traversecustomlist.java

Java程序设计技巧与开发实例附书源代码。

public class TraverseCustomList
{
    public static void main(String args[])
    {
        int SIZE = 10000;
        System.out.println("Creating list ...");
        List list = new List();
        for (int i = 0; i < SIZE; i++)
        {
            list.insert(new Double(Math.random()));
        }
        System.out.println("Computing average ...");
        try
        {
            long start = System.currentTimeMillis();
            double sum = 0.0;
            list.first();
            while (!list.isLast())
            {
                sum += ( (Double) list.retrieve()).doubleValue();
                list.next();
            }
            sum += ( (Double) list.retrieve()).doubleValue();
            long stop = System.currentTimeMillis();
            System.out.println("Average: " + sum / SIZE);
            System.out.println("Time   : " + (stop - start));
        }
        catch (ListException le)
        {
            System.err.println("List Exception: " + le);
        }
    }
}