code: public double getThroughput(int theNumOperations, TimeUnit theUnit) {
  		if (theNumOperations <= 0) {
  			return 0.0f;
  		}
  
  		long millisElapsed = Math.max(1, getMillis());
  		long periodMillis = theUnit.toMillis(1);
  
  		double numerator = theNumOperations;
  		double denominator = ((double) millisElapsed) / ((double) periodMillis);
  
  		return numerator / denominator;
  	}
docs: Determine the current throughput per unit of time (specified in theUnit)
  assuming that theNumOperations operations have happened.
  <p>
  For example, if this stopwatch has 2 seconds elapsed, and this method is
  called for theNumOperations=30 and TimeUnit=SECONDS,
  this method will return 15
  </p>
  
  @see #formatThroughput(int, TimeUnit)