2048小游戏（Java）（swing实现）（一）

自己写的2048小游戏，仅支持鼠标操作

主要是我不知道怎么添加键盘监听

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class JF2048 extends JFrame {

/**
     * 
     */
    private static final long serialVersionUID = 1L;

private Ja2048 ja;

public JButton b[] = {
new JButton(),
new JButton(),
new JButton(),
new JButton()
};

public JButton back = new JButton("back");

private ActionListener b0 = new ActionListener(){
public void actionPerformed(ActionEvent e){
ja.cp0();
}};

private ActionListener b1 = new ActionListener(){
public void actionPerformed(ActionEvent e){
ja.cp1();
}};

private ActionListener b2 = new ActionListener(){
public void actionPerformed(ActionEvent e){
ja.cp2();
}};

private ActionListener b3 = new ActionListener(){
public void actionPerformed(ActionEvent e){
ja.cp3();
}};

private ActionListener back1 = new ActionListener(){
public void actionPerformed(ActionEvent e){
ja.back();
}};

public JLabel[][] la ={
{new JLabel(),new JLabel(),new JLabel(),new JLabel()},
{new JLabel(),new JLabel(),new JLabel(),new JLabel()},
{new JLabel(),new JLabel(),new JLabel(),new JLabel()},
{new JLabel(),new JLabel(),new JLabel(),new JLabel()},
};


public JF2048(){

super("2048");

//this.addKeyListener(x);

b[0].setBounds(3,20,16,156);
b[1].setBounds(178,20,16,156);
b[2].setBounds(20,3,156,16);
b[3].setBounds(20,178,156,16);
back.setBounds(3,3,16,16);

b[0].addActionListener(b0);
b[1].addActionListener(b1);
b[2].addActionListener(b2);
b[3].addActionListener(b3);
back.addActionListener(back1); 


for(int i =0;i<4;i++)
for(int j =0;j<4;j++){
la[i][j].setBounds(20+40*i,20+40*j,36,36);
la[i][j].setOpaque(true);
//la[i][j].setFont(new Font("幼圆",1,24));
la[i][j].setHorizontalAlignment(SwingConstants.CENTER);
}

this.setSize(217,238);
this.add(b[0]);
this.add(b[1]);
this.add(b[2]);
this.add(b[3]);
this.add(back);
for(int i =0;i<4;i++)
for(int j =0;j<4;j++)
this.add(la[i][j]);
JLabel p = new JLabel();
p.setBackground(new Color(127,127,127));
p.setOpaque(true);
this.add(p);


}

public static void main(String[] args){
JF2048 jf = new JF2048();
jf.ja=new Ja2048(jf);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setVisible(true);
}

}

界面层代码