J2ME Countdown Timer

Question

I'm working on a J2ME game that requires the use of a countdown timer. I've put in a Timer.scheduleAtFixedRate call inside my run() method, but apparently it's taking up a lot of resources and it's proceeding too fast (a 3-minute countdown will finish in about 30 seconds or less).
I have a separate method that calculates the amount of time left in terms of minutes and seconds, and the output will jump irregularly (say from 2:59 to 1:13 to 0:57, and so on).
Here's the piece of code in question:
    public void run() {
        Thread currentThread = Thread.currentThread();
        //timeLeftInMillis is an int
        timeLeftInMillis = 180000;
        try
            // This ends when myThread is set to null, or when
            // it is subsequently set to a new thread; either way, the
            // current thread should terminate.
            while (currentThread == myThread)
                //myTimer is a Timer object instantiated in the
                //constructor
                myTimer.scheduleAtFixedRate(new TimerTask () {
                    public void run(){
                        GameScreen.timeLeftInMillis=GameScreen.timeLeftInMillis-1000;
                        System.out.println(GameScreen.timeLeftInMillis);
                        if (GameScreen.timeLeftInMillis<= 0) {
                                synchronized (this) {
                                    GameScreen.isGameOver = true;
                                    this.cancel();
                }, 0, 1000L);
                repaint(0, 0, screenWidth, screenHeight);
                serviceRepaints();
        catch (Exception e)
    }Can anyone help me figure out what's wrong with this timer? Any help at all would be appreciated.
Thanks. :)

Answer 1

Problem solved. :)
Comments are welcome. :)
    public void run()
        int millis_per_tick = 100;
        int counter = 1000/millis_per_tick;
        timeLeftInMillis = 180000;
        Thread currentThread = Thread.currentThread();
        try
            // This ends when myThread is set to null, or when
            // it is subsequently set to a new thread; either way, the
            // current thread should terminate.
            while (currentThread == myThread)
                long startTime = System.currentTimeMillis();
                repaint(0, 0, screenWidth, screenHeight);
                serviceRepaints();
                long timeTaken = System.currentTimeMillis() - startTime;
                if (timeTaken < millis_per_tick)
                    synchronized (this)
                        wait(millis_per_tick - timeTaken);
                if (counter == 0) {
                    timeLeftInMillis = timeLeftInMillis - 1000;
                    counter = 1000/millis_per_tick;
                else
                    counter--;
                if (timeLeftInMillis<0) {
                    synchronized(this){
                        isGameOver = true;
        catch (InterruptedException e)
    }