Java GUI画圆。

package ydj;

import java.awt.*;

import javax.swing.*;

public class huayuan extends JFrame

{

    public huayuan()

    {

        mianban mb=new mianban();

        Container content=getContentPane();

        this.setVisible(true);

        this.setSize(400, 400);

        content.add(mb);

        mb.setBackground(Color.WHITE);

        mb.setForeground(Color.GREEN);

    }

    class mianban extends JPanel

    {

        public void paint(Graphics g)

        {

            super.paint(g);

            g.drawOval(500,100,100,100);        //第一层

            g.drawOval(300,200,100,100);        //第二层第一个

            g.drawOval(700,200,100,100);        //弟二层第二个

            g.drawOval(150,300,100,100);        //第三层第一个

            g.drawOval(400,300,100,100);        //第三层第二个

            g.drawOval(550,300,100,100);        //第三层第三个

            g.drawOval(800,300,100,100);        //第三层第四个

            g.drawOval(250,400,100,100);        //第三层第一个

            g.drawLine(510,175,390,225);

            g.drawLine(600,150,715,215);

            g.drawLine(310,275,150,300);

            //g.drawLine(300,200,400,300);

        }

    }

    public static void main(String args[])

    {

        huayuan c=new huayuan();

    }

}