Thread synchronization in java

Good afternoon! I had a problem with thread synchronization in java. I am developing a program that creates timers and allows reset to delete and stop. Just learn how to use streams.

The problem is that the code only gives synchronization for some time ... I can not understand my error. Perhaps my path is wrong, so I would like to know how to solve this problem.

I have the following code:

public class StopWatch
{
    //Create and start our timer
    public synchronized void startClock( final int id )
    {                                 
            //Creating new thread.
            thisThread = new Thread()
            {
                @Override
                 public void run()
                 {
                    try
                    {                                               
                        while( true )
                        {
                            System.out.printf( "Thread [%d] = %d\n", id, timerTime );
                            timerTime  += DELAY;                                        //Count 100 ms
                            Thread.sleep( DELAY );                                      
                        }
                    }
                    catch( InterruptedException ex )
                    {
                        ex.printStackTrace();
                    }
                 }
            };

            thisThread.start();           
    }

…
   //Starting value of timer
   private long timerTime = 0;
   //Number of ms to add and sleep                                      
   private static final int DELAY    = 100;                                  

    private Thread thisThread;
} 

I call this class the following:

StopWatch s = new StopWatch(1);
          s.startClock();
StopWatch s2 = new StopWatch(2);
          s2.startClock();