Count down timer

I am writing an application to put a basketball scoreboard on a big screen TV.  I am having a little trouble with the clock.  I have written a count down timer that works fine but I can't stop the count if a team takes a time out.  Can someone help me with the code that will allow me to start and stop the clock.  I have a socket for communicating between two computers, one is attached to the big TV and the other is the machine use to control the scoreboard machine.  I connect through a socket and send commands to the scoreboard machine like "startClock" to start it and I would like to sent "stopClock" to stop it and then "startClock" once again to resume.  I have the communications working fine and when I send "startClock" to the scoreboard machine the clock starts as it should.  Any ideas how to toggle it on and off.  The timer code is below and I start it with:

            CountDownTimer c = new CountDownTimer(0, 8, 0);

It starts counting down from 8 minutes;


  Thanks.

       
    public class CountDownTimer implements ActionListener {
    private long count;
    private DateFormat df;
    private javax.swing.Timer t;

    public CountDownTimer(int hours, int minutes, int seconds) {
      // suppose to show as in 01 HR 30 MIN 30 SEC.
       count = 0;
       t = new javax.swing.Timer(1000, this);

      Calendar cal = Calendar.getInstance();
      cal.set(Calendar.HOUR_OF_DAY, hours);
      cal.set(Calendar.MINUTE, minutes);
      cal.set(Calendar.SECOND, seconds);
       count = cal.getTime().getTime();
      df = new SimpleDateFormat("mm:ss");
      t.start();

    }
    public void actionPerformed(ActionEvent e) {
      // suppose to countdown till OO HR 00 MIN 00 SEC
      tfTime.setText(df.format(count));

      if(df.format(count).equals("00:00:00"))
          t.stop();
      count -= 1000;
    }
}