Timer.java Source code

Introduction

Here is the source code for Timer.java

Source

/*
 * This code is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public 
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This code 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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 no.geosoft.cc.util;

import java.util.Date;

/**
 * Class for program event timing.
 * Usage:
 *
 *   <pre>
 *   Timer timer = new Timer();
 *
 *   // do stuff
 *
 *   System.out.println (timer);  // prints time elapsed since
 *                                // object was created.
 *   </pre>
 * 
 * @author <a href="mailto:jacob.dreyer@geosoft.no">Jacob Dreyer</a>
 */
public class Timer {
    private Date start_;

    /**
     * Start timer.
     */
    public Timer() {
        reset();
    }

    /**
     * Returns exact number of milliseconds since timer was started.
     * 
     * @return  Number of milliseconds since timer was started.
     */
    public long getTime() {
        Date now = new Date();
        long nMillis = now.getTime() - start_.getTime();

        return nMillis;
    }

    /**
     * Restarts the timer.
     */
    public void reset() {
        start_ = new Date(); // now    
    }

    /**
     * Returns a formatted string showing the elaspsed time
     * suince the instance was created.
     * 
     * @return  Formatted time string.
     */
    public String toString() {
        long nMillis = getTime();

        long nHours = nMillis / 1000 / 60 / 60;
        nMillis -= nHours * 1000 * 60 * 60;

        long nMinutes = nMillis / 1000 / 60;
        nMillis -= nMinutes * 1000 * 60;

        long nSeconds = nMillis / 1000;
        nMillis -= nSeconds * 1000;

        StringBuffer time = new StringBuffer();
        if (nHours > 0)
            time.append(nHours + ":");
        if (nHours > 0 && nMinutes < 10)
            time.append("0");
        time.append(nMinutes + ":");
        if (nSeconds < 10)
            time.append("0");
        time.append(nSeconds);
        time.append(".");
        if (nMillis < 100)
            time.append("0");
        if (nMillis < 10)
            time.append("0");
        time.append(nMillis);

        return time.toString();
    }

    /**
     * Testing this class.
     * 
     * @param args  Not used.
     */
    public static void main(String[] args) {
        Timer timer = new Timer();

        for (int i = 0; i < 100000000; i++) {
            double b = 998.43678;
            double c = Math.sqrt(b);
        }

        System.out.println(timer);
    }
}