stopwatch.start();

if(stopwatch.isRunning())
    System.out.println("Stopwatch started");

//... do something

stopwatch.stop();

if(!stopwatch.isRunning())
    System.out.println("Stop");

System.out.println("Elapsed time: " + stopwatch);
System.out.println("in nanoseconds: " + stopwatch.nanosecondsElapsed());
System.out.println("in milliseconds: " + stopwatch.millisecondsElapsed());
System.out.println("in seconds: " + stopwatch.secondsElapsed());
System.out.println("in minutes: " + stopwatch.minutesElapsed());

stopwatch.reset();