Simple java clock in java applet using Thread

Below code is the example of Thread in Java. This is simple Java Applet to display clock using Java Thead.

import java.awt.*;
import java.applet.*;
import java.applet.*;
import java.awt.*;
import java.util.*;

public class ClockApplet extends Applet implements Runnable
{
   Thread t,t1;
   public void start(){
      t = new Thread(this);
      t.start();
   }
    public void run(){
      t1 = Thread.currentThread();
      while(t1 == t){
         repaint();
         try{
            t1.sleep(1000);   
         }
         catch(InterruptedException e){}
      }
   }

   public void paint(Graphics g){

      Calendar cal = new GregorianCalendar();

      String hour = String.valueOf(cal.get(Calendar.HOUR));

      String minute = String.valueOf(cal.get(Calendar.MINUTE));

      String second = String.valueOf(cal.get(Calendar.SECOND));

      g.drawString(hour + ":" + minute + ":" + second, 20, 30);

   }

}