Stopwatch.java

//From: https://github.com/cgoldberg/netplot/blob/0cdac581460f70a3d39929ffb5a2635a9eb16320/src/Stopwatch.java

/*
 *  Copyright 2006 Corey Goldberg (cgoldberg _at_ gmail.com)
 *
 *  This file is part of NetPlot.
 *
 *  NetPlot 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.
 *
 *  NetPlot 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.
 */
 

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() {
        if (running) {
            return System.currentTimeMillis() - startTime;
        }
        return stopTime - startTime;
    }
    
    
    // elaspsed time in seconds
    public long getElapsedTimeSecs() {
        if (running) {
            return ((System.currentTimeMillis() - startTime) / 1000);
        }
        return ((stopTime - startTime) / 1000);
    }

    
    
    
    // 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());
    }
  
  /*
  
  final int MSG_START_TIMER = 0;
  final int MSG_STOP_TIMER = 1;
  final int MSG_UPDATE_TIMER = 2;
  
  Stopwatch timer = new Stopwatch();
  final int REFRESH_RATE = 100;
  
  Handler mHandler = new Handler()
    {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
            case MSG_START_TIMER:
                timer.start(); //start timer
                mHandler.sendEmptyMessage(MSG_UPDATE_TIMER);
                break;

            case MSG_UPDATE_TIMER:
                tvTextView.setText(""+ timer.getElapsedTime());
                mHandler.sendEmptyMessageDelayed(MSG_UPDATE_TIMER,REFRESH_RATE); //text view is updated every second, 
                break;                                  //though the timer is still running
            case MSG_STOP_TIMER:
                mHandler.removeMessages(MSG_UPDATE_TIMER); // no more updates.
                timer.stop();//stop timer
                tvTextView.setText(""+ timer.getElapsedTime());
                break;

            default:
                break;
            }
        }
    };
    
    public void onClick(View v) {
        if(btnStart == v)
        {
            mHandler.sendEmptyMessage(MSG_START_TIMER);
        }else
        if(btnStop == v){
            mHandler.sendEmptyMessage(MSG_STOP_TIMER);
        }
    }
  
  
  */

}