Create a banner using Applet in java pgm

Create a banner using Applet

import java.awt.*;

import java.applet.*;

public class SampleBanner extends Applet

implements Runnable

{

   String str = "This is a simple Banner ";

   Thread t ;

   boolean b;

   public void init()

  {

      setBackground(Color.gray);

      setForeground(Color.yellow);

   }

   public void start()

   {

      t = new Thread(this);

      b = false;

      t.start();

   }

   public void run ()

  {

      char ch;

      for( ; ; )

{

      try

      {

         repaint();

         Thread.sleep(250);

         ch = str.charAt(0);

         str = str.substring(1, str.length());

         str = str + ch;

      }

      catch(InterruptedException e){}

      }

   }

   public void paint(Graphics g)

  {

      g.drawRect(1,1,300,150);

      g.setColor(Color.yellow);

      g.fillRect(1,1,300,150);

      g.setColor(Color.red);

      g.drawString(str, 1, 150);

   }

}