stopwatch.java

个人感觉非常不错的poleperst-acid

/* 
This file is part of the PolePosition database benchmark
http://www.polepos.org

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA  02111-1307, USA. */

package org.polepos.framework;

/**
 * @author Herkules
 */
public class StopWatch
{
	private long startNanos;
	private long nanosEllapsed;

	public void start()
	{
		startNanos = System.nanoTime();
	}

	public void stop()
	{
		nanosEllapsed = System.nanoTime() - startNanos;
	}

	public long millisEllapsed()
	{
		return nanosEllapsed / 1000000;
	}

	public String toString()
	{
		return "" + millisEllapsed() + "ms";
	}
	
}