import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class Pall3 extends Applet implements ActionListener{
  TextField tf1=new TextField(10);
  public Pall3(){
    add(tf1);
    tf1.addActionListener(this);
  }
  public void actionPerformed(ActionEvent e){
    double x=100, y=100, kv=0;
    Graphics g=getGraphics();
    while(x<getWidth() && x>=0 && y<getHeight()){
       g.setColor(getForeground());
       g.drawOval((int)x, (int)y, 10, 10);
       try{Thread.sleep(100);}catch(Exception viga){}
       g.setColor(getBackground());
       g.drawOval((int)x, (int)y, 10, 10);
       kv=kv+1;
       y=y+kv;
    }
  }
  public static void main(String arg[]){
    Frame f=new Frame("Palli lend");
    f.add(new Pall3());
    f.setSize(200, 200);
    f.setVisible(true);
  }
}