public class StopWatch
{
	// private data fields
    private float startTime;
    private float endTime;

	// getter methods	
    public float getStartTime(){
       return startTime;
    }

    public float getEndTime()
    {
        return endTime;
    }
	
    // no - arg constructor
	public StopWatch()
    {

    }
	
	// start method
    public void start(float startTime)
    {
        this.startTime = startTime;
    }
	
	//stop method
    public void stop(float endTime)
    {
        this.endTime = endTime;
    }

	// elpsed time method
    public float getElapsedTime()
    {
        return  ((endTime - startTime) * 1000);
    }
}