以下是我的窗口事件处理程序：

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 }

运行结果如下：