Java Tutorial/Apache Common/StopWatch

StopWatch

   <source lang="java">

/*

* ========================================================================
* 
* Copyright 2005 Tim O"Brien.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* 
*   http://www.apache.org/licenses/LICENSE-2.0
* 
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* 
* ========================================================================
*/

import java.text.NumberFormat; import org.apache.rumons.lang.time.StopWatch; public class MainClass {

 public static void main(String[] args) {
   StopWatch clock = new StopWatch();
   NumberFormat format = NumberFormat.getInstance();
   
   System.out.println( "How long does it take to take the sin of 0.34 ten million times?" );
   clock.start();
   for( int i = 0; i < 100000000; i++ ) {
     Math.sin( 0.34 );
   }
   clock.stop();
   System.out.println( "It takes " + clock.getTime() +
                   " milliseconds" );
   System.out.println( "How long does it take to multiply 2 doubles one billion times?" );
   clock.reset();
   clock.start();
   for( int i = 0; i < 1000000000; i++) {
     double result = 3423.2234 * 23e-4;
   }
   clock.stop();
   System.out.println( "It takes " + clock.getTime() + " milliseconds." );
   System.out.println( "How long does it take to add 2 ints one billion times?" );
   clock.reset();
   clock.start();
   for( int i = 0; i < 1000000000; i++) {
     int result = 293842923 + 33382922;
   }
   clock.stop();
   System.out.println( "It takes " + clock.getTime() + " milliseconds." );
   
   System.out.println( "Testing the split() method." );
   clock.reset();
   clock.start();
   try { Thread.sleep(1000); } catch( Exception e ) {}
   clock.split();
   System.out.println( "Split Time after 1 sec: " + clock.getTime() );
   try { Thread.sleep(1000); } catch( Exception e ) {}
   System.out.println( "Split Time after 2 sec: " + clock.getTime() );
   clock.unsplit();
   try { Thread.sleep(1000); } catch( Exception e ) {}
   System.out.println( "Time after 3 sec: " + clock.getTime() );
   
 }

}</source>

How long does it take to take the sin of 0.34 ten million times?
It takes 5766 milliseconds
How long does it take to multiply 2 doubles one billion times?
It takes 2734 milliseconds.
How long does it take to add 2 ints one billion times?
It takes 2703 milliseconds.
Testing the split() method.
Split Time after 1 sec: 1000
Split Time after 2 sec: 2000
Time after 3 sec: 3000