Java Applet ile yapılmış gelen giden top

package applet;

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;

public class gidengelentop extends Applet implements Runnable{
int x;

int adim;
public void init(){
    
   adim=10;
          x=0; 
    setSize(800,800);
   
    setBackground(Color.CYAN);
    Thread t=new Thread(this);
    t.start();
    
}
public void paint(Graphics a){
    
    
    a.setColor(Color.RED);
    a.drawOval(x, 400-100,50,50);

    
    

      
    
   }
    
    
   


    @Override
    public void run() {
            try{
            while(true){
        Thread.sleep(10);
        
        
            
         
     x=x+adim;
             
       if(x<800 && x>=0){
            
         
        repaint();
        }
            
        else
                {
            
         adim=-adim;            
            repaint();
           
            }
        }   }catch(Exception g){
            
}
    }


 

    
}

Ekran Görüntüsü;