windowevent2.java

学习java编程的好程序

import java.awt.*;
import java.awt.event.*;
///创建一个窗口事件适配器类
///在这个适配器内只需要实现关闭窗口后的事件就可以了
public class windowevent2 extends Frame 
{
    public windowevent2()
    {	
        WindowListener wh=new windowhandler();
        addWindowListener(wh);
    }
    public static void main(String[] args)
    {
        windowevent1 me=new windowevent1();
        me.setSize(400,300);
        me.setVisible(true);
    }
    class windowhandler extends WindowAdapter
    {
        public void windowClosing(WindowEvent e)
        {
            Button b1=new Button("确定");
            Button b2=new Button("取消");
            Label l=new Label("你能确定关闭系统了吗？");
            Dialog d=new Dialog((Frame)e.getSource(),"系统出错了!",true);
            d.setSize(200,100);
            d.setLocation(0,0);
            Panel p=new Panel();
            p.setLayout(new GridLayout(1,2));
            d.add(p,"South");
            d.add(l,"Center");
            p.add(b1);
            p.add(b2);  
            d.setVisible(true);
            b1.setVisible(true);
            b2.setVisible(true);
            l.setVisible(true);
        }
    }
}