iteratordemo.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter8;

import java.util.*;

class IteratorDemo
{
    public static void main(String args[])
    {
        ArrayList al = new ArrayList();
        al.add("C");
        al.add("A");
        al.add("E");
        al.add("B");
        System.out.print("Original contents of al: ");
        Iterator itr = al.iterator();
        while(itr.hasNext())
        {
            Object element = itr.next();
            System.out.print(element + " ");
        }
        System.out.println();
        ListIterator litr = al.listIterator();
        while(litr.hasNext())
        {
            Object element = litr.next();
            litr.set(element + "+");
        }
        System.out.print("Modified contents of al: ");
        itr = al.iterator();
        while(itr.hasNext())
        {
            Object element = itr.next();
            System.out.print(element + " ");
        }
        System.out.println();
        System.out.print("Modified list backwards: ");
        while(litr.hasPrevious())
        {
            Object element = litr.previous();
            System.out.print(element + " ");
        }
        System.out.println();
    }
}