在面板上“画”三毛（Java）

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TestSanmo extends JFrame {
  public TestSanmo() {
    add(new Sanmo());
  }

  public static void main(String[] args) {
    JFrame frame = new TestSanmo();
    frame.setTitle("TestSanmo");
    frame.setSize(210, 330);
    frame.setLocationRelativeTo(null); // Center the frame   
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);    
  }
}


class Sanmo extends JPanel{
   //定义多边形坐标数组
     int polygon_x[]={5,20,25,175,180,195,5}; 
     int polygon_y[]={300,270,230,230,270,300,300}; 
     int polygon_pt_num=7;

     public void paintComponent(Graphics g){
      int red,green,blue;

      //画头部,椭圆方法drawOval
      g.setColor(Color.black);     //setColor用来设置要使用的颜色           
      g.drawOval(40,40,120,150);
      //画眼睛,椭圆方法drawOval
      g.drawOval(57,75,30,20);
      g.drawOval(110,75,30,20);
      //画眼珠,填充椭圆方法fillOval
      g.fillOval(68,81,10,10);
      g.fillOval(121,81,10,10);

      //画鼻子,椭圆方法drawOval
      g.drawOval(85,100,30,30);

      //画头发,直线方法drawLine,画弧方法drawArc
      g.drawLine(100,10,100,60);
      g.drawArc(110,20,100,80,90,90);
      //drawArc(int x, int y, int width, int height, int startAngle, int arcAngle) 
      g.drawArc(10,30,80,60,0,80);

      //画嘴巴,填充画弧方法fillArc
      g.setColor(Color.red);
      g.fillArc(60,130,80,40,180,180);

      //画耳朵,填充椭圆方法fillOval,复制图形方法copyArea
      g.setColor(Color.blue);
      g.fillOval(25,92,15,30);

      g.copyArea(25,92,15,30,136,0);   //拷贝某区域的图形至另一区域
      //copyArea(int x, int y, int width, int height, int dx, int dy) 
      //Copies an area of the component by a distance specified by dx and dy.
      //136--宽度差dx; 0--高度差dy;
   
      //画脖子,填充矩形方法fillRect
      g.setColor(Color.pink);
      g.fillRect(85,190,30,40);

      //画身体,多边形方法fillPolygon
      red=30;
      blue=100;
      green=200;
      g.setColor(new Color(red,green,blue));
      g.fillPolygon(polygon_x,polygon_y,polygon_pt_num); 
    }
}