traverselinkedlistwithiterator.java

Java程序设计技巧与开发实例附书源代码。

import java.util.*;

public class TraverseLinkedListWithIterator
{
    public static void main(String args[])
    {
        int SIZE = 10000;
        System.out.println("Creating list ...");
        LinkedList list = new LinkedList();
        for (int i = 0; i < SIZE; i++)
        {
            list.add(new Double(Math.random()));
        }
        System.out.println("Computing average ...");
        long start = System.currentTimeMillis();
        double sum = 0.0;
        for (Iterator iterator = list.iterator(); iterator.hasNext(); )
        {
            sum += ( (Double) iterator.next()).doubleValue();
        }
        long stop = System.currentTimeMillis();
        System.out.println("Average: " + sum / SIZE);
        System.out.println("Time   : " + (stop - start));
    }
}