import java.nio.*;
import java.util.*;

public class BufferTest6 {
    public BufferTest6(){
        ByteBuffer buffer = ByteBuffer.allocate(15);
        
        ByteBufferUtility.initByteBuffer(buffer);
        ByteBufferUtility.printByteBuffer(buffer);

        // Compacting
        System.out.println("\nBuffer compact()");
        buffer.position(5);
        buffer.limit(12);
        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();
        ByteBufferUtility.printByteBuffer(buffer.compact());

        // Duplicating
        System.out.println("\nBuffer duplicate()");
        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();

	ByteBuffer dupBuffer = buffer.duplicate();
        ByteBufferUtility.printByteBuffer(dupBuffer);

	// コピーした Buffer を操作する
	System.out.println("\nコピーした Buffer を操作");
	dupBuffer.position(0);
	dupBuffer.put((byte)0x10);

        System.out.println("Original Buffer");
        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();

        System.out.println("Duplicated Buffer");
        ByteBufferUtility.printByteBuffer(dupBuffer);

        // Slicing
        System.out.println("\n\nBuffer slice()");
        buffer.limit(12);
        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();
        ByteBufferUtility.printByteBuffer(buffer.slice());
        
        // Wrapping
        System.out.println("\nCreate ByteBuffer using wrap()");
        byte[] array = new byte[]{(byte)0x20, (byte)0x21, (byte)0x22, (byte)0x23, (byte)0x24};
        System.out.println("array = " + bytesToString(array));
        System.out.println();
        ByteBufferUtility.printByteBuffer(ByteBuffer.wrap(array));
    }

    private String bytesToString(byte[] bytes){
        StringBuffer strBuffer = new StringBuffer("[");
        int i;
        for(i = 0 ; i < bytes.length - 1 ; i++){
            strBuffer.append(Integer.toHexString((int)bytes[i] & 0xff));
            strBuffer.append(", ");
        }
        strBuffer.append(Integer.toHexString((int)bytes[i] & 0xff));
        strBuffer.append("]");

        return strBuffer.toString();
    }

    public static void main(String[] args){
        new BufferTest6();
    }
}