import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
public class Koduliik extends Applet implements Runnable, KeyListener{
int y=150;
int x=20;
int m=1;
int k=0;
boolean veel=true;

public Koduliik(){
 addKeyListener(this);
 requestFocus();
 new Thread(this).start();
}

public void joonista(){
 Graphics g=this.getGraphics();
  if(g!=null){
  if(x>270){
    m=-m;
    k=-k;
  }
  if(x<0){
    m=-m;
    k=-k;
  }
  x=x+m+k;
  g.setColor(Color.black);
  g.drawOval(x, y, 10, 10);
  try{Thread.sleep(50);}catch(Exception e){}
  g.setColor(Color.white);
  g.drawOval(x, y, 10, 10);
  }
}

public void run(){
 while(veel){
  joonista();
 }
}

public void keyPressed(KeyEvent e){
int kood=e.getKeyCode();
if(kood==KeyEvent.VK_LEFT)m--;
if(kood==KeyEvent.VK_RIGHT)m++;
}
public void keyReleased(KeyEvent e){}
public void keyTyped(KeyEvent e){}

public static void main(String[] argumendid){
    Frame f=new Frame();
    f.add(new Koduliik());
    f.setSize(300, 300);
    f.setVisible(true);
  }
}