Better way to calculate time than using System.currentTimeMillis()

We are usually used to use System.currentTimeMillis() to calculate the time taken by some method or a piece of code. Ex:

  long startTime = System.currentTimeMillis();

        // Intelligent code which is taking time!

        long endTime = System.currentTimeMillis();

There is a better way to do this:

  import org.apache.commons.lang.time.StopWatch;

  StopWatch timer = new StopWatch();

        timer.start();

  // Intelligent code which is taking time!

  timer.stop();

  log.info("Time taken by load process: " + timer.getTime() + "  milliseconds.");

StopWatch is part of apache's commons-lang jar.