageWeight = 20.0;

        System.out.println("Package weight: " + packageWeight + " lbs\n");
        System.out.println("Shipping options:");

        for (ShippingMethod method : ShippingMethod.values()) {
            if (method.isAvailableFor(packageWeight)) {
                double cost = method.calculateCost(packageWeight);
                System.out.printf("%s: $%.2f (%s)%n",
                    method, cost, method.getDescription());
            } else {
                System.out.printf("%s: Not available for this weight%n", method);
            }
        }


        // Find cheapest option
        double weight = 5.0;
        ShippingMethod cheapest = ShippingMethod.STANDARD;
        double lowestCost = cheapest.calculateCost(weight);

        for (ShippingMethod method : ShippingMethod.values()) {
            if (method.isAvailableFor(weight)) {
                double cost = method.calculateCost(weight);
                if (cost < lowestCost) {
                    cheapest = method;
                    lowestCost = cost;
                }
            }
        }

        System.out.printf("\nFor %.1f lbs, cheapest: %s ($%.2f)%n",
            weight, cheapest, lowestCost);

        // Find fastest under budget
        double budget = 15.00;
        ShippingMethod fastest = null;

        for (ShippingMethod method : ShippingMethod.values()) {
            double cost = method.calculateCost(weight);
            if (cost <= budget) {
                if (fastest == null || method.getDaysMin() < fastest.getDaysMin()) {
                    fastest = method;
                }
            }
        }

        if (fastest != null) {
            System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",
                budget, fastest,
                (double)fastest.getDaysMin(),
                fastest.calculateCost(weight));
        }

    }
}
// Enum with multiple fields and complex logic
// Concept: complex enum - multiple fields and calculations

enum ShippingMethod {
    STANDARD(5.99, 5, "5-7 business days"),
    EXPRESS(12.99, 2, "2-3 business days"),
    OVERNIGHT(24.99, 1, "Next business day"),
    INTERNATIONAL(35.00, 10, "7-14 business days");

    private final double baseCost;
    private final int daysMin;
    private final String description;

    ShippingMethod(double baseCost, int daysMin, String description) {
        this.baseCost = baseCost;
        this.daysMin = daysMin;
        this.description = description;
    }

    // Calculate cost with weight
    public double calculateCost(double weightPounds) {
        if (this == INTERNATIONAL) {
            return baseCost + (weightPounds * 2.50);
        } else if (this == OVERNIGHT) {
            return baseCost + (weightPounds * 1.50);
        } else {
            return baseCost + (weightPounds * 0.50);
        }
    }

    // Check if available for weight
    public boolean isAvailableFor(double weightPounds) {
        if (this == OVERNIGHT && weightPounds > 50) {
            return false;  // Overnight has weight limit
        }
        return true;
    }

    public double getBaseCost() { return baseCost; }
    public String getDescription() { return description; }
    public int getDaysMin() { return daysMin; }
}

public class ComplexEnum {
    public static void main(String[] args) {
        // Calculate shipping for different weights
        double packageWeight = 60.0;

        System.out.println("Package weight: " + packageWeight + " lbs\n");
        System.out.println("Shipping options:");

        for (ShippingMethod method : ShippingMethod.values()) {
            if (method.isAvailableFor(packageWeight)) {
                double cost = method.calculateCost(packageWeight);
                System.out.printf("%s: $%.2f (%s)%n",
                    method, cost, method.getDescription());
            } else {
                System.out.printf("%s: Not available for this weight%n", method);
            }
        }


        // Find cheapest option
        double weight = 5.0;
        ShippingMethod cheapest = ShippingMethod.STANDARD;
        double lowestCost = cheapest.calculateCost(weight);

        for (ShippingMethod method : ShippingMethod.values()) {
            if (method.isAvailableFor(weight)) {
                double cost = method.calculateCost(weight);
                if (cost < lowestCost) {
                    cheapest = method;
                    lowestCost = cost;
                }
            }
        }

        System.out.printf("\nFor %.1f lbs, cheapest: %s ($%.2f)%n",
            weight, cheapest, lowestCost);

        // Find fastest under budget
        double budget = 15.00;
        ShippingMethod fastest = null;

        for (ShippingMethod method : ShippingMethod.values()) {
            double cost = method.calculateCost(weight);
            if (cost <= budget) {
                if (fastest == null || method.getDaysMin() < fastest.getDaysMin()) {
                    fastest = method;
                }
            }
        }

        if (fastest != null) {
            System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",
                budget, fastest,
                (double)fastest.getDaysMin(),
                fastest.calculateCost(weight));
        }

    }
}
// Enum with multiple fields and complex logic
// Concept: complex enum - multiple fields and calculations

enum ShippingMethod {
    STANDARD(5.99, 5, "5-7 business days"),
    EXPRESS(12.99, 2, "2-3 business days"),
    OVERNIGHT(24.99, 1, "Next business day"),
    INTERNATIONAL(35.00, 10, "7-14 business days");

    private final double baseCost;
    private final int daysMin;
    private final String description;

    ShippingMethod(double baseCost, int daysMin, String description) {
        this.baseCost = baseCost;
        this.daysMin = daysMin;
        this.description = description;
    }

    // Calculate cost with weight
    public double calculateCost(double weightPounds) {
        if (this == INTERNATIONAL) {
            return baseCost + (weightPounds * 2.50);
        } else if (this == OVERNIGHT) {
            return baseCost + (weightPounds * 1.50);
        } else {
            return baseCost + (weightPounds * 0.50);
        }
    }

    // Check if available for weight
    public boolean isAvailableFor(double weightPounds) {
        if (this == OVERNIGHT && weightPounds > 50) {
            return false;  // Overnight has weight limit
        }
        return true;
    }

    public double getBaseCost() { return baseCost; }
    public String getDescription() { return description; }
    public int getDaysMin() { return daysMin; }
}

public class ComplexEnum {
    public static void main(String[] args) {
        // Calculate shipping for different weights
        double packageWeight = 10.0;

        System.out.println("Package weight: " + packageWeight + " lbs\n");
        System.out.println("Shipping options:");

        for (ShippingMethod method : ShippingMethod.values()) {
            if (method.isAvailableFor(packageWeight)) {
                double cost = method.calculateCost(packageWeight);
                System.out.printf("%s: $%.2f (%s)%n",
                    method, cost, method.getDescription());
            } else {
                System.out.printf("%s: Not available for this weight%n", method);
            }
        }


        // Find cheapest option
        double weight = 15.0;
        ShippingMethod cheapest = ShippingMethod.STANDARD;
        double lowestCost = cheapest.calculateCost(weight);

        for (ShippingMethod method : ShippingMethod.values()) {
            if (method.isAvailableFor(weight)) {
                double cost = method.calculateCost(weight);
                if (cost < lowestCost) {
                    cheapest = method;
                    lowestCost = cost;
                }
            }
        }

        System.out.printf("\nFor %.1f lbs, cheapest: %s ($%.2f)%n",
            weight, cheapest, lowestCost);

        // Find fastest under budget
        double budget = 15.00;
        ShippingMethod fastest = null;

        for (ShippingMethod method : ShippingMethod.values()) {
            double cost = method.calculateCost(weight);
            if (cost <= budget) {
                if (fastest == null || method.getDaysMin() < fastest.getDaysMin()) {
                    fastest = method;
                }
            }
        }

        if (fastest != null) {
            System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",
                budget, fastest,
                (double)fastest.getDaysMin(),
                fastest.calculateCost(weight));
        }

    }
}

                        
1packageWeight ← 10.0⋯44public class ComplexEnum {45    public static void main(String[] args) {46        // Calculate shipping for different weights47        double packageWeight→ 10.0 = 10.0;48        //@packageWeight=10.0, 20.0, 60.049        50        System.out.println("Package weight: " + packageWeight10.0 + " lbs\n");51        System.out.println("Shipping options:");⋯outputPackage weight: 10.0 lbs
Shipping options:
2this.baseCost ← 5.99, this.daysMin ← 5, this.description ← 5-7 business dayspass 1 of 4⋯14ShippingMethod(double baseCost5.99, int daysMin5, String description5-7 business days) {15    this.baseCost→ 5.99 = baseCost5.99;16    this.daysMin→ 5 = daysMin5;17    this.description→ 5-7 business days = description5-7 business days;18}⋯All 4 passes — pass 1 is the card abovepassbaseCostdaysMindescriptionthis.baseCostthis.daysMinthis.description
15.9955-7 business days5.9955-7 business days
212.9922-3 business days12.9922-3 business days
324.991Next business day24.991Next business day
435.0107-14 business days35.0107-14 business days
3for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯53for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {54    if (method.isAvailableFor(packageWeight)) {⋯All 4 passes — pass 1 is the card abovepassmethod
1STANDARD
2EXPRESS
3OVERNIGHT
4INTERNATIONAL
4public boolean isAvailableFor(double weightPounds)pass 1 of 8⋯31// Check if available for weight32public boolean isAvailableFor(double weightPounds10.0) {33    if (this == OVERNIGHT && weightPounds > 50) {34        return false;  // Overnight has weight limit35    }36    return true;37}⋯All 8 passes — pass 1 is the card abovepassweightPounds
110.0
210.0
310.0
410.0
55.0
65.0
75.0
85.0
5if (method.isAvailableFor(packageWeight))pass 1 of 4⋯53for (ShippingMethod method : ShippingMethod.values()) {54    if (method.isAvailableFor(packageWeight10.0)) {55        double cost = method.calculateCost(packageWeight10.0);56        System.out.printf("%s: $%.2f (%s)%n",⋯
6public double calculateCost(double weightPounds)pass 1 of 14⋯20// Calculate cost with weight21public double calculateCost(double weightPounds10.0) {22    if (this == INTERNATIONAL) {⋯14 passes — pass 1 is the card abovepassweightPounds
110.0
210.0
310.0
410.0
55.0
65.0
75.0
85.0
95.0
⋯ 3 more passes ⋯
135.0
145.0
7elsepass 1 of 8⋯25    return baseCost + (weightPounds * 1.50);26} else {27    return baseCost5.99 + (weightPounds10.0 * 0.50);28}⋯All 8 passes — pass 1 is the card abovepassbaseCostweightPounds
15.9910.0
212.9910.0
35.995.0
45.995.0
512.995.0
65.995.0
712.995.0
85.995.0
8cost ← 10.99⋯54if (method.isAvailableFor(packageWeight)) {55    double cost→ 10.99 = method.calculateCost(packageWeight10.0);56    System.out.printf("%s: $%.2f (%s)%n",57        methodSTANDARD, cost10.99, method.getDescription());58} else {⋯
9public String getDescription()pass 1 of 4⋯39public double getBaseCost() { return baseCost; }40public String getDescription() { return description5-7 business days; }41public int getDaysMin() { return daysMin; }⋯All 4 passes — pass 1 is the card abovepassdescription
15-7 business days
22-3 business days
3Next business day
47-14 business days
10method, cost, method.getDescription());⋯55    double cost = method.calculateCost(packageWeight);56    System.out.printf("%s: $%.2f (%s)%n",57        methodSTANDARD, cost10.99, method.getDescription());58} else {⋯
11cost ← 17.990000000000002⋯54if (method.isAvailableFor(packageWeight)) {55    double cost→ 17.990000000000002 = method.calculateCost(packageWeight10.0);56    System.out.printf("%s: $%.2f (%s)%n",57        methodEXPRESS, cost17.990000000000002, method.getDescription());58} else {⋯
12method, cost, method.getDescription());⋯55    double cost = method.calculateCost(packageWeight);56    System.out.printf("%s: $%.2f (%s)%n",57        methodEXPRESS, cost17.990000000000002, method.getDescription());58} else {⋯
13if (this == OVERNIGHT)pass 1 of 3⋯23    return baseCost + (weightPounds * 2.50);24} else if (this == OVERNIGHT) {25    return baseCost24.99 + (weightPounds10.0 * 1.50);26} else {⋯All 3 passes — pass 1 is the card abovepassweightPounds
110.0
25.0
35.0
14cost ← 39.989999999999995⋯54if (method.isAvailableFor(packageWeight)) {55    double cost→ 39.989999999999995 = method.calculateCost(packageWeight10.0);56    System.out.printf("%s: $%.2f (%s)%n",57        methodOVERNIGHT, cost39.989999999999995, method.getDescription());58} else {⋯
15method, cost, method.getDescription());⋯55    double cost = method.calculateCost(packageWeight);56    System.out.printf("%s: $%.2f (%s)%n",57        methodOVERNIGHT, cost39.989999999999995, method.getDescription());58} else {⋯
16if (this == INTERNATIONAL)pass 1 of 3⋯21public double calculateCost(double weightPounds) {22    if (this == INTERNATIONAL) {23        return baseCost35.0 + (weightPounds10.0 * 2.50);24    } else if (this == OVERNIGHT) {⋯All 3 passes — pass 1 is the card abovepassweightPounds
110.0
25.0
35.0
17cost ← 60.0⋯54if (method.isAvailableFor(packageWeight)) {55    double cost→ 60.0 = method.calculateCost(packageWeight10.0);56    System.out.printf("%s: $%.2f (%s)%n",57        methodINTERNATIONAL, cost60.0, method.getDescription());58} else {⋯
18method, cost, method.getDescription());⋯55    double cost = method.calculateCost(packageWeight);56    System.out.printf("%s: $%.2f (%s)%n",57        methodINTERNATIONAL, cost60.0, method.getDescription());58} else {⋯
19weight ← 5.0, cheapest ← STANDARD⋯69// Find cheapest option70double weight→ 5.0 = 5.0;71//@weight=5.0, 15.072ShippingMethod cheapest→ STANDARD = ShippingMethod.STANDARD;73double lowestCost = cheapest.calculateCost(weight5.0);⋯
20lowestCost ← 8.49⋯72ShippingMethod cheapest = ShippingMethod.STANDARD;73double lowestCost→ 8.49 = cheapest.calculateCost(weight5.0);⋯
21for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯75for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {76    if (method.isAvailableFor(weight)) {⋯All 4 passes — pass 1 is the card abovepassmethod
1STANDARD
2EXPRESS
3OVERNIGHT
4INTERNATIONAL
22if (method.isAvailableFor(weight))pass 1 of 4⋯75for (ShippingMethod method : ShippingMethod.values()) {76    if (method.isAvailableFor(weight5.0)) {77        double cost = method.calculateCost(weight5.0);78        if (cost < lowestCost) {⋯
23cost ← 8.49⋯76if (method.isAvailableFor(weight)) {77    double cost→ 8.49 = method.calculateCost(weight5.0);78    if (cost < lowestCost) {⋯
24cost ← 15.49⋯76if (method.isAvailableFor(weight)) {77    double cost→ 15.49 = method.calculateCost(weight5.0);78    if (cost < lowestCost) {⋯
25cost ← 32.489999999999995⋯76if (method.isAvailableFor(weight)) {77    double cost→ 32.489999999999995 = method.calculateCost(weight5.0);78    if (cost < lowestCost) {⋯
26cost ← 47.5⋯76if (method.isAvailableFor(weight)) {77    double cost→ 47.5 = method.calculateCost(weight5.0);78    if (cost < lowestCost) {⋯
27budget ← 15.0, fastest ← null⋯85System.out.printf("\nFor %.1f lbs, cheapest: %s ($%.2f)%n",86    weight5.0, cheapestSTANDARD, lowestCost8.49);8788// Find fastest under budget89double budget→ 15.0 = 15.00;90ShippingMethod fastest→ null = null;⋯
28for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯92for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {93    double cost = method.calculateCost(weight5.0);94    if (cost <= budget) {⋯All 4 passes — pass 1 is the card abovepassmethod
1STANDARD
2EXPRESS
3OVERNIGHT
4INTERNATIONAL
29cost ← 8.49⋯92for (ShippingMethod method : ShippingMethod.values()) {93    double cost→ 8.49 = method.calculateCost(weight5.0);94    if (cost <= budget) {⋯
30if (cost <= budget)⋯93double cost = method.calculateCost(weight);94if (cost8.49 <= budget15.0) {95    if (fastest == null || method.getDaysMin() < fastest.getDaysMin()) {⋯
31fastest ← STANDARD⋯94if (cost <= budget) {95    if (fastestnull == null || method.getDaysMin() < fastest.getDaysMin()) {96        fastest→ STANDARD = methodSTANDARD;97    }⋯
32cost ← 15.49⋯92for (ShippingMethod method : ShippingMethod.values()) {93    double cost→ 15.49 = method.calculateCost(weight5.0);94    if (cost <= budget) {⋯
33cost ← 32.489999999999995⋯92for (ShippingMethod method : ShippingMethod.values()) {93    double cost→ 32.489999999999995 = method.calculateCost(weight5.0);94    if (cost <= budget) {⋯
34cost ← 47.5⋯92for (ShippingMethod method : ShippingMethod.values()) {93    double cost→ 47.5 = method.calculateCost(weight5.0);94    if (cost <= budget) {⋯
35if (fastest != null)⋯101if (fastestSTANDARD != null) {102    System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",103        budget15.0, fastestSTANDARD, 104        (double)fastest.getDaysMin(),105        fastest.calculateCost(weight5.0));106}⋯
36public int getDaysMin()⋯40    public String getDescription() { return description; }41    public int getDaysMin() { return daysMin5; }42}⋯
37budget, fastest,⋯101if (fastest != null) {102    System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",103        budget15.0, fastestSTANDARD, 104        (double)fastest.getDaysMin(),105        fastest.calculateCost(weight5.0));106}⋯
1packageWeight ← 20.0⋯44public class ComplexEnum {45    public static void main(String[] args) {46        // Calculate shipping for different weights47        double packageWeight→ 20.0 = 20.0;48        49        System.out.println("Package weight: " + packageWeight20.0 + " lbs\n");50        System.out.println("Shipping options:");⋯outputPackage weight: 20.0 lbs
Shipping options:
2this.baseCost ← 5.99, this.daysMin ← 5, this.description ← 5-7 business dayspass 1 of 4⋯14ShippingMethod(double baseCost5.99, int daysMin5, String description5-7 business days) {15    this.baseCost→ 5.99 = baseCost5.99;16    this.daysMin→ 5 = daysMin5;17    this.description→ 5-7 business days = description5-7 business days;18}⋯All 4 passes — pass 1 is the card abovepassbaseCostdaysMindescriptionthis.baseCostthis.daysMinthis.description
15.9955-7 business days5.9955-7 business days
212.9922-3 business days12.9922-3 business days
324.991Next business day24.991Next business day
435.0107-14 business days35.0107-14 business days
3for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯52for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {53    if (method.isAvailableFor(packageWeight)) {⋯All 4 passes — pass 1 is the card abovepassmethod
1STANDARD
2EXPRESS
3OVERNIGHT
4INTERNATIONAL
4public boolean isAvailableFor(double weightPounds)pass 1 of 8⋯31// Check if available for weight32public boolean isAvailableFor(double weightPounds20.0) {33    if (this == OVERNIGHT && weightPounds > 50) {34        return false;  // Overnight has weight limit35    }36    return true;37}⋯All 8 passes — pass 1 is the card abovepassweightPounds
120.0
220.0
320.0
420.0
55.0
65.0
75.0
85.0
5if (method.isAvailableFor(packageWeight))pass 1 of 4⋯52for (ShippingMethod method : ShippingMethod.values()) {53    if (method.isAvailableFor(packageWeight20.0)) {54        double cost = method.calculateCost(packageWeight20.0);55        System.out.printf("%s: $%.2f (%s)%n",⋯
6public double calculateCost(double weightPounds)pass 1 of 14⋯20// Calculate cost with weight21public double calculateCost(double weightPounds20.0) {22    if (this == INTERNATIONAL) {⋯14 passes — pass 1 is the card abovepassweightPounds
120.0
220.0
320.0
420.0
55.0
65.0
75.0
85.0
95.0
⋯ 3 more passes ⋯
135.0
145.0
7elsepass 1 of 8⋯25    return baseCost + (weightPounds * 1.50);26} else {27    return baseCost5.99 + (weightPounds20.0 * 0.50);28}⋯All 8 passes — pass 1 is the card abovepassbaseCostweightPounds
15.9920.0
212.9920.0
35.995.0
45.995.0
512.995.0
65.995.0
712.995.0
85.995.0
8cost ← 15.99⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 15.99 = method.calculateCost(packageWeight20.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodSTANDARD, cost15.99, method.getDescription());57} else {⋯
9public String getDescription()pass 1 of 4⋯39public double getBaseCost() { return baseCost; }40public String getDescription() { return description5-7 business days; }41public int getDaysMin() { return daysMin; }⋯All 4 passes — pass 1 is the card abovepassdescription
15-7 business days
22-3 business days
3Next business day
47-14 business days
10method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodSTANDARD, cost15.99, method.getDescription());57} else {⋯
11cost ← 22.990000000000002⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 22.990000000000002 = method.calculateCost(packageWeight20.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodEXPRESS, cost22.990000000000002, method.getDescription());57} else {⋯
12method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodEXPRESS, cost22.990000000000002, method.getDescription());57} else {⋯
13if (this == OVERNIGHT)pass 1 of 3⋯23    return baseCost + (weightPounds * 2.50);24} else if (this == OVERNIGHT) {25    return baseCost24.99 + (weightPounds20.0 * 1.50);26} else {⋯All 3 passes — pass 1 is the card abovepassweightPounds
120.0
25.0
35.0
14cost ← 54.989999999999995⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 54.989999999999995 = method.calculateCost(packageWeight20.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodOVERNIGHT, cost54.989999999999995, method.getDescription());57} else {⋯
15method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodOVERNIGHT, cost54.989999999999995, method.getDescription());57} else {⋯
16if (this == INTERNATIONAL)pass 1 of 3⋯21public double calculateCost(double weightPounds) {22    if (this == INTERNATIONAL) {23        return baseCost35.0 + (weightPounds20.0 * 2.50);24    } else if (this == OVERNIGHT) {⋯All 3 passes — pass 1 is the card abovepassweightPounds
120.0
25.0
35.0
17cost ← 85.0⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 85.0 = method.calculateCost(packageWeight20.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodINTERNATIONAL, cost85.0, method.getDescription());57} else {⋯
18method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodINTERNATIONAL, cost85.0, method.getDescription());57} else {⋯
19weight ← 5.0, cheapest ← STANDARD⋯63// Find cheapest option64double weight→ 5.0 = 5.0;65ShippingMethod cheapest→ STANDARD = ShippingMethod.STANDARD;66double lowestCost = cheapest.calculateCost(weight5.0);⋯
20lowestCost ← 8.49⋯65ShippingMethod cheapest = ShippingMethod.STANDARD;66double lowestCost→ 8.49 = cheapest.calculateCost(weight5.0);⋯
21for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯68for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {69    if (method.isAvailableFor(weight)) {⋯All 4 passes — pass 1 is the card abovepassmethod
1STANDARD
2EXPRESS
3OVERNIGHT
4INTERNATIONAL
22if (method.isAvailableFor(weight))pass 1 of 4⋯68for (ShippingMethod method : ShippingMethod.values()) {69    if (method.isAvailableFor(weight5.0)) {70        double cost = method.calculateCost(weight5.0);71        if (cost < lowestCost) {⋯
23cost ← 8.49⋯69if (method.isAvailableFor(weight)) {70    double cost→ 8.49 = method.calculateCost(weight5.0);71    if (cost < lowestCost) {⋯
24cost ← 15.49⋯69if (method.isAvailableFor(weight)) {70    double cost→ 15.49 = method.calculateCost(weight5.0);71    if (cost < lowestCost) {⋯
25cost ← 32.489999999999995⋯69if (method.isAvailableFor(weight)) {70    double cost→ 32.489999999999995 = method.calculateCost(weight5.0);71    if (cost < lowestCost) {⋯
26cost ← 47.5⋯69if (method.isAvailableFor(weight)) {70    double cost→ 47.5 = method.calculateCost(weight5.0);71    if (cost < lowestCost) {⋯
27budget ← 15.0, fastest ← null⋯78System.out.printf("\nFor %.1f lbs, cheapest: %s ($%.2f)%n",79    weight5.0, cheapestSTANDARD, lowestCost8.49);8081// Find fastest under budget82double budget→ 15.0 = 15.00;83ShippingMethod fastest→ null = null;⋯
28for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯85for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {86    double cost = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯All 4 passes — pass 1 is the card abovepassmethod
1STANDARD
2EXPRESS
3OVERNIGHT
4INTERNATIONAL
29cost ← 8.49⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 8.49 = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯
30if (cost <= budget)⋯86double cost = method.calculateCost(weight);87if (cost8.49 <= budget15.0) {88    if (fastest == null || method.getDaysMin() < fastest.getDaysMin()) {⋯
31fastest ← STANDARD⋯87if (cost <= budget) {88    if (fastestnull == null || method.getDaysMin() < fastest.getDaysMin()) {89        fastest→ STANDARD = methodSTANDARD;90    }⋯
32cost ← 15.49⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 15.49 = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯
33cost ← 32.489999999999995⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 32.489999999999995 = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯
34cost ← 47.5⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 47.5 = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯
35if (fastest != null)⋯94if (fastestSTANDARD != null) {95    System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",96        budget15.0, fastestSTANDARD, 97        (double)fastest.getDaysMin(),98        fastest.calculateCost(weight5.0));99}⋯
36public int getDaysMin()⋯40    public String getDescription() { return description; }41    public int getDaysMin() { return daysMin5; }42}⋯
37budget, fastest,⋯94if (fastest != null) {95    System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",96        budget15.0, fastestSTANDARD, 97        (double)fastest.getDaysMin(),98        fastest.calculateCost(weight5.0));99}⋯
1packageWeight ← 60.0⋯44public class ComplexEnum {45    public static void main(String[] args) {46        // Calculate shipping for different weights47        double packageWeight→ 60.0 = 60.0;48        49        System.out.println("Package weight: " + packageWeight60.0 + " lbs\n");50        System.out.println("Shipping options:");⋯outputPackage weight: 60.0 lbs
Shipping options:
2this.baseCost ← 5.99, this.daysMin ← 5, this.description ← 5-7 business dayspass 1 of 4⋯14ShippingMethod(double baseCost5.99, int daysMin5, String description5-7 business days) {15    this.baseCost→ 5.99 = baseCost5.99;16    this.daysMin→ 5 = daysMin5;17    this.description→ 5-7 business days = description5-7 business days;18}⋯All 4 passes — pass 1 is the card abovepassbaseCostdaysMindescriptionthis.baseCostthis.daysMinthis.description
15.9955-7 business days5.9955-7 business days
212.9922-3 business days12.9922-3 business days
324.991Next business day24.991Next business day
435.0107-14 business days35.0107-14 business days
3for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯52for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {53    if (method.isAvailableFor(packageWeight)) {⋯All 4 passes — pass 1 is the card abovepassmethodweightPounds
1STANDARD—
2EXPRESS—
3OVERNIGHT60.0
4INTERNATIONAL—
4public boolean isAvailableFor(double weightPounds)pass 1 of 8⋯31// Check if available for weight32public boolean isAvailableFor(double weightPounds60.0) {33    if (this == OVERNIGHT && weightPounds > 50) {34        return false;  // Overnight has weight limit35    }36    return true;37}⋯All 8 passes — pass 1 is the card abovepassweightPoundsmethodbaseCost
160.0——
260.0——
360.0OVERNIGHT—
460.0——
55.0——
65.0——
75.0—24.99
85.0——
5if (method.isAvailableFor(packageWeight))pass 1 of 3⋯52for (ShippingMethod method : ShippingMethod.values()) {53    if (method.isAvailableFor(packageWeight60.0)) {54        double cost = method.calculateCost(packageWeight60.0);55        System.out.printf("%s: $%.2f (%s)%n",⋯
6public double calculateCost(double weightPounds)pass 1 of 13⋯20// Calculate cost with weight21public double calculateCost(double weightPounds60.0) {22    if (this == INTERNATIONAL) {⋯13 passes — pass 1 is the card abovepassweightPoundsbaseCost
160.0—
260.0—
360.0—
45.0—
55.0—
65.0—
75.024.99
85.0—
95.0—
⋯ 2 more passes ⋯
125.0—
135.0—
7elsepass 1 of 8⋯25    return baseCost + (weightPounds * 1.50);26} else {27    return baseCost5.99 + (weightPounds60.0 * 0.50);28}⋯All 8 passes — pass 1 is the card abovepassbaseCostweightPounds
15.9960.0
212.9960.0
35.995.0
45.995.0
512.995.0
65.995.0
712.995.0
85.995.0
8cost ← 35.99⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 35.99 = method.calculateCost(packageWeight60.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodSTANDARD, cost35.99, method.getDescription());57} else {⋯
9public String getDescription()pass 1 of 3⋯39public double getBaseCost() { return baseCost; }40public String getDescription() { return description5-7 business days; }41public int getDaysMin() { return daysMin; }⋯All 3 passes — pass 1 is the card abovepassdescription
15-7 business days
22-3 business days
37-14 business days
10method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodSTANDARD, cost35.99, method.getDescription());57} else {⋯
11cost ← 42.99⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 42.99 = method.calculateCost(packageWeight60.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodEXPRESS, cost42.99, method.getDescription());57} else {⋯
12method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodEXPRESS, cost42.99, method.getDescription());57} else {⋯
13if (this == OVERNIGHT && weightPounds > 50)⋯32public boolean isAvailableFor(double weightPounds) {33    if (this == OVERNIGHT && weightPounds60.0 > 50) {34        return false;  // Overnight has weight limit35    }⋯
14else⋯56        method, cost, method.getDescription());57} else {58    System.out.printf("%s: Not available for this weight%n", methodOVERNIGHT);59}⋯
15if (this == INTERNATIONAL)pass 1 of 3⋯21public double calculateCost(double weightPounds) {22    if (this == INTERNATIONAL) {23        return baseCost35.0 + (weightPounds60.0 * 2.50);24    } else if (this == OVERNIGHT) {⋯All 3 passes — pass 1 is the card abovepassweightPounds
160.0
25.0
35.0
16cost ← 185.0⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 185.0 = method.calculateCost(packageWeight60.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodINTERNATIONAL, cost185.0, method.getDescription());57} else {⋯
17method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodINTERNATIONAL, cost185.0, method.getDescription());57} else {⋯
18weight ← 5.0, cheapest ← STANDARD⋯63// Find cheapest option64double weight→ 5.0 = 5.0;65ShippingMethod cheapest→ STANDARD = ShippingMethod.STANDARD;66double lowestCost = cheapest.calculateCost(weight5.0);⋯
19lowestCost ← 8.49⋯65ShippingMethod cheapest = ShippingMethod.STANDARD;66double lowestCost→ 8.49 = cheapest.calculateCost(weight5.0);⋯
20for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯68for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {69    if (method.isAvailableFor(weight)) {⋯All 4 passes — pass 1 is the card abovepassmethodbaseCostweightPounds
1STANDARD——
2EXPRESS——
3OVERNIGHT24.995.0
4INTERNATIONAL——
21if (method.isAvailableFor(weight))pass 1 of 4⋯68for (ShippingMethod method : ShippingMethod.values()) {69    if (method.isAvailableFor(weight5.0)) {70        double cost = method.calculateCost(weight5.0);71        if (cost < lowestCost) {⋯All 4 passes — pass 1 is the card abovepassbaseCostweightPounds
1——
2——
324.995.0
4——
22cost ← 8.49⋯69if (method.isAvailableFor(weight)) {70    double cost→ 8.49 = method.calculateCost(weight5.0);71    if (cost < lowestCost) {⋯
23cost ← 15.49⋯69if (method.isAvailableFor(weight)) {70    double cost→ 15.49 = method.calculateCost(weight5.0);71    if (cost < lowestCost) {⋯
24if (this == OVERNIGHT)pass 1 of 2⋯23    return baseCost + (weightPounds * 2.50);24} else if (this == OVERNIGHT) {25    return baseCost24.99 + (weightPounds5.0 * 1.50);26} else {⋯
25cost ← 32.489999999999995⋯69if (method.isAvailableFor(weight)) {70    double cost→ 32.489999999999995 = method.calculateCost(weight5.0);71    if (cost < lowestCost) {⋯
26cost ← 47.5⋯69if (method.isAvailableFor(weight)) {70    double cost→ 47.5 = method.calculateCost(weight5.0);71    if (cost < lowestCost) {⋯
27budget ← 15.0, fastest ← null⋯78System.out.printf("\nFor %.1f lbs, cheapest: %s ($%.2f)%n",79    weight5.0, cheapestSTANDARD, lowestCost8.49);8081// Find fastest under budget82double budget→ 15.0 = 15.00;83ShippingMethod fastest→ null = null;⋯
28for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯85for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {86    double cost = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯All 4 passes — pass 1 is the card abovepassmethodbaseCostweightPounds
1STANDARD——
2EXPRESS——
3OVERNIGHT24.995.0
4INTERNATIONAL——
29cost ← 8.49⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 8.49 = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯
30if (cost <= budget)⋯86double cost = method.calculateCost(weight);87if (cost8.49 <= budget15.0) {88    if (fastest == null || method.getDaysMin() < fastest.getDaysMin()) {⋯
31fastest ← STANDARD⋯87if (cost <= budget) {88    if (fastestnull == null || method.getDaysMin() < fastest.getDaysMin()) {89        fastest→ STANDARD = methodSTANDARD;90    }⋯
32cost ← 15.49⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 15.49 = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯
33if (this == OVERNIGHT)pass 2 of 2⋯23    return baseCost + (weightPounds * 2.50);24} else if (this == OVERNIGHT) {25    return baseCost24.99 + (weightPounds5.0 * 1.50);26} else {⋯
34cost ← 32.489999999999995⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 32.489999999999995 = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯
35cost ← 47.5⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 47.5 = method.calculateCost(weight5.0);87    if (cost <= budget) {⋯
36if (fastest != null)⋯94if (fastestSTANDARD != null) {95    System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",96        budget15.0, fastestSTANDARD, 97        (double)fastest.getDaysMin(),98        fastest.calculateCost(weight5.0));99}⋯
37public int getDaysMin()⋯40    public String getDescription() { return description; }41    public int getDaysMin() { return daysMin5; }42}⋯
38budget, fastest,⋯94if (fastest != null) {95    System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",96        budget15.0, fastestSTANDARD, 97        (double)fastest.getDaysMin(),98        fastest.calculateCost(weight5.0));99}⋯
1packageWeight ← 10.0⋯44public class ComplexEnum {45    public static void main(String[] args) {46        // Calculate shipping for different weights47        double packageWeight→ 10.0 = 10.0;48        49        System.out.println("Package weight: " + packageWeight10.0 + " lbs\n");50        System.out.println("Shipping options:");⋯outputPackage weight: 10.0 lbs
Shipping options:
2this.baseCost ← 5.99, this.daysMin ← 5, this.description ← 5-7 business dayspass 1 of 4⋯14ShippingMethod(double baseCost5.99, int daysMin5, String description5-7 business days) {15    this.baseCost→ 5.99 = baseCost5.99;16    this.daysMin→ 5 = daysMin5;17    this.description→ 5-7 business days = description5-7 business days;18}⋯All 4 passes — pass 1 is the card abovepassbaseCostdaysMindescriptionthis.baseCostthis.daysMinthis.description
15.9955-7 business days5.9955-7 business days
212.9922-3 business days12.9922-3 business days
324.991Next business day24.991Next business day
435.0107-14 business days35.0107-14 business days
3for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯52for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {53    if (method.isAvailableFor(packageWeight)) {⋯All 4 passes — pass 1 is the card abovepassmethod
1STANDARD
2EXPRESS
3OVERNIGHT
4INTERNATIONAL
4public boolean isAvailableFor(double weightPounds)pass 1 of 8⋯31// Check if available for weight32public boolean isAvailableFor(double weightPounds10.0) {33    if (this == OVERNIGHT && weightPounds > 50) {34        return false;  // Overnight has weight limit35    }36    return true;37}⋯All 8 passes — pass 1 is the card abovepassweightPounds
110.0
210.0
310.0
410.0
515.0
615.0
715.0
815.0
5if (method.isAvailableFor(packageWeight))pass 1 of 4⋯52for (ShippingMethod method : ShippingMethod.values()) {53    if (method.isAvailableFor(packageWeight10.0)) {54        double cost = method.calculateCost(packageWeight10.0);55        System.out.printf("%s: $%.2f (%s)%n",⋯
6public double calculateCost(double weightPounds)pass 1 of 14⋯20// Calculate cost with weight21public double calculateCost(double weightPounds10.0) {22    if (this == INTERNATIONAL) {⋯14 passes — pass 1 is the card abovepassweightPounds
110.0
210.0
310.0
410.0
515.0
615.0
715.0
815.0
915.0
⋯ 3 more passes ⋯
1315.0
1415.0
7elsepass 1 of 8⋯25    return baseCost + (weightPounds * 1.50);26} else {27    return baseCost5.99 + (weightPounds10.0 * 0.50);28}⋯All 8 passes — pass 1 is the card abovepassbaseCostweightPounds
15.9910.0
212.9910.0
35.9915.0
45.9915.0
512.9915.0
65.9915.0
712.9915.0
85.9915.0
8cost ← 10.99⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 10.99 = method.calculateCost(packageWeight10.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodSTANDARD, cost10.99, method.getDescription());57} else {⋯
9public String getDescription()pass 1 of 4⋯39public double getBaseCost() { return baseCost; }40public String getDescription() { return description5-7 business days; }41public int getDaysMin() { return daysMin; }⋯All 4 passes — pass 1 is the card abovepassdescription
15-7 business days
22-3 business days
3Next business day
47-14 business days
10method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodSTANDARD, cost10.99, method.getDescription());57} else {⋯
11cost ← 17.990000000000002⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 17.990000000000002 = method.calculateCost(packageWeight10.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodEXPRESS, cost17.990000000000002, method.getDescription());57} else {⋯
12method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodEXPRESS, cost17.990000000000002, method.getDescription());57} else {⋯
13if (this == OVERNIGHT)pass 1 of 3⋯23    return baseCost + (weightPounds * 2.50);24} else if (this == OVERNIGHT) {25    return baseCost24.99 + (weightPounds10.0 * 1.50);26} else {⋯All 3 passes — pass 1 is the card abovepassweightPounds
110.0
215.0
315.0
14cost ← 39.989999999999995⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 39.989999999999995 = method.calculateCost(packageWeight10.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodOVERNIGHT, cost39.989999999999995, method.getDescription());57} else {⋯
15method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodOVERNIGHT, cost39.989999999999995, method.getDescription());57} else {⋯
16if (this == INTERNATIONAL)pass 1 of 3⋯21public double calculateCost(double weightPounds) {22    if (this == INTERNATIONAL) {23        return baseCost35.0 + (weightPounds10.0 * 2.50);24    } else if (this == OVERNIGHT) {⋯All 3 passes — pass 1 is the card abovepassweightPounds
110.0
215.0
315.0
17cost ← 60.0⋯53if (method.isAvailableFor(packageWeight)) {54    double cost→ 60.0 = method.calculateCost(packageWeight10.0);55    System.out.printf("%s: $%.2f (%s)%n",56        methodINTERNATIONAL, cost60.0, method.getDescription());57} else {⋯
18method, cost, method.getDescription());⋯54    double cost = method.calculateCost(packageWeight);55    System.out.printf("%s: $%.2f (%s)%n",56        methodINTERNATIONAL, cost60.0, method.getDescription());57} else {⋯
19weight ← 15.0, cheapest ← STANDARD⋯63// Find cheapest option64double weight→ 15.0 = 15.0;65ShippingMethod cheapest→ STANDARD = ShippingMethod.STANDARD;66double lowestCost = cheapest.calculateCost(weight15.0);⋯
20lowestCost ← 13.49⋯65ShippingMethod cheapest = ShippingMethod.STANDARD;66double lowestCost→ 13.49 = cheapest.calculateCost(weight15.0);⋯
21for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯68for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {69    if (method.isAvailableFor(weight)) {⋯All 4 passes — pass 1 is the card abovepassmethod
1STANDARD
2EXPRESS
3OVERNIGHT
4INTERNATIONAL
22if (method.isAvailableFor(weight))pass 1 of 4⋯68for (ShippingMethod method : ShippingMethod.values()) {69    if (method.isAvailableFor(weight15.0)) {70        double cost = method.calculateCost(weight15.0);71        if (cost < lowestCost) {⋯
23cost ← 13.49⋯69if (method.isAvailableFor(weight)) {70    double cost→ 13.49 = method.calculateCost(weight15.0);71    if (cost < lowestCost) {⋯
24cost ← 20.490000000000002⋯69if (method.isAvailableFor(weight)) {70    double cost→ 20.490000000000002 = method.calculateCost(weight15.0);71    if (cost < lowestCost) {⋯
25cost ← 47.489999999999995⋯69if (method.isAvailableFor(weight)) {70    double cost→ 47.489999999999995 = method.calculateCost(weight15.0);71    if (cost < lowestCost) {⋯
26cost ← 72.5⋯69if (method.isAvailableFor(weight)) {70    double cost→ 72.5 = method.calculateCost(weight15.0);71    if (cost < lowestCost) {⋯
27budget ← 15.0, fastest ← null⋯78System.out.printf("\nFor %.1f lbs, cheapest: %s ($%.2f)%n",79    weight15.0, cheapestSTANDARD, lowestCost13.49);8081// Find fastest under budget82double budget→ 15.0 = 15.00;83ShippingMethod fastest→ null = null;⋯
28for (ShippingMethod method : ShippingMethod.values())pass 1 of 4⋯85for (ShippingMethod methodSTANDARD : ShippingMethod.values()) {86    double cost = method.calculateCost(weight15.0);87    if (cost <= budget) {⋯All 4 passes — pass 1 is the card abovepassmethod
1STANDARD
2EXPRESS
3OVERNIGHT
4INTERNATIONAL
29cost ← 13.49⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 13.49 = method.calculateCost(weight15.0);87    if (cost <= budget) {⋯
30if (cost <= budget)⋯86double cost = method.calculateCost(weight);87if (cost13.49 <= budget15.0) {88    if (fastest == null || method.getDaysMin() < fastest.getDaysMin()) {⋯
31fastest ← STANDARD⋯87if (cost <= budget) {88    if (fastestnull == null || method.getDaysMin() < fastest.getDaysMin()) {89        fastest→ STANDARD = methodSTANDARD;90    }⋯
32cost ← 20.490000000000002⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 20.490000000000002 = method.calculateCost(weight15.0);87    if (cost <= budget) {⋯
33cost ← 47.489999999999995⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 47.489999999999995 = method.calculateCost(weight15.0);87    if (cost <= budget) {⋯
34cost ← 72.5⋯85for (ShippingMethod method : ShippingMethod.values()) {86    double cost→ 72.5 = method.calculateCost(weight15.0);87    if (cost <= budget) {⋯
35if (fastest != null)⋯94if (fastestSTANDARD != null) {95    System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",96        budget15.0, fastestSTANDARD, 97        (double)fastest.getDaysMin(),98        fastest.calculateCost(weight15.0));99}⋯
36public int getDaysMin()⋯40    public String getDescription() { return description; }41    public int getDaysMin() { return daysMin5; }42}⋯
37budget, fastest,⋯94if (fastest != null) {95    System.out.printf("Budget $%.2f: %s (%.0f days, $%.2f)%n",96        budget15.0, fastestSTANDARD, 97        (double)fastest.getDaysMin(),98        fastest.calculateCost(weight15.0));99}⋯

All 4 passes — pass 1 is the card above
pass	`baseCost`	`daysMin`	`description`	`this.baseCost`	`this.daysMin`	`this.description`
1	5.99	5	5-7 business days	5.99	5	5-7 business days
2	12.99	2	2-3 business days	12.99	2	2-3 business days
3	24.99	1	Next business day	24.99	1	Next business day
4	35.0	10	7-14 business days	35.0	10	7-14 business days

All 4 passes — pass 1 is the card above
pass	`method`
1	STANDARD
2	EXPRESS
3	OVERNIGHT
4	INTERNATIONAL

All 8 passes — pass 1 is the card above
pass	`weightPounds`
1	10.0
2	10.0
3	10.0
4	10.0
5	5.0
6	5.0
7	5.0
8	5.0

14 passes — pass 1 is the card above
pass	`weightPounds`
1	10.0
2	10.0
3	10.0
4	10.0
5	5.0
6	5.0
7	5.0
8	5.0
9	5.0
⋯ 3 more passes ⋯
13	5.0
14	5.0

All 8 passes — pass 1 is the card above
pass	`baseCost`	`weightPounds`
1	5.99	10.0
2	12.99	10.0
3	5.99	5.0
4	5.99	5.0
5	12.99	5.0
6	5.99	5.0
7	12.99	5.0
8	5.99	5.0

All 4 passes — pass 1 is the card above
pass	`description`
1	5-7 business days
2	2-3 business days
3	Next business day
4	7-14 business days

All 3 passes — pass 1 is the card above
pass	`weightPounds`
1	10.0
2	5.0
3	5.0

All 3 passes — pass 1 is the card above
pass	`weightPounds`
1	10.0
2	5.0
3	5.0

All 4 passes — pass 1 is the card above
pass	`method`
1	STANDARD
2	EXPRESS
3	OVERNIGHT
4	INTERNATIONAL

All 4 passes — pass 1 is the card above
pass	`method`
1	STANDARD
2	EXPRESS
3	OVERNIGHT
4	INTERNATIONAL

All 4 passes — pass 1 is the card above
pass	`baseCost`	`daysMin`	`description`	`this.baseCost`	`this.daysMin`	`this.description`
1	5.99	5	5-7 business days	5.99	5	5-7 business days
2	12.99	2	2-3 business days	12.99	2	2-3 business days
3	24.99	1	Next business day	24.99	1	Next business day
4	35.0	10	7-14 business days	35.0	10	7-14 business days

All 4 passes — pass 1 is the card above
pass	`method`
1	STANDARD
2	EXPRESS
3	OVERNIGHT
4	INTERNATIONAL

All 8 passes — pass 1 is the card above
pass	`weightPounds`
1	20.0
2	20.0
3	20.0
4	20.0
5	5.0
6	5.0
7	5.0
8	5.0

14 passes — pass 1 is the card above
pass	`weightPounds`
1	20.0
2	20.0
3	20.0
4	20.0
5	5.0
6	5.0
7	5.0
8	5.0
9	5.0
⋯ 3 more passes ⋯
13	5.0
14	5.0

All 8 passes — pass 1 is the card above
pass	`baseCost`	`weightPounds`
1	5.99	20.0
2	12.99	20.0
3	5.99	5.0
4	5.99	5.0
5	12.99	5.0
6	5.99	5.0
7	12.99	5.0
8	5.99	5.0

All 4 passes — pass 1 is the card above
pass	`description`
1	5-7 business days
2	2-3 business days
3	Next business day
4	7-14 business days

All 3 passes — pass 1 is the card above
pass	`weightPounds`
1	20.0
2	5.0
3	5.0

Combine fields, constructors, methods - enum as a full data type.

Abstract methods per constant

Each constant provides its own implementation.

                            operator
                            operator = Operation.MULTIPLY (default)operator = Operation.PLUSoperator = Operation.DIVIDE
                        

                            AbstractMethod.java
                        
Replay: real traced execution (multi-file project)

                            // Enum with abstract methods (per-constant behavior)
// Concept: abstract method in enum
// Concept: per-constant behavior

enum Operation {
    PLUS("+") {
        @Override
        public double apply(double x, double y) {
            return x + y;
        }
    },
    MINUS("-") {
        @Override
        public double apply(double x, double y) {
            return x - y;
        }
    },
    MULTIPLY("*") {
        @Override
        public double apply(double x, double y) {
            return x * y;
        }
    },
    DIVIDE("/") {
        @Override
        public double apply(double x, double y) {
            return x / y;
        }
    };

    private final String symbol;

    Operation(String symbol) {
        this.symbol = symbol;
    }

    // Abstract method - each constant must implement
    public abstract double apply(double x, double y);

    public String getSymbol() {
        return symbol;
    }
}

public class AbstractMethod {
    public static void main(String[] args) {
        // Use operations
        double a = 10;
        double b = 3;

        System.out.println("Calculate: a=" + a + ", b=" + b + "\n");

        for (Operation op : Operation.values()) {
            double result = op.apply(a, b);
            System.out.printf("%s %s %s = %.2f%n",
                a, op.getSymbol(), b, result);
        }


        // Build calculator
        Operation operator = Operation.MULTIPLY;
        double x = 7;
        double y = 6;

        double answer = operator.apply(x, y);
        System.out.printf("\n%.0f %s %.0f = %.0f%n",
            x, operator.getSymbol(), y, answer);

        // Evaluate expressions
        class Expression {
            double left;
            Operation op;
            double right;

            Expression(double left, Operation op, double right) {
                this.left = left;
                this.op = op;
                this.right = right;
            }

            double evaluate() {
                return op.apply(left, right);
            }

            public String toString() {
                return String.format("%.0f %s %.0f = %.2f",
                    left, op.getSymbol(), right, evaluate());
            }
        }

        Expression[] expressions = {
            new Expression(100, Operation.PLUS, 50),
            new Expression(100, Operation.MINUS, 50),
            new Expression(100, Operation.MULTIPLY, 50),
            new Expression(100, Operation.DIVIDE, 50)
        };

        System.out.println("\nExpressions:");
        for (Expression expr : expressions) {
            System.out.println("  " + expr);
        }

    }
}
// Enum with abstract methods (per-constant behavior)
// Concept: abstract method in enum
// Concept: per-constant behavior

enum Operation {
    PLUS("+") {
        @Override
        public double apply(double x, double y) {
            return x + y;
        }
    },
    MINUS("-") {
        @Override
        public double apply(double x, double y) {
            return x - y;
        }
    },
    MULTIPLY("*") {
        @Override
        public double apply(double x, double y) {
            return x * y;
        }
    },
    DIVIDE("/") {
        @Override
        public double apply(double x, double y) {
            return x / y;
        }
    };

    private final String symbol;

    Operation(String symbol) {
        this.symbol = symbol;
    }

    // Abstract method - each constant must implement
    public abstract double apply(double x, double y);

    public String getSymbol() {
        return symbol;
    }
}

public class AbstractMethod {
    public static void main(String[] args) {
        // Use operations
        double a = 10;
        double b = 3;

        System.out.println("Calculate: a=" + a + ", b=" + b + "\n");

        for (Operation op : Operation.values()) {
            double result = op.apply(a, b);
            System.out.printf("%s %s %s = %.2f%n",
                a, op.getSymbol(), b, result);
        }


        // Build calculator
        Operation operator = Operation.PLUS;
        double x = 7;
        double y = 6;

        double answer = operator.apply(x, y);
        System.out.printf("\n%.0f %s %.0f = %.0f%n",
            x, operator.getSymbol(), y, answer);

        // Evaluate expressions
        class Expression {
            double left;
            Operation op;
            double right;

            Expression(double left, Operation op, double right) {
                this.left = left;
                this.op = op;
                this.right = right;
            }

            double evaluate() {
                return op.apply(left, right);
            }

            public String toString() {
                return String.format("%.0f %s %.0f = %.2f",
                    left, op.getSymbol(), right, evaluate());
            }
        }

        Expression[] expressions = {
            new Expression(100, Operation.PLUS, 50),
            new Expression(100, Operation.MINUS, 50),
            new Expression(100, Operation.MULTIPLY, 50),
            new Expression(100, Operation.DIVIDE, 50)
        };

        System.out.println("\nExpressions:");
        for (Expression expr : expressions) {
            System.out.println("  " + expr);
        }

    }
}
// Enum with abstract methods (per-constant behavior)
// Concept: abstract method in enum
// Concept: per-constant behavior

enum Operation {
    PLUS("+") {
        @Override
        public double apply(double x, double y) {
            return x + y;
        }
    },
    MINUS("-") {
        @Override
        public double apply(double x, double y) {
            return x - y;
        }
    },
    MULTIPLY("*") {
        @Override
        public double apply(double x, double y) {
            return x * y;
        }
    },
    DIVIDE("/") {
        @Override
        public double apply(double x, double y) {
            return x / y;
        }
    };

    private final String symbol;

    Operation(String symbol) {
        this.symbol = symbol;
    }

    // Abstract method - each constant must implement
    public abstract double apply(double x, double y);

    public String getSymbol() {
        return symbol;
    }
}

public class AbstractMethod {
    public static void main(String[] args) {
        // Use operations
        double a = 10;
        double b = 3;

        System.out.println("Calculate: a=" + a + ", b=" + b + "\n");

        for (Operation op : Operation.values()) {
            double result = op.apply(a, b);
            System.out.printf("%s %s %s = %.2f%n",
                a, op.getSymbol(), b, result);
        }


        // Build calculator
        Operation operator = Operation.DIVIDE;
        double x = 7;
        double y = 6;

        double answer = operator.apply(x, y);
        System.out.printf("\n%.0f %s %.0f = %.0f%n",
            x, operator.getSymbol(), y, answer);

        // Evaluate expressions
        class Expression {
            double left;
            Operation op;
            double right;

            Expression(double left, Operation op, double right) {
                this.left = left;
                this.op = op;
                this.right = right;
            }

            double evaluate() {
                return op.apply(left, right);
            }

            public String toString() {
                return String.format("%.0f %s %.0f = %.2f",
                    left, op.getSymbol(), right, evaluate());
            }
        }

        Expression[] expressions = {
            new Expression(100, Operation.PLUS, 50),
            new Expression(100, Operation.MINUS, 50),
            new Expression(100, Operation.MULTIPLY, 50),
            new Expression(100, Operation.DIVIDE, 50)
        };

        System.out.println("\nExpressions:");
        for (Expression expr : expressions) {
            System.out.println("  " + expr);
        }

    }
}

                        
1a ← 10.0, b ← 3.0⋯45public class AbstractMethod {46    public static void main(String[] args) {47        // Use operations48        double a→ 10.0 = 10;49        double b→ 3.0 = 3;50        51        System.out.println("Calculate: a=" + a10.0 + ", b=" + b3.0 + "\n");⋯outputCalculate: a=10.0, b=3.0
2this.symbol ← +pass 1 of 4⋯33Operation(String symbol+) {34    this.symbol→ + = symbol+;35}⋯All 4 passes — pass 1 is the card abovepasssymbolthis.symbol
1++
2--
3**
4//
3for (Operation op : Operation.values())pass 1 of 4⋯53for (Operation opPLUS : Operation.values()) {54    double result = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",⋯All 4 passes — pass 1 is the card abovepassop
1PLUS
2MINUS
3MULTIPLY
4DIVIDE
4@Override
        public double apply(double x, double y)pass 1 of 8⋯6PLUS("+") {7    @Override8    public double apply(double x10.0, double y3.0) {9        return x10.0 + y3.0;10    }⋯All 8 passes — pass 1 is the card abovepassxy
110.03.0
2100.050.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
5result ← 13.0⋯53for (Operation op : Operation.values()) {54    double result→ 13.0 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result13.0);57}⋯
6public String getSymbol()pass 1 of 33⋯40public String getSymbol() {41    return symbol+;42}⋯33 passes — pass 1 is the card abovepasssymbol
1+
2-
3*
4/
5*
6+
7+
8+
9+
⋯ 22 more passes ⋯
32/
33/
7a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result13.0);57}⋯
8@Override
        public double apply(double x, double y)pass 1 of 8⋯12MINUS("-") {13    @Override14    public double apply(double x10.0, double y3.0) {15        return x10.0 - y3.0;16    }⋯All 8 passes — pass 1 is the card abovepassxy
110.03.0
2100.050.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
9result ← 7.0⋯53for (Operation op : Operation.values()) {54    double result→ 7.0 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result7.0);57}⋯
10a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result7.0);57}⋯
11@Override
        public double apply(double x, double y)pass 1 of 9⋯18MULTIPLY("*") {19    @Override20    public double apply(double x10.0, double y3.0) {21        return x10.0 * y3.0;22    }⋯All 9 passes — pass 1 is the card abovepassxy
110.03.0
27.06.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
9100.050.0
12result ← 30.0⋯53for (Operation op : Operation.values()) {54    double result→ 30.0 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result30.0);57}⋯
13a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result30.0);57}⋯
14@Override
        public double apply(double x, double y)pass 1 of 8⋯24DIVIDE("/") {25    @Override26    public double apply(double x10.0, double y3.0) {27        return x10.0 / y3.0;28    }⋯All 8 passes — pass 1 is the card abovepassxy
110.03.0
2100.050.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
15result ← 3.3333333333333335⋯53for (Operation op : Operation.values()) {54    double result→ 3.3333333333333335 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result3.3333333333333335);57}⋯
16a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result3.3333333333333335);57}⋯
17operator ← MULTIPLY, x ← 7.0, y ← 6.0⋯65// Build calculator66Operation operator→ MULTIPLY = Operation.MULTIPLY;67//@operator=Operation.MULTIPLY, Operation.PLUS, Operation.DIVIDE68double x→ 7.0 = 7;69double y→ 6.0 = 6;7071double answer = operator.apply(x7.0, y6.0);72System.out.printf("\n%.0f %s %.0f = %.0f%n",⋯
18answer ← 42.0⋯71double answer→ 42.0 = operator.apply(x7.0, y6.0);72System.out.printf("\n%.0f %s %.0f = %.0f%n",73    x7.0, operator.getSymbol(), y6.0, answer42.0);⋯
19x, operator.getSymbol(), y, answer);⋯71double answer = operator.apply(x, y);72System.out.printf("\n%.0f %s %.0f = %.0f%n",73    x7.0, operator.getSymbol(), y6.0, answer42.0);7475// Evaluate expressions76class Expression {77    double left;78    Operation op;79    double right;80    81    Expression(double left, Operation op, double right) {82        this.left = left;83        this.op = op;84        this.right = right;85    }86    87    double evaluate() {88        return op.apply(left, right);89    }90    91    public String toString() {92        return String.format("%.0f %s %.0f = %.2f",93            left, op.getSymbol(), right, evaluate());94    }95}9697Expression[] expressions = {98    new Expression(100, Operation.PLUS, 50),99    new Expression(100, Operation.MINUS, 50),100    new Expression(100, Operation.MULTIPLY, 50),101    new Expression(100, Operation.DIVIDE, 50)102};⋯
20this.left ← 100.0, this.op ← PLUS, this.right ← 50.0pass 1 of 4⋯81Expression(double left100.0, Operation opPLUS, double right50.0) {82    this.left→ 100.0 = left100.0;83    this.op→ PLUS = opPLUS;84    this.right→ 50.0 = right50.0;85}⋯All 4 passes — pass 1 is the card abovepassopthis.leftthis.opthis.right
1PLUS100.0PLUS50.0
2MINUS100.0MINUS50.0
3MULTIPLY100.0MULTIPLY50.0
4DIVIDE100.0DIVIDE50.0
21Expression[] expressions =⋯97Expression[] expressions = {98    new Expression(100, Operation.PLUS, 50),99    new Expression(100, Operation.MINUS, 50),100    new Expression(100, Operation.MULTIPLY, 50),101    new Expression(100, Operation.DIVIDE, 50)102};103104System.out.println("\nExpressions:");105for (Expression expr : expressions) {⋯output
Expressions:
22double evaluate()pass 1 of 28⋯87double evaluate() {88    return op.apply(left100.0, right50.0);89}⋯
23for (Expression expr : expressions)pass 1 of 4⋯104System.out.println("\nExpressions:");105for (Expression expr100 + 50 = 150.00 : expressions) {106    System.out.println("  " + expr);⋯All 4 passes — pass 1 is the card abovepassexpr
1100 + 50 = 150.00
2100 - 50 = 50.00
3100 * 50 = 5000.00
4100 / 50 = 2.00
24System.out.println("  " + expr);⋯105for (Expression expr : expressions) {106    System.out.println("  " + expr100 + 50 = 150.00);107}⋯
25System.out.println("  " + expr);⋯105for (Expression expr : expressions) {106    System.out.println("  " + expr100 + 50 = 150.00);107}⋯output  100 + 50 = 150.00
26System.out.println("  " + expr);⋯105for (Expression expr : expressions) {106    System.out.println("  " + expr100 - 50 = 50.00);107}⋯
27System.out.println("  " + expr);⋯105for (Expression expr : expressions) {106    System.out.println("  " + expr100 - 50 = 50.00);107}⋯output  100 - 50 = 50.00
28System.out.println("  " + expr);⋯105for (Expression expr : expressions) {106    System.out.println("  " + expr100 * 50 = 5000.00);107}⋯
29System.out.println("  " + expr);⋯105for (Expression expr : expressions) {106    System.out.println("  " + expr100 * 50 = 5000.00);107}⋯output  100 * 50 = 5000.00
30System.out.println("  " + expr);⋯105for (Expression expr : expressions) {106    System.out.println("  " + expr100 / 50 = 2.00);107}⋯
31System.out.println("  " + expr);⋯105for (Expression expr : expressions) {106    System.out.println("  " + expr100 / 50 = 2.00);107}⋯output  100 / 50 = 2.00
1a ← 10.0, b ← 3.0⋯45public class AbstractMethod {46    public static void main(String[] args) {47        // Use operations48        double a→ 10.0 = 10;49        double b→ 3.0 = 3;50        51        System.out.println("Calculate: a=" + a10.0 + ", b=" + b3.0 + "\n");⋯outputCalculate: a=10.0, b=3.0
2this.symbol ← +pass 1 of 4⋯33Operation(String symbol+) {34    this.symbol→ + = symbol+;35}⋯All 4 passes — pass 1 is the card abovepasssymbolthis.symbol
1++
2--
3**
4//
3for (Operation op : Operation.values())pass 1 of 4⋯53for (Operation opPLUS : Operation.values()) {54    double result = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",⋯All 4 passes — pass 1 is the card abovepassop
1PLUS
2MINUS
3MULTIPLY
4DIVIDE
4@Override
        public double apply(double x, double y)pass 1 of 9⋯6PLUS("+") {7    @Override8    public double apply(double x10.0, double y3.0) {9        return x10.0 + y3.0;10    }⋯All 9 passes — pass 1 is the card abovepassxy
110.03.0
27.06.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
9100.050.0
5result ← 13.0⋯53for (Operation op : Operation.values()) {54    double result→ 13.0 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result13.0);57}⋯
6public String getSymbol()pass 1 of 33⋯40public String getSymbol() {41    return symbol+;42}⋯33 passes — pass 1 is the card abovepasssymbol
1+
2-
3*
4/
5+
6+
7+
8+
9+
⋯ 22 more passes ⋯
32/
33/
7a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result13.0);57}⋯
8@Override
        public double apply(double x, double y)pass 1 of 8⋯12MINUS("-") {13    @Override14    public double apply(double x10.0, double y3.0) {15        return x10.0 - y3.0;16    }⋯All 8 passes — pass 1 is the card abovepassxy
110.03.0
2100.050.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
9result ← 7.0⋯53for (Operation op : Operation.values()) {54    double result→ 7.0 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result7.0);57}⋯
10a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result7.0);57}⋯
11@Override
        public double apply(double x, double y)pass 1 of 8⋯18MULTIPLY("*") {19    @Override20    public double apply(double x10.0, double y3.0) {21        return x10.0 * y3.0;22    }⋯All 8 passes — pass 1 is the card abovepassxy
110.03.0
2100.050.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
12result ← 30.0⋯53for (Operation op : Operation.values()) {54    double result→ 30.0 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result30.0);57}⋯
13a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result30.0);57}⋯
14@Override
        public double apply(double x, double y)pass 1 of 8⋯24DIVIDE("/") {25    @Override26    public double apply(double x10.0, double y3.0) {27        return x10.0 / y3.0;28    }⋯All 8 passes — pass 1 is the card abovepassxy
110.03.0
2100.050.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
15result ← 3.3333333333333335⋯53for (Operation op : Operation.values()) {54    double result→ 3.3333333333333335 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result3.3333333333333335);57}⋯
16a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result3.3333333333333335);57}⋯
17operator ← PLUS, x ← 7.0, y ← 6.0⋯60// Build calculator61Operation operator→ PLUS = Operation.PLUS;62double x→ 7.0 = 7;63double y→ 6.0 = 6;6465double answer = operator.apply(x7.0, y6.0);66System.out.printf("\n%.0f %s %.0f = %.0f%n",⋯
18answer ← 13.0⋯65double answer→ 13.0 = operator.apply(x7.0, y6.0);66System.out.printf("\n%.0f %s %.0f = %.0f%n",67    x7.0, operator.getSymbol(), y6.0, answer13.0);⋯
19x, operator.getSymbol(), y, answer);⋯65double answer = operator.apply(x, y);66System.out.printf("\n%.0f %s %.0f = %.0f%n",67    x7.0, operator.getSymbol(), y6.0, answer13.0);6869// Evaluate expressions70class Expression {71    double left;72    Operation op;73    double right;74    75    Expression(double left, Operation op, double right) {76        this.left = left;77        this.op = op;78        this.right = right;79    }80    81    double evaluate() {82        return op.apply(left, right);83    }84    85    public String toString() {86        return String.format("%.0f %s %.0f = %.2f",87            left, op.getSymbol(), right, evaluate());88    }89}9091Expression[] expressions = {92    new Expression(100, Operation.PLUS, 50),93    new Expression(100, Operation.MINUS, 50),94    new Expression(100, Operation.MULTIPLY, 50),95    new Expression(100, Operation.DIVIDE, 50)96};⋯
20this.left ← 100.0, this.op ← PLUS, this.right ← 50.0pass 1 of 4⋯75Expression(double left100.0, Operation opPLUS, double right50.0) {76    this.left→ 100.0 = left100.0;77    this.op→ PLUS = opPLUS;78    this.right→ 50.0 = right50.0;79}⋯All 4 passes — pass 1 is the card abovepassopthis.leftthis.opthis.right
1PLUS100.0PLUS50.0
2MINUS100.0MINUS50.0
3MULTIPLY100.0MULTIPLY50.0
4DIVIDE100.0DIVIDE50.0
21Expression[] expressions =⋯91Expression[] expressions = {92    new Expression(100, Operation.PLUS, 50),93    new Expression(100, Operation.MINUS, 50),94    new Expression(100, Operation.MULTIPLY, 50),95    new Expression(100, Operation.DIVIDE, 50)96};9798System.out.println("\nExpressions:");99for (Expression expr : expressions) {⋯output
Expressions:
22double evaluate()pass 1 of 28⋯81double evaluate() {82    return op.apply(left100.0, right50.0);83}⋯
23for (Expression expr : expressions)pass 1 of 4⋯98System.out.println("\nExpressions:");99for (Expression expr100 + 50 = 150.00 : expressions) {100    System.out.println("  " + expr);⋯All 4 passes — pass 1 is the card abovepassexpr
1100 + 50 = 150.00
2100 - 50 = 50.00
3100 * 50 = 5000.00
4100 / 50 = 2.00
24System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 + 50 = 150.00);101}⋯
25System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 + 50 = 150.00);101}⋯output  100 + 50 = 150.00
26System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 - 50 = 50.00);101}⋯
27System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 - 50 = 50.00);101}⋯output  100 - 50 = 50.00
28System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 * 50 = 5000.00);101}⋯
29System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 * 50 = 5000.00);101}⋯output  100 * 50 = 5000.00
30System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 / 50 = 2.00);101}⋯
31System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 / 50 = 2.00);101}⋯output  100 / 50 = 2.00
1a ← 10.0, b ← 3.0⋯45public class AbstractMethod {46    public static void main(String[] args) {47        // Use operations48        double a→ 10.0 = 10;49        double b→ 3.0 = 3;50        51        System.out.println("Calculate: a=" + a10.0 + ", b=" + b3.0 + "\n");⋯outputCalculate: a=10.0, b=3.0
2this.symbol ← +pass 1 of 4⋯33Operation(String symbol+) {34    this.symbol→ + = symbol+;35}⋯All 4 passes — pass 1 is the card abovepasssymbolthis.symbol
1++
2--
3**
4//
3for (Operation op : Operation.values())pass 1 of 4⋯53for (Operation opPLUS : Operation.values()) {54    double result = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",⋯All 4 passes — pass 1 is the card abovepassop
1PLUS
2MINUS
3MULTIPLY
4DIVIDE
4@Override
        public double apply(double x, double y)pass 1 of 8⋯6PLUS("+") {7    @Override8    public double apply(double x10.0, double y3.0) {9        return x10.0 + y3.0;10    }⋯All 8 passes — pass 1 is the card abovepassxy
110.03.0
2100.050.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
5result ← 13.0⋯53for (Operation op : Operation.values()) {54    double result→ 13.0 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result13.0);57}⋯
6public String getSymbol()pass 1 of 33⋯40public String getSymbol() {41    return symbol+;42}⋯33 passes — pass 1 is the card abovepasssymbol
1+
2-
3*
4/
5/
6+
7+
8+
9+
⋯ 22 more passes ⋯
32/
33/
7a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result13.0);57}⋯
8@Override
        public double apply(double x, double y)pass 1 of 8⋯12MINUS("-") {13    @Override14    public double apply(double x10.0, double y3.0) {15        return x10.0 - y3.0;16    }⋯All 8 passes — pass 1 is the card abovepassxy
110.03.0
2100.050.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
9result ← 7.0⋯53for (Operation op : Operation.values()) {54    double result→ 7.0 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result7.0);57}⋯
10a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result7.0);57}⋯
11@Override
        public double apply(double x, double y)pass 1 of 8⋯18MULTIPLY("*") {19    @Override20    public double apply(double x10.0, double y3.0) {21        return x10.0 * y3.0;22    }⋯All 8 passes — pass 1 is the card abovepassxy
110.03.0
2100.050.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
12result ← 30.0⋯53for (Operation op : Operation.values()) {54    double result→ 30.0 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result30.0);57}⋯
13a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result30.0);57}⋯
14@Override
        public double apply(double x, double y)pass 1 of 9⋯24DIVIDE("/") {25    @Override26    public double apply(double x10.0, double y3.0) {27        return x10.0 / y3.0;28    }⋯All 9 passes — pass 1 is the card abovepassxy
110.03.0
27.06.0
3100.050.0
4100.050.0
5100.050.0
6100.050.0
7100.050.0
8100.050.0
9100.050.0
15result ← 3.3333333333333335⋯53for (Operation op : Operation.values()) {54    double result→ 3.3333333333333335 = op.apply(a10.0, b3.0);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result3.3333333333333335);57}⋯
16a, op.getSymbol(), b, result);⋯54    double result = op.apply(a, b);55    System.out.printf("%s %s %s = %.2f%n",56        a10.0, op.getSymbol(), b3.0, result3.3333333333333335);57}⋯
17operator ← DIVIDE, x ← 7.0, y ← 6.0⋯60// Build calculator61Operation operator→ DIVIDE = Operation.DIVIDE;62double x→ 7.0 = 7;63double y→ 6.0 = 6;6465double answer = operator.apply(x7.0, y6.0);66System.out.printf("\n%.0f %s %.0f = %.0f%n",⋯
18answer ← 1.1666666666666667⋯65double answer→ 1.1666666666666667 = operator.apply(x7.0, y6.0);66System.out.printf("\n%.0f %s %.0f = %.0f%n",67    x7.0, operator.getSymbol(), y6.0, answer1.1666666666666667);⋯
19x, operator.getSymbol(), y, answer);⋯65double answer = operator.apply(x, y);66System.out.printf("\n%.0f %s %.0f = %.0f%n",67    x7.0, operator.getSymbol(), y6.0, answer1.1666666666666667);6869// Evaluate expressions70class Expression {71    double left;72    Operation op;73    double right;74    75    Expression(double left, Operation op, double right) {76        this.left = left;77        this.op = op;78        this.right = right;79    }80    81    double evaluate() {82        return op.apply(left, right);83    }84    85    public String toString() {86        return String.format("%.0f %s %.0f = %.2f",87            left, op.getSymbol(), right, evaluate());88    }89}9091Expression[] expressions = {92    new Expression(100, Operation.PLUS, 50),93    new Expression(100, Operation.MINUS, 50),94    new Expression(100, Operation.MULTIPLY, 50),95    new Expression(100, Operation.DIVIDE, 50)96};⋯
20this.left ← 100.0, this.op ← PLUS, this.right ← 50.0pass 1 of 4⋯75Expression(double left100.0, Operation opPLUS, double right50.0) {76    this.left→ 100.0 = left100.0;77    this.op→ PLUS = opPLUS;78    this.right→ 50.0 = right50.0;79}⋯All 4 passes — pass 1 is the card abovepassopthis.leftthis.opthis.right
1PLUS100.0PLUS50.0
2MINUS100.0MINUS50.0
3MULTIPLY100.0MULTIPLY50.0
4DIVIDE100.0DIVIDE50.0
21Expression[] expressions =⋯91Expression[] expressions = {92    new Expression(100, Operation.PLUS, 50),93    new Expression(100, Operation.MINUS, 50),94    new Expression(100, Operation.MULTIPLY, 50),95    new Expression(100, Operation.DIVIDE, 50)96};9798System.out.println("\nExpressions:");99for (Expression expr : expressions) {⋯output
Expressions:
22double evaluate()pass 1 of 28⋯81double evaluate() {82    return op.apply(left100.0, right50.0);83}⋯
23for (Expression expr : expressions)pass 1 of 4⋯98System.out.println("\nExpressions:");99for (Expression expr100 + 50 = 150.00 : expressions) {100    System.out.println("  " + expr);⋯All 4 passes — pass 1 is the card abovepassexpr
1100 + 50 = 150.00
2100 - 50 = 50.00
3100 * 50 = 5000.00
4100 / 50 = 2.00
24System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 + 50 = 150.00);101}⋯
25System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 + 50 = 150.00);101}⋯output  100 + 50 = 150.00
26System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 - 50 = 50.00);101}⋯
27System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 - 50 = 50.00);101}⋯output  100 - 50 = 50.00
28System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 * 50 = 5000.00);101}⋯
29System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 * 50 = 5000.00);101}⋯output  100 * 50 = 5000.00
30System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 / 50 = 2.00);101}⋯
31System.out.println("  " + expr);⋯99for (Expression expr : expressions) {100    System.out.println("  " + expr100 / 50 = 2.00);101}⋯output  100 / 50 = 2.00

abstract method in enum - each constant implements differently.

constant-specific method Each enum constant can override methods with its own implementation.

Enum implementing interface

Enums can implement interfaces.

                            searchCode
                            searchCode = 404 (default)searchCode = 200searchCode = 500
                        

                            ImplementingInterface.java
                        
Replay: real traced execution (multi-file project)

                            // Enum implementing interface
// Concept: enum implements interface
// Concept: polymorphism with enum

interface Describable {
    String getDescription();
    String getDetails();
}

// Enum implementing interface
enum HttpStatus implements Describable {
    OK(200, "Success"),
    CREATED(201, "Resource created"),
    BAD_REQUEST(400, "Invalid request"),
    NOT_FOUND(404, "Resource not found"),
    SERVER_ERROR(500, "Internal error");

    private final int code;
    private final String message;

    HttpStatus(int code, String message) {
        this.code = code;
        this.message = message;
    }

    // Implement interface methods
    @Override
    public String getDescription() {
        return code + " " + name();
    }

    @Override
    public String getDetails() {
        return message;
    }

    // Enum-specific methods
    public int getCode() {
        return code;
    }

    public boolean isSuccess() {
        return code >= 200 && code < 300;
    }

    public boolean isError() {
        return code >= 400;
    }
}

public class ImplementingInterface {
    public static void main(String[] args) {
        // Use enum as interface type
        Describable status = HttpStatus.OK;

        System.out.println("Description: " + status.getDescription());
        System.out.println("Details: " + status.getDetails());


        // Check status types
        HttpStatus[] responses = {
            HttpStatus.OK,
            HttpStatus.NOT_FOUND,
            HttpStatus.SERVER_ERROR,
            HttpStatus.CREATED
        };

        System.out.println("\nAnalyzing responses:");
        for (HttpStatus resp : responses) {
            String type = resp.isSuccess() ? "SUCCESS" :
                         resp.isError() ? "ERROR" : "INFO";
            System.out.printf("%d %s: %s [%s]%n",
                resp.getCode(),
                resp.name(),
                resp.getDetails(),
                type);
        }

        // Polymorphic processing
        System.out.println("\nPolymorphic usage:");
        printDescribable(HttpStatus.BAD_REQUEST);

        // Filter by criteria
        System.out.println("\nError statuses:");
        for (HttpStatus s : HttpStatus.values()) {
            if (s.isError()) {
                System.out.println("  " + s.getDescription());
            }
        }

        System.out.println("\nSuccess statuses:");
        for (HttpStatus s : HttpStatus.values()) {
            if (s.isSuccess()) {
                System.out.println("  " + s.getDescription());
            }
        }

        // Find by code
        int searchCode = 404;
        HttpStatus found = null;

        for (HttpStatus s : HttpStatus.values()) {
            if (s.getCode() == searchCode) {
                found = s;
                break;
            }
        }

        if (found != null) {
            System.out.println("\nCode " + searchCode + ": " + found.getDetails());
        }

    }

    static void printDescribable(Describable d) {
        System.out.println("  " + d.getDescription());
        System.out.println("  " + d.getDetails());
    }
}
// Enum implementing interface
// Concept: enum implements interface
// Concept: polymorphism with enum

interface Describable {
    String getDescription();
    String getDetails();
}

// Enum implementing interface
enum HttpStatus implements Describable {
    OK(200, "Success"),
    CREATED(201, "Resource created"),
    BAD_REQUEST(400, "Invalid request"),
    NOT_FOUND(404, "Resource not found"),
    SERVER_ERROR(500, "Internal error");

    private final int code;
    private final String message;

    HttpStatus(int code, String message) {
        this.code = code;
        this.message = message;
    }

    // Implement interface methods
    @Override
    public String getDescription() {
        return code + " " + name();
    }

    @Override
    public String getDetails() {
        return message;
    }

    // Enum-specific methods
    public int getCode() {
        return code;
    }

    public boolean isSuccess() {
        return code >= 200 && code < 300;
    }

    public boolean isError() {
        return code >= 400;
    }
}

public class ImplementingInterface {
    public static void main(String[] args) {
        // Use enum as interface type
        Describable status = HttpStatus.OK;

        System.out.println("Description: " + status.getDescription());
        System.out.println("Details: " + status.getDetails());


        // Check status types
        HttpStatus[] responses = {
            HttpStatus.OK,
            HttpStatus.NOT_FOUND,
            HttpStatus.SERVER_ERROR,
            HttpStatus.CREATED
        };

        System.out.println("\nAnalyzing responses:");
        for (HttpStatus resp : responses) {
            String type = resp.isSuccess() ? "SUCCESS" :
                         resp.isError() ? "ERROR" : "INFO";
            System.out.printf("%d %s: %s [%s]%n",
                resp.getCode(),
                resp.name(),
                resp.getDetails(),
                type);
        }

        // Polymorphic processing
        System.out.println("\nPolymorphic usage:");
        printDescribable(HttpStatus.BAD_REQUEST);

        // Filter by criteria
        System.out.println("\nError statuses:");
        for (HttpStatus s : HttpStatus.values()) {
            if (s.isError()) {
                System.out.println("  " + s.getDescription());
            }
        }

        System.out.println("\nSuccess statuses:");
        for (HttpStatus s : HttpStatus.values()) {
            if (s.isSuccess()) {
                System.out.println("  " + s.getDescription());
            }
        }

        // Find by code
        int searchCode = 200;
        HttpStatus found = null;

        for (HttpStatus s : HttpStatus.values()) {
            if (s.getCode() == searchCode) {
                found = s;
                break;
            }
        }

        if (found != null) {
            System.out.println("\nCode " + searchCode + ": " + found.getDetails());
        }

    }

    static void printDescribable(Describable d) {
        System.out.println("  " + d.getDescription());
        System.out.println("  " + d.getDetails());
    }
}
// Enum implementing interface
// Concept: enum implements interface
// Concept: polymorphism with enum

interface Describable {
    String getDescription();
    String getDetails();
}

// Enum implementing interface
enum HttpStatus implements Describable {
    OK(200, "Success"),
    CREATED(201, "Resource created"),
    BAD_REQUEST(400, "Invalid request"),
    NOT_FOUND(404, "Resource not found"),
    SERVER_ERROR(500, "Internal error");

    private final int code;
    private final String message;

    HttpStatus(int code, String message) {
        this.code = code;
        this.message = message;
    }

    // Implement interface methods
    @Override
    public String getDescription() {
        return code + " " + name();
    }

    @Override
    public String getDetails() {
        return message;
    }

    // Enum-specific methods
    public int getCode() {
        return code;
    }

    public boolean isSuccess() {
        return code >= 200 && code < 300;
    }

    public boolean isError() {
        return code >= 400;
    }
}

public class ImplementingInterface {
    public static void main(String[] args) {
        // Use enum as interface type
        Describable status = HttpStatus.OK;

        System.out.println("Description: " + status.getDescription());
        System.out.println("Details: " + status.getDetails());


        // Check status types
        HttpStatus[] responses = {
            HttpStatus.OK,
            HttpStatus.NOT_FOUND,
            HttpStatus.SERVER_ERROR,
            HttpStatus.CREATED
        };

        System.out.println("\nAnalyzing responses:");
        for (HttpStatus resp : responses) {
            String type = resp.isSuccess() ? "SUCCESS" :
                         resp.isError() ? "ERROR" : "INFO";
            System.out.printf("%d %s: %s [%s]%n",
                resp.getCode(),
                resp.name(),
                resp.getDetails(),
                type);
        }

        // Polymorphic processing
        System.out.println("\nPolymorphic usage:");
        printDescribable(HttpStatus.BAD_REQUEST);

        // Filter by criteria
        System.out.println("\nError statuses:");
        for (HttpStatus s : HttpStatus.values()) {
            if (s.isError()) {
                System.out.println("  " + s.getDescription());
            }
        }

        System.out.println("\nSuccess statuses:");
        for (HttpStatus s : HttpStatus.values()) {
            if (s.isSuccess()) {
                System.out.println("  " + s.getDescription());
            }
        }

        // Find by code
        int searchCode = 500;
        HttpStatus found = null;

        for (HttpStatus s : HttpStatus.values()) {
            if (s.getCode() == searchCode) {
                found = s;
                break;
            }
        }

        if (found != null) {
            System.out.println("\nCode " + searchCode + ": " + found.getDetails());
        }

    }

    static void printDescribable(Describable d) {
        System.out.println("  " + d.getDescription());
        System.out.println("  " + d.getDetails());
    }
}

                        
1public static void main(String[] args)⋯51public class ImplementingInterface {52    public static void main(String[] args) {53        // Use enum as interface type54        Describable status = HttpStatus.OK;⋯
2this.code ← 200, this.message ← Successpass 1 of 5⋯21HttpStatus(int code200, String messageSuccess) {22    this.code→ 200 = code200;23    this.message→ Success = messageSuccess;24}⋯All 5 passes — pass 1 is the card abovepasscodemessagethis.codethis.message
1200Success200Success
2201Resource created201Resource created
3400Invalid request400Invalid request
4404Resource not found404Resource not found
5500Internal error500Internal error
3status ← OK⋯53// Use enum as interface type54Describable status→ OK = HttpStatus.OK;5556System.out.println("Description: " + status.getDescription());57System.out.println("Details: " + status.getDetails());⋯
4@Override
    public String getDescription()pass 1 of 7⋯26// Implement interface methods27@Override28public String getDescription() {29    return code200 + " " + name();30}⋯All 7 passes — pass 1 is the card abovepasscode
1200
2400
3400
4404
5500
6200
7201
5System.out.println("Description: " + status.getDescription());⋯56System.out.println("Description: " + status.getDescription());57System.out.println("Details: " + status.getDetails());⋯outputDescription: 200 OK
6@Override
    public String getDetails()pass 1 of 7⋯32@Override33public String getDetails() {34    return messageSuccess;35}⋯All 7 passes — pass 1 is the card abovepassmessage
1Success
2Success
3Resource not found
4Internal error
5Resource created
6Invalid request
7Resource not found
7HttpStatus[] responses =⋯56System.out.println("Description: " + status.getDescription());57System.out.println("Details: " + status.getDetails());5859//@help h160// Enum can implement interfaces like any class61// Useful for polymorphic collections62// All enum constants must provide the implementation63//@end6465// Check status types66HttpStatus[] responses = {67    HttpStatus.OK,68    HttpStatus.NOT_FOUND,69    HttpStatus.SERVER_ERROR,70    HttpStatus.CREATED71};7273System.out.println("\nAnalyzing responses:");74for (HttpStatus resp : responses) {⋯outputDetails: Success

Analyzing responses:
8for (HttpStatus resp : responses)pass 1 of 4⋯73System.out.println("\nAnalyzing responses:");74for (HttpStatus respOK : responses) {75    String type = resp.isSuccess() ? "SUCCESS" :76                 resp.isError() ? "ERROR" : "INFO";77    System.out.printf("%d %s: %s [%s]%n",⋯All 4 passes — pass 1 is the card abovepassresp
1OK
2NOT_FOUND
3SERVER_ERROR
4CREATED
9public boolean isSuccess()pass 1 of 9⋯42public boolean isSuccess() {43    return code200 >= 200 && code < 300;44}⋯All 9 passes — pass 1 is the card abovepasscode
1200
2404
3500
4201
5200
6201
7400
8404
9500
10type ← SUCCESS⋯74for (HttpStatus resp : responses) {75    String type→ SUCCESS = resp.isSuccess() ? "SUCCESS" :76                 resp.isError() ? "ERROR" : "INFO";77    System.out.printf("%d %s: %s [%s]%n",78        resp.getCode(),79        resp.name(),80        resp.getDetails(),81        typeSUCCESS);82}⋯
11public int getCode()pass 1 of 8⋯37// Enum-specific methods38public int getCode() {39    return code200;40}⋯All 8 passes — pass 1 is the card abovepasscodesearchCodesfound
1200———
2404———
3500———
4201———
5200———
6201———
7400———
8404404NOT_FOUNDNOT_FOUND
12type);⋯76                 resp.isError() ? "ERROR" : "INFO";77    System.out.printf("%d %s: %s [%s]%n",78        resp.getCode(),79        resp.name(),80        resp.getDetails(),81        typeSUCCESS);82}⋯
13public boolean isError()pass 1 of 7⋯46public boolean isError() {47    return code404 >= 400;48}⋯All 7 passes — pass 1 is the card abovepasscode
1404
2500
3200
4201
5400
6404
7500
14type ← ERROR⋯74for (HttpStatus resp : responses) {75    String type→ ERROR = resp.isSuccess() ? "SUCCESS" :76                 resp.isError() ? "ERROR" : "INFO";77    System.out.printf("%d %s: %s [%s]%n",78        resp.getCode(),79        resp.name(),80        resp.getDetails(),81        typeERROR);82}⋯
15type);⋯76                 resp.isError() ? "ERROR" : "INFO";77    System.out.printf("%d %s: %s [%s]%n",78        resp.getCode(),79        resp.name(),80        resp.getDetails(),81        typeERROR);82}⋯
16type ← ERROR⋯74for (HttpStatus resp : responses) {75    String type→ ERROR = resp.isSuccess() ? "SUCCESS" :76                 resp.isError() ? "ERROR" : "INFO";77    System.out.printf("%d %s: %s [%s]%n",78        resp.getCode(),79        resp.name(),80        resp.getDetails(),81        typeERROR);82}⋯
17type);⋯76                 resp.isError() ? "ERROR" : "INFO";77    System.out.printf("%d %s: %s [%s]%n",78        resp.getCode(),79        resp.name(),80        resp.getDetails(),81        typeERROR);82}⋯
18type ← SUCCESS⋯74for (HttpStatus resp : responses) {75    String type→ SUCCESS = resp.isSuccess() ? "SUCCESS" :76                 resp.isError() ? "ERROR" : "INFO";77    System.out.printf("%d %s: %s [%s]%n",78        resp.getCode(),79        resp.name(),80        resp.getDetails(),81        typeSUCCESS);82}⋯
19type);⋯76                 resp.isError() ? "ERROR" : "INFO";77    System.out.printf("%d %s: %s [%s]%n",78        resp.getCode(),79        resp.name(),80        resp.getDetails(),81        typeSUCCESS);82}⋯
20System.out.println(" Polymorphic usage:");⋯84// Polymorphic processing85System.out.println("\nPolymorphic usage:");86printDescribable(HttpStatus.BAD_REQUEST);⋯output
Polymorphic usage:
21static void printDescribable(Describable d)⋯121static void printDescribable(Describable dBAD_REQUEST) {122    System.out.println("  " + d.getDescription());123    System.out.println("  " + d.getDetails());⋯
22System.out.println("  " + d.getDescription());⋯121static void printDescribable(Describable d) {122    System.out.println("  " + d.getDescription());123    System.out.println("  " + d.getDetails());124}⋯output  400 BAD_REQUEST
23System.out.println("  " + d.getDetails());⋯85    System.out.println("\nPolymorphic usage:");86    printDescribable(HttpStatus.BAD_REQUEST);87    88    // Filter by criteria89    System.out.println("\nError statuses:");90    for (HttpStatus s : HttpStatus.values()) {91        if (s.isError()) {92            System.out.println("  " + s.getDescription());93        }94    }95    96    System.out.println("\nSuccess statuses:");97    for (HttpStatus s : HttpStatus.values()) {98        if (s.isSuccess()) {99            System.out.println("  " + s.getDescription());100        }101    }102    103    // Find by code104    int searchCode = 404;105    //@searchCode=404, 200, 500106    HttpStatus found = null;107    108    for (HttpStatus s : HttpStatus.values()) {109        if (s.getCode() == searchCode) {110            found = s;111            break;112        }113    }114    115    if (found != null) {116        System.out.println("\nCode " + searchCode + ": " + found.getDetails());117    }118    119}120121static void printDescribable(Describable d) {122    System.out.println("  " + d.getDescription());123    System.out.println("  " + d.getDetails());124}⋯output  Invalid request

Error statuses:
24for (HttpStatus s : HttpStatus.values())pass 1 of 5⋯89System.out.println("\nError statuses:");90for (HttpStatus sOK : HttpStatus.values()) {91    if (s.isError()) {⋯All 5 passes — pass 1 is the card abovepasss
1OK
2CREATED
3BAD_REQUEST
4NOT_FOUND
5SERVER_ERROR
25System.out.println("  " + s.getDescription());⋯91if (s.isError()) {92    System.out.println("  " + s.getDescription());93}⋯output  400 BAD_REQUEST
26System.out.println("  " + s.getDescription());⋯91if (s.isError()) {92    System.out.println("  " + s.getDescription());93}⋯output  404 NOT_FOUND
27System.out.println("  " + s.getDescription());⋯91if (s.isError()) {92    System.out.println("  " + s.getDescription());93}⋯output  500 SERVER_ERROR
28System.out.println(" Success statuses:");⋯96System.out.println("\nSuccess statuses:");97for (HttpStatus s : HttpStatus.values()) {⋯output
Success statuses:
29for (HttpStatus s : HttpStatus.values())pass 1 of 5⋯96System.out.println("\nSuccess statuses:");97for (HttpStatus sOK : HttpStatus.values()) {98    if (s.isSuccess()) {⋯All 5 passes — pass 1 is the card abovepasss
1OK
2CREATED
3BAD_REQUEST
4NOT_FOUND
5SERVER_ERROR
30System.out.println("  " + s.getDescription());⋯98if (s.isSuccess()) {99    System.out.println("  " + s.getDescription());100}⋯output  200 OK
31System.out.println("  " + s.getDescription());⋯98if (s.isSuccess()) {99    System.out.println("  " + s.getDescription());100}⋯output  201 CREATED
32searchCode ← 404, found ← null⋯103// Find by code104int searchCode→ 404 = 404;105//@searchCode=404, 200, 500106HttpStatus found→ null = null;⋯
33for (HttpStatus s : HttpStatus.values())pass 1 of 4⋯108for (HttpStatus sOK : HttpStatus.values()) {109    if (s.getCode() == searchCode) {⋯All 4 passes — pass 1 is the card abovepassssearchCodefound
1OK——
2CREATED——
3BAD_REQUEST——
4NOT_FOUND404NOT_FOUND
34found ← NOT_FOUND⋯108for (HttpStatus s : HttpStatus.values()) {109    if (s.getCode() == searchCode404) {110        found→ NOT_FOUND = sNOT_FOUND;111        break;112    }⋯
35if (found != null)⋯115if (foundNOT_FOUND != null) {116    System.out.println("\nCode " + searchCode404 + ": " + found.getDetails());117}⋯
36System.out.println(" Code " + searchCode + ": " + found.getDetails());⋯115if (found != null) {116    System.out.println("\nCode " + searchCode404 + ": " + found.getDetails());117}⋯output
Code 404: Resource not found
1public static void main(String[] args)⋯51public class ImplementingInterface {52    public static void main(String[] args) {53        // Use enum as interface type54        Describable status = HttpStatus.OK;⋯
2this.code ← 200, this.message ← Successpass 1 of 5⋯21HttpStatus(int code200, String messageSuccess) {22    this.code→ 200 = code200;23    this.message→ Success = messageSuccess;24}⋯All 5 passes — pass 1 is the card abovepasscodemessagethis.codethis.message
1200Success200Success
2201Resource created201Resource created
3400Invalid request400Invalid request
4404Resource not found404Resource not found
5500Internal error500Internal error
3status ← OK⋯53// Use enum as interface type54Describable status→ OK = HttpStatus.OK;5556System.out.println("Description: " + status.getDescription());57System.out.println("Details: " + status.getDetails());⋯
4@Override
    public String getDescription()pass 1 of 7⋯26// Implement interface methods27@Override28public String getDescription() {29    return code200 + " " + name();30}⋯All 7 passes — pass 1 is the card abovepasscode
1200
2400
3400
4404
5500
6200
7201
5System.out.println("Description: " + status.getDescription());⋯56System.out.println("Description: " + status.getDescription());57System.out.println("Details: " + status.getDetails());⋯outputDescription: 200 OK
6@Override
    public String getDetails()pass 1 of 7⋯32@Override33public String getDetails() {34    return messageSuccess;35}⋯All 7 passes — pass 1 is the card abovepassmessage
1Success
2Success
3Resource not found
4Internal error
5Resource created
6Invalid request
7Success
7HttpStatus[] responses =⋯56System.out.println("Description: " + status.getDescription());57System.out.println("Details: " + status.getDetails());585960// Check status types61HttpStatus[] responses = {62    HttpStatus.OK,63    HttpStatus.NOT_FOUND,64    HttpStatus.SERVER_ERROR,65    HttpStatus.CREATED66};6768System.out.println("\nAnalyzing responses:");69for (HttpStatus resp : responses) {⋯outputDetails: Success

Analyzing responses:
8for (HttpStatus resp : responses)pass 1 of 4⋯68System.out.println("\nAnalyzing responses:");69for (HttpStatus respOK : responses) {70    String type = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",⋯All 4 passes — pass 1 is the card abovepassresp
1OK
2NOT_FOUND
3SERVER_ERROR
4CREATED
9public boolean isSuccess()pass 1 of 9⋯42public boolean isSuccess() {43    return code200 >= 200 && code < 300;44}⋯All 9 passes — pass 1 is the card abovepasscode
1200
2404
3500
4201
5200
6201
7400
8404
9500
10type ← SUCCESS⋯69for (HttpStatus resp : responses) {70    String type→ SUCCESS = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeSUCCESS);77}⋯
11public int getCode()pass 1 of 5⋯37// Enum-specific methods38public int getCode() {39    return code200;40}⋯All 5 passes — pass 1 is the card abovepasscodesearchCodesfound
1200———
2404———
3500———
4201———
5200200OKOK
12type);⋯71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeSUCCESS);77}⋯
13public boolean isError()pass 1 of 7⋯46public boolean isError() {47    return code404 >= 400;48}⋯All 7 passes — pass 1 is the card abovepasscode
1404
2500
3200
4201
5400
6404
7500
14type ← ERROR⋯69for (HttpStatus resp : responses) {70    String type→ ERROR = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeERROR);77}⋯
15type);⋯71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeERROR);77}⋯
16type ← ERROR⋯69for (HttpStatus resp : responses) {70    String type→ ERROR = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeERROR);77}⋯
17type);⋯71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeERROR);77}⋯
18type ← SUCCESS⋯69for (HttpStatus resp : responses) {70    String type→ SUCCESS = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeSUCCESS);77}⋯
19type);⋯71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeSUCCESS);77}⋯
20System.out.println(" Polymorphic usage:");⋯79// Polymorphic processing80System.out.println("\nPolymorphic usage:");81printDescribable(HttpStatus.BAD_REQUEST);⋯output
Polymorphic usage:
21static void printDescribable(Describable d)⋯115static void printDescribable(Describable dBAD_REQUEST) {116    System.out.println("  " + d.getDescription());117    System.out.println("  " + d.getDetails());⋯
22System.out.println("  " + d.getDescription());⋯115static void printDescribable(Describable d) {116    System.out.println("  " + d.getDescription());117    System.out.println("  " + d.getDetails());118}⋯output  400 BAD_REQUEST
23System.out.println("  " + d.getDetails());⋯80    System.out.println("\nPolymorphic usage:");81    printDescribable(HttpStatus.BAD_REQUEST);82    83    // Filter by criteria84    System.out.println("\nError statuses:");85    for (HttpStatus s : HttpStatus.values()) {86        if (s.isError()) {87            System.out.println("  " + s.getDescription());88        }89    }90    91    System.out.println("\nSuccess statuses:");92    for (HttpStatus s : HttpStatus.values()) {93        if (s.isSuccess()) {94            System.out.println("  " + s.getDescription());95        }96    }97    98    // Find by code99    int searchCode = 200;100    HttpStatus found = null;101    102    for (HttpStatus s : HttpStatus.values()) {103        if (s.getCode() == searchCode) {104            found = s;105            break;106        }107    }108    109    if (found != null) {110        System.out.println("\nCode " + searchCode + ": " + found.getDetails());111    }112    113}114115static void printDescribable(Describable d) {116    System.out.println("  " + d.getDescription());117    System.out.println("  " + d.getDetails());118}⋯output  Invalid request

Error statuses:
24for (HttpStatus s : HttpStatus.values())pass 1 of 5⋯84System.out.println("\nError statuses:");85for (HttpStatus sOK : HttpStatus.values()) {86    if (s.isError()) {⋯All 5 passes — pass 1 is the card abovepasss
1OK
2CREATED
3BAD_REQUEST
4NOT_FOUND
5SERVER_ERROR
25System.out.println("  " + s.getDescription());⋯86if (s.isError()) {87    System.out.println("  " + s.getDescription());88}⋯output  400 BAD_REQUEST
26System.out.println("  " + s.getDescription());⋯86if (s.isError()) {87    System.out.println("  " + s.getDescription());88}⋯output  404 NOT_FOUND
27System.out.println("  " + s.getDescription());⋯86if (s.isError()) {87    System.out.println("  " + s.getDescription());88}⋯output  500 SERVER_ERROR
28System.out.println(" Success statuses:");⋯91System.out.println("\nSuccess statuses:");92for (HttpStatus s : HttpStatus.values()) {⋯output
Success statuses:
29for (HttpStatus s : HttpStatus.values())pass 1 of 5⋯91System.out.println("\nSuccess statuses:");92for (HttpStatus sOK : HttpStatus.values()) {93    if (s.isSuccess()) {⋯All 5 passes — pass 1 is the card abovepasss
1OK
2CREATED
3BAD_REQUEST
4NOT_FOUND
5SERVER_ERROR
30System.out.println("  " + s.getDescription());⋯93if (s.isSuccess()) {94    System.out.println("  " + s.getDescription());95}⋯output  200 OK
31System.out.println("  " + s.getDescription());⋯93if (s.isSuccess()) {94    System.out.println("  " + s.getDescription());95}⋯output  201 CREATED
32searchCode ← 200, found ← null⋯98// Find by code99int searchCode→ 200 = 200;100HttpStatus found→ null = null;⋯
33for (HttpStatus s : HttpStatus.values())⋯102for (HttpStatus sOK : HttpStatus.values()) {103    if (s.getCode() == searchCode) {⋯
34found ← OK⋯102for (HttpStatus s : HttpStatus.values()) {103    if (s.getCode() == searchCode200) {104        found→ OK = sOK;105        break;106    }⋯
35if (found != null)⋯109if (foundOK != null) {110    System.out.println("\nCode " + searchCode200 + ": " + found.getDetails());111}⋯
36System.out.println(" Code " + searchCode + ": " + found.getDetails());⋯109if (found != null) {110    System.out.println("\nCode " + searchCode200 + ": " + found.getDetails());111}⋯output
Code 200: Success
1public static void main(String[] args)⋯51public class ImplementingInterface {52    public static void main(String[] args) {53        // Use enum as interface type54        Describable status = HttpStatus.OK;⋯
2this.code ← 200, this.message ← Successpass 1 of 5⋯21HttpStatus(int code200, String messageSuccess) {22    this.code→ 200 = code200;23    this.message→ Success = messageSuccess;24}⋯All 5 passes — pass 1 is the card abovepasscodemessagethis.codethis.message
1200Success200Success
2201Resource created201Resource created
3400Invalid request400Invalid request
4404Resource not found404Resource not found
5500Internal error500Internal error
3status ← OK⋯53// Use enum as interface type54Describable status→ OK = HttpStatus.OK;5556System.out.println("Description: " + status.getDescription());57System.out.println("Details: " + status.getDetails());⋯
4@Override
    public String getDescription()pass 1 of 7⋯26// Implement interface methods27@Override28public String getDescription() {29    return code200 + " " + name();30}⋯All 7 passes — pass 1 is the card abovepasscode
1200
2400
3400
4404
5500
6200
7201
5System.out.println("Description: " + status.getDescription());⋯56System.out.println("Description: " + status.getDescription());57System.out.println("Details: " + status.getDetails());⋯outputDescription: 200 OK
6@Override
    public String getDetails()pass 1 of 7⋯32@Override33public String getDetails() {34    return messageSuccess;35}⋯All 7 passes — pass 1 is the card abovepassmessage
1Success
2Success
3Resource not found
4Internal error
5Resource created
6Invalid request
7Internal error
7HttpStatus[] responses =⋯56System.out.println("Description: " + status.getDescription());57System.out.println("Details: " + status.getDetails());585960// Check status types61HttpStatus[] responses = {62    HttpStatus.OK,63    HttpStatus.NOT_FOUND,64    HttpStatus.SERVER_ERROR,65    HttpStatus.CREATED66};6768System.out.println("\nAnalyzing responses:");69for (HttpStatus resp : responses) {⋯outputDetails: Success

Analyzing responses:
8for (HttpStatus resp : responses)pass 1 of 4⋯68System.out.println("\nAnalyzing responses:");69for (HttpStatus respOK : responses) {70    String type = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",⋯All 4 passes — pass 1 is the card abovepassresp
1OK
2NOT_FOUND
3SERVER_ERROR
4CREATED
9public boolean isSuccess()pass 1 of 9⋯42public boolean isSuccess() {43    return code200 >= 200 && code < 300;44}⋯All 9 passes — pass 1 is the card abovepasscode
1200
2404
3500
4201
5200
6201
7400
8404
9500
10type ← SUCCESS⋯69for (HttpStatus resp : responses) {70    String type→ SUCCESS = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeSUCCESS);77}⋯
11public int getCode()pass 1 of 9⋯37// Enum-specific methods38public int getCode() {39    return code200;40}⋯All 9 passes — pass 1 is the card abovepasscodesearchCodesfound
1200———
2404———
3500———
4201———
5200———
6201———
7400———
8404———
9500500SERVER_ERRORSERVER_ERROR
12type);⋯71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeSUCCESS);77}⋯
13public boolean isError()pass 1 of 7⋯46public boolean isError() {47    return code404 >= 400;48}⋯All 7 passes — pass 1 is the card abovepasscode
1404
2500
3200
4201
5400
6404
7500
14type ← ERROR⋯69for (HttpStatus resp : responses) {70    String type→ ERROR = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeERROR);77}⋯
15type);⋯71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeERROR);77}⋯
16type ← ERROR⋯69for (HttpStatus resp : responses) {70    String type→ ERROR = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeERROR);77}⋯
17type);⋯71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeERROR);77}⋯
18type ← SUCCESS⋯69for (HttpStatus resp : responses) {70    String type→ SUCCESS = resp.isSuccess() ? "SUCCESS" :71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeSUCCESS);77}⋯
19type);⋯71                 resp.isError() ? "ERROR" : "INFO";72    System.out.printf("%d %s: %s [%s]%n",73        resp.getCode(),74        resp.name(),75        resp.getDetails(),76        typeSUCCESS);77}⋯
20System.out.println(" Polymorphic usage:");⋯79// Polymorphic processing80System.out.println("\nPolymorphic usage:");81printDescribable(HttpStatus.BAD_REQUEST);⋯output
Polymorphic usage:
21static void printDescribable(Describable d)⋯115static void printDescribable(Describable dBAD_REQUEST) {116    System.out.println("  " + d.getDescription());117    System.out.println("  " + d.getDetails());⋯
22System.out.println("  " + d.getDescription());⋯115static void printDescribable(Describable d) {116    System.out.println("  " + d.getDescription());117    System.out.println("  " + d.getDetails());118}⋯output  400 BAD_REQUEST
23System.out.println("  " + d.getDetails());⋯80    System.out.println("\nPolymorphic usage:");81    printDescribable(HttpStatus.BAD_REQUEST);82    83    // Filter by criteria84    System.out.println("\nError statuses:");85    for (HttpStatus s : HttpStatus.values()) {86        if (s.isError()) {87            System.out.println("  " + s.getDescription());88        }89    }90    91    System.out.println("\nSuccess statuses:");92    for (HttpStatus s : HttpStatus.values()) {93        if (s.isSuccess()) {94            System.out.println("  " + s.getDescription());95        }96    }97    98    // Find by code99    int searchCode = 500;100    HttpStatus found = null;101    102    for (HttpStatus s : HttpStatus.values()) {103        if (s.getCode() == searchCode) {104            found = s;105            break;106        }107    }108    109    if (found != null) {110        System.out.println("\nCode " + searchCode + ": " + found.getDetails());111    }112    113}114115static void printDescribable(Describable d) {116    System.out.println("  " + d.getDescription());117    System.out.println("  " + d.getDetails());118}⋯output  Invalid request

Error statuses:
24for (HttpStatus s : HttpStatus.values())pass 1 of 5⋯84System.out.println("\nError statuses:");85for (HttpStatus sOK : HttpStatus.values()) {86    if (s.isError()) {⋯All 5 passes — pass 1 is the card abovepasss
1OK
2CREATED
3BAD_REQUEST
4NOT_FOUND
5SERVER_ERROR
25System.out.println("  " + s.getDescription());⋯86if (s.isError()) {87    System.out.println("  " + s.getDescription());88}⋯output  400 BAD_REQUEST
26System.out.println("  " + s.getDescription());⋯86if (s.isError()) {87    System.out.println("  " + s.getDescription());88}⋯output  404 NOT_FOUND
27System.out.println("  " + s.getDescription());⋯86if (s.isError()) {87    System.out.println("  " + s.getDescription());88}⋯output  500 SERVER_ERROR
28System.out.println(" Success statuses:");⋯91System.out.println("\nSuccess statuses:");92for (HttpStatus s : HttpStatus.values()) {⋯output
Success statuses:
29for (HttpStatus s : HttpStatus.values())pass 1 of 5⋯91System.out.println("\nSuccess statuses:");92for (HttpStatus sOK : HttpStatus.values()) {93    if (s.isSuccess()) {⋯All 5 passes — pass 1 is the card abovepasss
1OK
2CREATED
3BAD_REQUEST
4NOT_FOUND
5SERVER_ERROR
30System.out.println("  " + s.getDescription());⋯93if (s.isSuccess()) {94    System.out.println("  " + s.getDescription());95}⋯output  200 OK
31System.out.println("  " + s.getDescription());⋯93if (s.isSuccess()) {94    System.out.println("  " + s.getDescription());95}⋯output  201 CREATED
32searchCode ← 500, found ← null⋯98// Find by code99int searchCode→ 500 = 500;100HttpStatus found→ null = null;⋯
33for (HttpStatus s : HttpStatus.values())pass 1 of 5⋯102for (HttpStatus sOK : HttpStatus.values()) {103    if (s.getCode() == searchCode) {⋯All 5 passes — pass 1 is the card abovepassssearchCodefound
1OK——
2CREATED——
3BAD_REQUEST——
4NOT_FOUND——
5SERVER_ERROR500SERVER_ERROR
34found ← SERVER_ERROR⋯102for (HttpStatus s : HttpStatus.values()) {103    if (s.getCode() == searchCode500) {104        found→ SERVER_ERROR = sSERVER_ERROR;105        break;106    }⋯
35if (found != null)⋯109if (foundSERVER_ERROR != null) {110    System.out.println("\nCode " + searchCode500 + ": " + found.getDetails());111}⋯
36System.out.println(" Code " + searchCode + ": " + found.getDetails());⋯109if (found != null) {110    System.out.println("\nCode " + searchCode500 + ": " + found.getDetails());111}⋯output
Code 500: Internal error

enum Name implements Interface - enum provides interface methods.

Exercise: Practical.java

Build an operation enum (ADD, SUBTRACT, MULTIPLY, DIVIDE)

pass	`weightPounds`	`method`	`baseCost`
1	60.0	—	—
2	60.0	—	—
3	60.0	OVERNIGHT	—
4	60.0	—	—
5	5.0	—	—
6	5.0	—	—
7	5.0	—	24.99
8	5.0	—	—

pass	`x`	`y`
1	10.0	3.0
2	100.0	50.0
3	100.0	50.0
4	100.0	50.0
5	100.0	50.0
6	100.0	50.0
7	100.0	50.0
8	100.0	50.0

pass	`op`	`this.left`	`this.op`	`this.right`
1	PLUS	100.0	PLUS	50.0
2	MINUS	100.0	MINUS	50.0
3	MULTIPLY	100.0	MULTIPLY	50.0
4	DIVIDE	100.0	DIVIDE	50.0

pass	`expr`
1	100 + 50 = 150.00
2	100 - 50 = 50.00
3	100 * 50 = 5000.00
4	100 / 50 = 2.00

pass	`code`	`message`	`this.code`	`this.message`
1	200	Success	200	Success
2	201	Resource created	201	Resource created
3	400	Invalid request	400	Invalid request
4	404	Resource not found	404	Resource not found
5	500	Internal error	500	Internal error

pass	`code`	`searchCode`	`s`	`found`
1	200	—	—	—
2	404	—	—	—
3	500	—	—	—
4	201	—	—	—
5	200	—	—	—
6	201	—	—	—
7	400	—	—	—
8	404	404	NOT_FOUND	NOT_FOUND

pass	`s`	`searchCode`	`found`
1	OK	—	—
2	CREATED	—	—
3	BAD_REQUEST	—	—
4	NOT_FOUND	404	NOT_FOUND

pass	`code`	`searchCode`	`s`	`found`
1	200	—	—	—
2	404	—	—	—
3	500	—	—	—
4	201	—	—	—
5	200	200	OK	OK

pass	`code`	`searchCode`	`s`	`found`
1	200	—	—	—
2	404	—	—	—
3	500	—	—	—
4	201	—	—	—
5	200	—	—	—
6	201	—	—	—
7	400	—	—	—
8	404	—	—	—
9	500	500	SERVER_ERROR	SERVER_ERROR

pass	`code`	`searchCode`	`s`	`found`
1	200	—	—	—
2	404	—	—	—
3	500	—	—	—
4	201	—	—	—
5	200	200	OK	OK

pass	`code`	`searchCode`	`s`	`found`
1	200	—	—	—
2	404	—	—	—
3	500	—	—	—
4	201	—	—	—
5	200	200	OK	OK