Measuring elapsed time with the Apache StopWatch

When it comes to measuring elapsed time often the code written will be directly reliant on System.currentTimeMillis (or System.nanoTime), eg. fairly similar to this:

long startTime  = System.currentTimeMillis();
//processing here...
long endTime = System.currentTimeMillis();
long elapsedTime = endTime-startTime;

works ok … but it’s a bit verbose. Also to get the time in other units than milliseconds will involve writing additional logic to translate the elapsed time into seconds, minutes, hours…

The Apache Commons library StopWatch will save writing all of this additional code. Less code means less bugs.

Stopwatch sw=new Stopwatch();
sw.start();
//processing here...
sw.stop();
System.out.println(sw.elapsedTime(TimeUnit.MICROSECONDS));
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2 thoughts on “Measuring elapsed time with the Apache StopWatch

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