解决了窗口关闭问题

package com.zhoutianhao.lesson1;

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

public class TestPanel {
    public static void main(String[] args) {
        Frame frame = new Frame();
        Panel panel = new Panel();
        //设置布局
        frame.setLayout(null);

        //坐标
        frame.setBounds(300,300,400,400);
        frame.setBackground(new Color(1, 1, 1));

        //panel设置坐标，相对于frame
        panel.setBounds(50,50,300,300);
        panel.setBackground(new Color(188,204,243));

        //frame.add(panel)
        frame.add(panel);

        frame.setVisible(true);

        //监听事件，监听窗口关闭事件 System.exit(0)
        //适配器模式
        frame.addWindowListener(new WindowAdapter() {
            //窗口点击关闭时要做的事情
            @Override
            public void windowClosing(WindowEvent e) {
                //结束程序
                System.exit(0);
        }
        });
    }
}