public double elapsedTime(){
  long now=threadTimer.getCurrentThreadCpuTime();
  return (now - start) / NANOSECONDS_PER_SECOND;
}

public double elapsedTime ( ) { long now = threadTimer . getCurrentThreadCpuTime ( ) ; return ( now - start ) / NANOSECONDS_PER_SECOND ; }
returns the elapsed cpu time ( in seconds ) since the stopwatch was created .
