JAVA源码之21点游戏源码

import java.awt.Color; 
import java.awt.Font; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JOptionPane; 
import javax.swing.SwingConstants; 
import javax.swing.border.LineBorder; 

public class game21 extends JFrame { 
private JLabel label_2; 
private int number; 
private int sum; 
final JLabel label = new JLabel(); 
final JLabel label_1 = new JLabel(); 

public static void main(String[] args) { 
new game21(); 
} 

public game21() { 
super("21点？！"); 
getContentPane().setLayout(null); 
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
final JButton button = new JButton(); 
button.addActionListener(new ActionListener() { 
public void actionPerformed(final ActionEvent arg0) {