泛型第四课，自定义实现迭代器、深入迭代器、迭代器原理，面向对象

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package com.pkushutong.genericity4;import java.util.Iterator;/*** 简化迭代器原理* @author dell**/
public class Array2 implements java.lang.Iterable<String>{private String[] elem = {"a","b","c","d","e","f","g"};private int size = elem.length;public class MyIt implements Iterator<String>{//游标private int cursor = -1;//判断是否存在下一个元素public boolean hasNext(){return cursor + 1< size;}//获取下一个元素public String next(){cursor++;return elem[cursor];}//删除元素public void remove(){}}public Iterator<String> iterator(){return new MyIt();}public static void main(String[] args) {Array2 list = new Array2();Iterator it = list.iterator();while(it.hasNext()){String str = (String) it.next();System.out.println(str);}//增强for循环，必须实现java.lang.Iterable接口，重写iterator方法for (String st : list) {System.out.println(st);}}
}

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