wineventdemo.java

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

class WinDemo extends JFrame
{
  public WinDemo()
  {
    super("窗口事件例子-阻止窗口关闭");
    this.addWindowListener(new WindowCloser());  // 注册监听器对象
    this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
    this.setSize(400,300);
    this.setVisible(true);
  }
  
  // 内部类,窗口事件的监听类
  private class WindowCloser extends WindowAdapter
  {
    public void windowClosing(WindowEvent e)
    {
      int sel = JOptionPane.showConfirmDialog(new JFrame(),"确认关闭窗口吗?");
      if(sel == JOptionPane.YES_OPTION)
      {
        e.getWindow().dispose();
        System.exit(0);
      }
    }
  }
}

class tester
{
  public static void main(String[] args)
  {
    new WinDemo();
  }
}