public Image[]img;
    public int index ;
    public MyCanvas() {
          try {
            img= new Image[3];
            img[0] = Image.createImage("/1.PNG") ;
            img[1] = Image.createImage("/2.PNG") ;
            img[2] = Image.createImage("/3.PNG") ;
            new Thread(this).start() ;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public void paint(Graphics g) {
       g.setColor(0);
       g.fillRect(0, 0, getWidth(), getHeight());
       g.drawImage(img[index], 0, 0, 0);
     
    }
    
    public void run() {
        while (true) {
              repaint();
              serviceRepaints();
              try {
                Thread.sleep(300);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
             index =(index == 2) ? index = 0 : ++index;
        }
    }