import javax.swing.*;
import java.awt.*;

  public class Anim0 extends JApplet  {

   int x,y,r;
   Display disegno;
   
   public void init() {
     disegno = new Display();
     setContentPane(disegno);
     
     x = 0; y=200; r=50;

    while(true) {
      for (x = r; x <= disegno.getSize().width ; x=x+1) {
        disegno.repaint();
 }
 }
 }
   class Display extends JPanel{
    public void  paintComponent(Graphics g) {
      g.setColor(Color.red);
      g.fillOval(x,y,2*r,2*r);
   }
   }
}