benchmark lol

benchmark.java

final long start = System.currentTimeMillis();
// some process
final long end = System.currentTimeMillis();
final long result = end - start;

final String format = String.format("%02d min, %02d sec",
        TimeUnit.MILLISECONDS.toMinutes(result),
        TimeUnit.MILLISECONDS.toSeconds(result) -
                 TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(result)));

System.out.println("Process time is " + format);