135 lines
2.9 KiB
Java
135 lines
2.9 KiB
Java
//******************************************************************************
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//
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// File: ElapsedTime.java
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// Package: edu.rit.util
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// Unit: Class edu.rit.util.ElapsedTime
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//
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// This Java source file is copyright (C) 2013 by Alan Kaminsky. All rights
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// reserved. For further information, contact the author, Alan Kaminsky, at
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// ark@cs.rit.edu.
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//
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// This Java source file is part of the Parallel Java 2 Library ("PJ2"). PJ2 is
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// free software; you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation;
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// either version 3 of the License, or (at your option) any later version.
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//
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// PJ2 is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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//
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// A copy of the GNU General Public License is provided in the file gpl.txt. You
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// may also obtain a copy of the GNU General Public License on the World Wide
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// Web at http://www.gnu.org/licenses/gpl.html.
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//
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//******************************************************************************
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package edu.rit.util;
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import java.util.Date;
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/**
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* Class ElapsedTime provides an object that records an interval of elapsed wall
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* clock time.
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*
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* @author Alan Kaminsky
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* @version 06-Jun-2013
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*/
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public class ElapsedTime
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{
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// Hidden data members.
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private long t1;
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private long t2;
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// Exported constructors.
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/**
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* Construct a new elapsed time object. The start time is set to now.
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*/
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public ElapsedTime()
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{
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start();
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}
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// Exported operations.
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/**
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* Set this elapsed time object's start time to now.
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*/
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public void start()
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{
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t2 = t1 = System.currentTimeMillis();
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}
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/**
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* Set this elapsed time object's stop time to now.
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*/
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public void stop()
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{
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t2 = System.currentTimeMillis();
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}
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/**
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* Get this elapsed time object's start time.
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*
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* @return Start time in milliseconds since midnight 01-Jan-1970.
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*/
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public long startTime()
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{
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return t1;
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}
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/**
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* Get this elapsed time object's stop time.
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*
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* @return Stop time in milliseconds since midnight 01-Jan-1970.
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*/
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public long stopTime()
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{
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return t2;
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}
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/**
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* Get this elapsed time object's start time and date.
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*
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* @return Start time and date.
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*/
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public Date startDate()
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{
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return new Date (t1);
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}
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/**
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* Get this elapsed time object's stop time and date.
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*
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* @return Stop time and date.
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*/
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public Date stopDate()
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{
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return new Date (t2);
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}
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/**
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* Get this elapsed time object's elapsed time.
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*
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* @return Elapsed time in milliseconds.
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*/
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public long elapsedTime()
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{
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return t2 - t1;
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}
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/**
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* Returns a string version of this elapsed time object. The string is
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* <TT>"<I>t</I> msec"</TT>.
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*
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* @return String version.
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*/
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public String toString()
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{
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return String.format ("%d msec", t2 - t1);
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}
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}
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