이 짤방에서 버튼 클릭하면 빈공간으로 이동하는 이거

아 존나 어려워... ㅋㅋㅋ

완변하게 만들라면 도대체 어떻게 해야하는거야.. ㅠㅠ

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class Test {

public static void main(String[] args) {

new MyFrame();

 }

}

class MyFrame extends JFrame {

MyFrame() {

setSize(400,300);

setTitle("My Frame");

setLocationRelativeTo(null);

add(new MyPanel(), BorderLayout.CENTER);

setVisible(true);

 }

}

class MyPanel extends JPanel {

MyPanel() {

setLayout(new GridLayout(4,4));

JButton[] b = new JButton[16];

MyListener listener = new MyListener(b);

for (int i=0; i<16; i++) {

b[i] = new JButton(String.valueOf(i));

b[i].addActionListener(listener);

add(b[i]);

}

b[15].setEnabled(false);

b[15].setText("");

 }

}

class MyListener implements ActionListener {

private JButton[] btn;

private int[] nb;

MyListener(JButton[] b) {

btn = b;

nb = new int[4];

}

public void actionPerformed(ActionEvent e) {

JButton b = (JButton)e.getSource();

for (int i=0; i<16; i++)

if (b == btn[i]) {

System.out.println(i);

findNeighbor(i);

System.out.println("up = " + nb[0]);

System.out.println("down = " + nb[1]);

System.out.println("left = " + nb[2]);

System.out.println("right = " + nb[3]);

}

}

private void findNeighbor(int id) {

// up

nb[0] = id-4;

// down

nb[1] = id+4;

if (nb[1] >= 16)

nb[1] = -1;

// left

nb[2] = id-1;

if (nb[2] < 0 || nb[2]%4 == 3)

nb[2] = -1;

// right

nb[3] = id+1;

if (nb[3]%4 == 0)

nb[3] = -1;

}

}