test/CollectionsSpeedTest.java
author František Kučera <franta-hg@frantovo.cz>
Tue Oct 11 00:38:41 2011 +0200 (2011-10-11)
changeset 68 6e16e3bee1ca
permissions -rwxr-xr-x
Drupal: částečně funkční – jde stáhnout zprávy s předmětem a textem.
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/*
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 *   StarOffice News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package test;
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import java.util.ArrayList;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.ListIterator;
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/**
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 * Tests the speed of LinkedList and ArrayList.
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 * @author Christian Lins
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 * @since sonews/0.5.0
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 */
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public class CollectionsSpeedTest 
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{
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  public static void main(String[] args)
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  {
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    List arrayList  = new ArrayList();
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    List linkedList = new LinkedList();
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    int numElements = 100000;
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    System.out.println("ArrayList.add(): " + add(arrayList, numElements) + "ms");
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    System.out.println("LinkenList.add(): " + add(linkedList, numElements) + "ms");
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    System.out.println("ArrayList.iterate: " + iterate(arrayList) + "ms");
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    System.out.println("LinkedList.iterate: " + iterate(linkedList) + "ms");
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  }
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  private static long add(List list, int numElements)
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  {
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    long start = System.currentTimeMillis();
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    for(int n = 0; n < numElements; n++)
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    {
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      list.add(new Object());
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    }
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    return System.currentTimeMillis() - start;
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  }
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  private static long iterate(List list)
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  {
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    long start = System.currentTimeMillis();
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    ListIterator iter = list.listIterator();
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    while(iter.hasNext())
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    {
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      iter.next();
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    }
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    return System.currentTimeMillis() - start;
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  }
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}