这个怎么运行不出来结果？

来源：互联网发布：vue.js vm是什么意思编辑：程序博客网时间：2024/05/02 04:20

//左手画圆，右手画方！

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Examplelf extends Applet implements Runnable
{
Thread left,right;
Graphics mypen;
int x,y;
public void init ()
{
  left=new Thread (this);
  right=new Thread (this);
  x=10;y=10;
  mypen=getGraphics ();
}
public void start ()
{
  left.start ();
  right.start ();

}
public void run ()
{
  while (true)
  {
   if(Thread.currentThread ()==left)
   {
    x=x+1;
    if (x>20) x=10;
    mypen.setColor (Color.blue);
    mypen.clearRect (10,10,300,40);
    mypen.drawRect (10+x,10,40,40);
    try{
     left.sleep (60);
    }
    catch (InterruptedException e) {}

    }
    else if (Thread.currentThread ()==right)
    {
     y=y+1;
     if (y>240) y=10;
     mypen.setColor (Color.red);
    mypen.clearRect (10,90,300,40);
    mypen.drawOval (10+y,90,40,40);
    try{
     right.sleep (60);
     }
        catch (InterruptedException e) {}
      }
      }
    }
}