多线程绘图报错 怎么解决

Question

package A;

import java.awt.Graphics;

import javax.swing.*;

public class xiancheng extends JFrame{
myPn my=null;

public static void main(String[] args) {
    // TODO Auto-generated method stub
    xiancheng xin=new xiancheng();
}
public xiancheng() 
{
    my=new myPn();


    this.setSize(500, 500);
    this.setVisible(true);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.add(my);
    this.setLocationRelativeTo(null);
    Thread t=new Thread(my);
    while(true)
    {
        try {
            Thread.sleep(10);
            t.start();

        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        上面是代码   本人新人  就想画个会动的小球 报错了  错误如下
        Exception in thread "main" 11//11

java.lang.IllegalThreadStateException
at java.lang.Thread.start(Unknown Source)
at A.xiancheng.(xiancheng.java:29)
at A.xiancheng.main(xiancheng.java:12)

    }




}

}
class myPn extends JPanel implements Runnable
{
int x=10;

int y=10;

public void paint (Graphics g)
{
    super.paint(g);
    g.fillOval(x, y, 10, 10);
}
@Override
public void run() {
    // TODO Auto-generated method stub
    while (true)
    {
        try {
            Thread.sleep(10);
            this.repaint();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    x++;
    y++;
    System.out.println(x+"//"+y);

    }

}

}

Answer 1

http://blog.csdn.net/supersonico/article/details/39014163