public abstract class Aggregate { public abstract Iterator createIterator(); }public class ConcreteAggregate extends Aggregate { private String[] ss = null;//示意，表示聚合對象具體的內(nèi)容 public ConcreteAggregate(String[] ss){this.ss = ss;} public Iterator createIterator() {//實(shí)現(xiàn)創(chuàng)建Iterator的工廠方法return new ConcreteIterator(this);}public Object get(int index){Object retObj = null;if(index < ss.length){retObj = ss[index];}return retObj;}public int size(){return this.ss.length;} }public interface Iterator { public void first(); public void next(); public boolean isDone(); public Object currentItem(); }public class ConcreteIterator implements Iterator { private ConcreteAggregate aggregate; private int index = -1; public ConcreteIterator(ConcreteAggregate aggregate) {this.aggregate = aggregate;} public void first(){index = 0;}public void next(){if(index < this.aggregate.size()){index = index + 1;}}public boolean isDone(){if(index == this.aggregate.size()){return true;}return false;}public Object currentItem(){return this.aggregate.get(index);} }client:String[] names = {"張三","李四","王五"};//創(chuàng)建聚合對象Aggregate aggregate = new ConcreteAggregate(names);//循環(huán)輸出聚合對象中的值Iterator it = aggregate.createIterator();//首先設(shè)置迭代器到第一個元素it.first();while(!it.isDone()){//取出當(dāng)前的元素來Object obj = it.currentItem();System.out.println("the obj=="+obj);//如果還沒有迭代到最后，那么就向下迭代一個it.next();}

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