Used for timing events with millisecond precision.

        

/*********************************************************************
 * Used for timing events with millisecond precision.
 * 
 * @version 2001-07-03
 * @since 2001-07-03
 * @author <a href="http://croftsoft.com/">David Wallace Croft</a>
 *********************************************************************/

public final class Stopwatch

// ////////////////////////////////////////////////////////////////////
// ////////////////////////////////////////////////////////////////////
{

  private long elapsedTime;

  private boolean isTicking;

  private long startTime;

  // ////////////////////////////////////////////////////////////////////
  // ////////////////////////////////////////////////////////////////////

  /*********************************************************************
   * Returns the elapsed time in milliseconds.
   *********************************************************************/
  public synchronized long getElapsedTime()
  // ////////////////////////////////////////////////////////////////////
  {
    if (isTicking) {
      return System.currentTimeMillis() - startTime;
    } else {
      return elapsedTime;
    }
  }

  // ////////////////////////////////////////////////////////////////////
  // ////////////////////////////////////////////////////////////////////

  public synchronized void reset()
  // ////////////////////////////////////////////////////////////////////
  {
    elapsedTime = 0;

    isTicking = false;
  }

  public synchronized void start()
  // ////////////////////////////////////////////////////////////////////
  {
    if (isTicking) {
      throw new IllegalStateException("already started");
    }

    isTicking = true;

    startTime = System.currentTimeMillis();
  }

  public synchronized void stop()
  // ////////////////////////////////////////////////////////////////////
  {
    if (!isTicking) {
      throw new IllegalStateException("not started");
    }

    elapsedTime = System.currentTimeMillis() - startTime;

    isTicking = false;
  }

  // ////////////////////////////////////////////////////////////////////
  // ////////////////////////////////////////////////////////////////////
}

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Used for timing events with millisecond precision. : Timer « Development Class « Java

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