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

public class BufferTest3 {
    public BufferTest3(){
        ByteBuffer buffer = ByteBuffer.allocate(15);
        
        ByteBufferUtility.initByteBuffer(buffer);
        ByteBufferUtility.printByteBuffer(buffer);

        System.out.println("\nBuffer get()");

        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();

        byte b = buffer.get();
        System.out.println("Return value = 0x" + Integer.toHexString((int)b & 0xff));
        ByteBufferUtility.printByteBuffer(buffer);

        System.out.println("\nBuffer get()");

        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();

        b = buffer.get();
        System.out.println("Return value = 0x" + Integer.toHexString((int)b & 0xff));
        ByteBufferUtility.printByteBuffer(buffer);

        System.out.println("\nBuffer get(byte[] dst)");

        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();

        byte[] dst = new byte[5];
        buffer.get(dst);
        System.out.println("dst is " + bytesToString(dst));
        ByteBufferUtility.printByteBuffer(buffer);

        System.out.println("\nBuffer get(byte[] dst, int offset, int length)");

        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();

        dst = new byte[5];
        buffer.get(dst, 1, 3);
        System.out.println("dst is " + bytesToString(dst) + ", offset = 1, length = 3");
        ByteBufferUtility.printByteBuffer(buffer);

        System.out.println("\nBuffer get(int index)");

        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();

        b = buffer.get(2);
        System.out.println("index = 2, return value = 0x" + Integer.toHexString((int)b & 0xff));
        ByteBufferUtility.printByteBuffer(buffer);

        System.out.println("\nBuffer get() position = limit の場合");
        buffer.limit(10);
        buffer.position(buffer.limit());
        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();

        try{
            b = buffer.get();
            System.out.println("Return value = 0x" + Integer.toHexString((int)b & 0xff));
        }catch(BufferUnderflowException ex){
            ex.printStackTrace();
        }
        ByteBufferUtility.printByteBuffer(buffer);

        System.out.println("\nBuffer get(byte[] dst) dst のサイズが残りのバイト数より大きかったら");
        buffer.limit(buffer.capacity());
        ByteBufferUtility.printByteBuffer(buffer);
        System.out.println();

        dst = new byte[20];
        try{
            buffer.get(dst);
            System.out.println("Values are " + bytesToString(dst));
        }catch(BufferUnderflowException ex){
            ex.printStackTrace();
        }
        ByteBufferUtility.printByteBuffer(buffer);
    }

    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 BufferTest3();
    }
}