本节内容视频链接：10、画笔paint_哔哩哔哩_bilibilihttps://www.bilibili.com/video/BV1DJ411B75F?p=10&vd_source=b5775c3a4ea16a5306db9c7c1c1486b5

package com.yundait.lesson03;

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

public class TestPaint {
    public static void main(String[] args) {
        myPaint myPaint = new myPaint();
        myPaint.loadFrame();
        myPaint.closeWindows();
    }
}
class myPaint extends Frame {

    //加载窗口
    public void loadFrame(){
        setBounds(300,300,600,500);
        setVisible(true);
    }
    //窗口画笔工具
    @Override
    public void paint(Graphics g) {
        super.paint(g);
        g.setColor(Color.red);
        g.drawOval(100,100,100,100);
        g.fillOval(300,300,100,100);

        g.setColor(Color.green);
        g.fillRect(200,200, 100,200);
    }
    //监听窗口关闭
    public void closeWindows(){
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}