事件处理程序

 1 package WindowBuilder;
 2 import java.awt.*;
 3 import java.awt.event.*;
 4 import javax.swing.*;
 5 public class EventHandling extends JFrame
 6 {
 7     public EventHandling()
 8     {
 9         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
10         addWindowListener //设置窗口大小为屏幕的0.8倍
11         (
12             new WindowAdapter() //窗口适配器，可以只重写自己所需的方法
13             {
14                 public void windowOpened(WindowEvent e)
15                 {
16                     Toolkit toolkit=getToolkit();
17                     Dimension screenSize=toolkit.getScreenSize();
18                     int width=(int)(screenSize.width*0.8);
19                     int height=(int)(screenSize.height*0.8);
20                     setSize(width,height);    
21                 }
22             }
23         );
24         setLocation(100,100);    
25         setVisible(true);
26         JPanel panel=new JPanel();
27         setContentPane(panel);
28         panel.setLayout(null);
29     }
30     public static void main(String[] args) 
31     {
32          new EventHandling();
33     }
34 }