StopWatch.java

/*
  Copyright (c) 2005, Corey Goldberg

  StopWatch.java 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.
*/

public class StopWatch {
    
    private long startTime = 0;
    private long stopTime = 0;
    private boolean running = false;

    public void start() {
        this.startTime = System.currentTimeMillis();
        this.running = true;
    }
    
    public void stop() {
        this.stopTime = System.currentTimeMillis();
        this.running = false;
    }

    /* Elaspsed time in milliseconds */
    public long getElapsedTime() {
        long elapsed;
        if (running) {
            elapsed = (System.currentTimeMillis() - startTime);
        }
        else {
            elapsed = (stopTime - startTime);
        }
        return elapsed;
    }
        
    /* Elaspsed time in seconds */
    public long getElapsedTimeSecs() {
        long elapsed;
        if (running) {
            elapsed = ((System.currentTimeMillis() - startTime) / 1000);
        }
        else {
            elapsed = ((stopTime - startTime) / 1000);
        }
        return elapsed;
    }

    /* Sample usage */
    public static void main(String[] args) {
        StopWatch s = new StopWatch();
        s.start();
        //code you want to time goes here
        s.stop();
        System.out.println("elapsed time in milliseconds: " + s.getElapsedTime());
    }
}