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This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software
 * License version 1.1, a copy of which has been included with this
 * distribution in the LICENSE.txt file.  */

package org.apache.log4j.performance;

/**
   Measures the time required to make a System.currentTimeMillis() and
   Thread.currentThread().getName() calls.

   

On an 233Mhz NT machine (JDK 1.1.7B) the System.currentTimeMillis() call takes under half a microsecond to complete whereas the Thread.currentThread().getName() call takes about 4 micro-seconds. */ public class SystemTime { static int RUN_LENGTH = 1000000; static public void main(String[] args) { double t = systemCurrentTimeLoop(); System.out.println("Average System.currentTimeMillis() call took " + t); t = currentThreadNameloop(); System.out.println("Average Thread.currentThread().getName() call took " + t); } static double systemCurrentTimeLoop() { long before = System.currentTimeMillis(); long l; for(int i = 0; i < RUN_LENGTH; i++) { l = System.currentTimeMillis(); } return (System.currentTimeMillis() - before)*1000.0/RUN_LENGTH; } static double currentThreadNameloop() { long before = System.currentTimeMillis(); String t; for(int i = 0; i < RUN_LENGTH; i++) { t = Thread.currentThread().getName(); } return (System.currentTimeMillis() - before)*1000.0/RUN_LENGTH; } }

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