窗口监听

package com.hua.demo3;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class TestWindow {
    public static void main(String[] args) {
        new WindowFrame();
    }
}
class WindowFrame extends Frame{
    public WindowFrame() {
        setBounds(100,100,200,200);
        setVisible(true);

        this.addWindowListener(new WindowAdapter() {
            //匿名内部类
            //关闭窗口
            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("windowClosing");
                System.exit(0);
            }
            //激活窗口
            @Override
            public void windowActivated(WindowEvent e) {
                WindowFrame frame = (WindowFrame) e.getSource();
                frame.setTitle("被激活了");
                System.out.println("windowActivated");
            }
        });
    }
}