监听器扩展

package cn.lyc.listener;

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

public class Test {
    public static void main(String[] args){
        Frame frame = new Frame("HELLO WORLD");//建立一个窗体
        Panel panel = new Panel(null);//面板
        frame.setLayout(null);//设置窗体的布局

        frame.setBounds(300,300,500,500);//设置坐标
        frame.setBackground(Color.red);//设置颜色

        panel.setBounds(50,50,300,300);
        panel.setBackground(Color.yellow);

        frame.add(panel);

        frame.setVisible(true);//可见


        //监听事件，关闭事件
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}