state of an object in setUp() of junit TestCase

If I forget to define a tearDown() method ,will an object initialized
in setUp() maintain its state in between two test methods?
suppose I am testing a Stopwatch class
<code>
public class Stopwatch {
    public long startTime=0;
    public long stopTime=0;
    boolean isrunning=false;
    public void start(){
        startTime=System.currentTimeMillis();
        isrunning=true;
    }
    public void stop(){
        if (isrunning) stopTime=System.currentTimeMillis();
        isrunning=false;
    }

    public long getTotalDurationMilliSeconds(){
        long duration=0;
        if( isrunning){
            duration=(System.currentTimeMillis()-startTime);
        }
        else{
            duration=stopTime-startTime;
        }
        return duration;
    }
    public void reset(){
        startTime=0;
        stopTime=0;
        isrunning=false;
    }

    public long getTotalDurationSeconds(){
        long duration=0;
        if( isrunning){
            duration=((System.currentTimeMillis()-startTime)/1000);
        }
        else{
            duration=(stopTime-startTime)/1000;
        }
        return duration;
    }
}

</code>

I have a testcase like below,in which I have a setUp() but no
tearDown()

<code>
class StopwatchTest extends TestCase{
    private Stopwatch watch;
    public StopwatchTest(String name){
        super(name);
    }
    public void setUp(){
        watch=new Stopwatch();
    }
    private void sleepForSomeTime(long timeinmillisecs){
        try{
            System.out.println("sleeping for :"+(timeinmillisecs/1000)+"secs");
            Thread.sleep(timeinmillisecs);
        }catch(InterruptedException e){

        }
    }
    public void testNormalOpButForgottToStop(){
        watch.start();
        sleepForSomeTime(3000);
        //watch is not stopped;
        assertEquals(3,watch.getTotalDurationSeconds());
    }
    public void testStoppedBeforeStart(){
        System.out.println("timeduration:"+watch.getTotalDurationSeconds());
        sleepForSomeTime(2000);
        watch.stop();
        System.out.println("timeduration:"+watch.getTotalDurationSeconds());
        assertEquals(0,watch.getTotalDurationSeconds());
    }

}

</code>

It seems that the watch is initialized each time before running the
test methods.Is this the expected behaviour?

regards,
jim