Write a watch java program

import javax.swing.*;  

import java.awt.*;  

import java.text.*;  

import java.util.*;  

public class DigitalWatch implements Runnable{  

JFrame f;  

Thread t=null;  

int hours=0, minutes=0, seconds=0;  

String timeString = "";  

JButton b;  

DigitalWatch(){  

   f=new JFrame();  

   t = new Thread(this);  

       t.start();  

   b=new JButton();  

       b.setBounds(100,100,100,50);  

   f.add(b);  

   f.setSize(300,400);  

   f.setLayout(null);  

   f.setVisible(true);  

}  

public void run() {  

     try {  

        while (true) {  

           Calendar cal = Calendar.getInstance();  

           hours = cal.get( Calendar.HOUR_OF_DAY );  

           if ( hours > 12 ) hours -= 12;  

           minutes = cal.get( Calendar.MINUTE );  

           seconds = cal.get( Calendar.SECOND );  

           SimpleDateFormat formatter = new SimpleDateFormat("hh:mm:ss");  

           Date date = cal.getTime();  

           timeString = formatter.format( date );  

           printTime();  

           t.sleep( 1000 );  // interval given in milliseconds  

        }  

     }  

     catch (Exception e) { }  

}  

public void printTime(){  

b.setText(timeString);  

}  

public static void main(String[] args) {  

   new DigitalWatch();  

}  

}  

Explanation:

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