import java.awt.event.*; 
import java.awt.*; 
import java.applet.Applet; 

public class ralli extends Applet implements KeyListener, Runnable{ 
  int x=100, y=100;     
  int samm=0; 
  int suund=0;
  int i=0;
  boolean veel=true;
  boolean algus=true;
      
  public ralli(){ 
    init(); 
  }
  public void init(){ 
    addKeyListener(this); 
    requestFocus(); 
  }
  
  public void paint(Graphics g){
   if(algus){
	 new Thread(this).start();  
	 algus=false;
	}
  }  
  
  public void joonista(){
   Graphics g=this.getGraphics();
    for(i=0;;i++){ 
      for(x=0; x<984; x=x+samm){
        g.setColor(Color.blue);       //joonistatakse sinine ring 
        g.fillOval(x, 70+suund, 40, 40); 
        try{Thread.sleep(50);}catch(Exception e){} //oodatakse veidi 
        g.setColor(Color.white);       //ning kustutatakse see 
        g.fillOval(x, 70+suund, 40, 40);     //valgega üle joonistades 
      } 
      for(x=984; x>0; x=x-samm){ 
        g.setColor(Color.blue);       //joonistatakse sinine ring 
        g.fillOval(x, 70+suund, 40, 40); 
        try{Thread.sleep(50);}catch(Exception e){} //oodatakse veidi 
        g.setColor(Color.white);       //ning kustutatakse see 
        g.fillOval(x, 70+suund, 40, 40);     //valgega üle joonistades 
      }     
    }
  }

  public boolean isFocusTraversable(){ 
    return true; 
  }
  public void keyPressed(KeyEvent e){ 
    int kood=e.getKeyCode(); 
    if(kood==KeyEvent.VK_LEFT)samm--; 
    if(kood==KeyEvent.VK_RIGHT)samm++; 
    if(kood==KeyEvent.VK_UP)samm--; 
    if(kood==KeyEvent.VK_DOWN)samm++; 
    repaint(); 
  }
  public void keyReleased(KeyEvent e){} 
  public void keyTyped(KeyEvent e){} 

  public void run(){
    while(veel){
      joonista();
      try{Thread.sleep(2000);
      } catch(Exception e){}
    }
  }

public static void main(String argumendid[]){ 
    Frame f=new Frame(); 
    f.add(new ralli()); 
    f.setSize(1024, 500); 
    f.setVisible(true); 
    }
}