copy inputstream to outputstream

package prep;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;

public class CopyStreamMain {

	public static void main(String[] args) throws Exception {
		InputStream input=CopyStreamMain.class.getResourceAsStream("input.data");
		FileOutputStream out=new FileOutputStream("/tmp/output.data");
		copyStream(input, out);
		out.close();
	}
	
	public static void copyStream(InputStream in, OutputStream out) throws IOException {
		byte[] chunk= new byte[1024];
		int nbyte;
		while(  (nbyte=in.read(chunk)) >-1) {
			out.write(chunk,0,nbyte);
		};
		in.close();
	}
}