【java设计模式】【行为模式Behavioral Pattern】迭代器模式Iterator Pattern

 package com.tn.pattern;

 public class Client {
     public static void main(String[] args) {
         Object[] objs={"飞","雪","连","天","射","白","鹿","笑","书","神"};
         Aggregate aggregate=new ConcreteAggregate(objs);

         Iterator it=aggregate.iterator();
         it.first();
         it.next();
         System.out.println(it.isDone());
         it.currentItem();

         it.first();
         System.out.println("----------------------------------------");
         while(!it.isDone()){
             it.currentItem();
             it.next();
         }
     }
 }

 interface Iterator{
     void first();
     void next();
     boolean isDone();
     void currentItem();
 }

 interface Aggregate{
     Iterator iterator();
 }

 class ConcreteAggregate implements Aggregate{
     private Object[] datas=new Object[10];

     public ConcreteAggregate(Object[] objs){
         this.datas=objs;
     }

     public Iterator iterator(){
         return new ConcreteIterator();
     }

     class ConcreteIterator implements Iterator{
         private int index;
         @Override
         public void first() {
             index=0;
         }
         @Override
         public void next() {
             index++;
         }
         @Override
         public boolean isDone() {
             return index>=datas.length;
         }
         @Override
         public void currentItem() {
             if(index<datas.length)
                 System.out.println(datas[index]);
         }
     }
 }