package com.test;import java.util.ArrayList;
import java.util.Iterator;//集合三种遍历方式
/** iterator的操作是有限的，只能对元素进行判断、取出、删除操作* 如果进行其他操作用ListIterator* */
public class Array_list {public static void main(String[] args) {ArrayList<String> arrayList = new ArrayList<String>();arrayList.add("1");arrayList.add("2");arrayList.add("3");arrayList.add("4");for (Object object : arrayList) {System.out.println(object);}System.out.println("---------------------------");Iterator<String> it = arrayList.iterator();while(it.hasNext()){System.out.println(it.next());}System.out.println("---------------------------");for(Iterator<String> i = arrayList.iterator() ; i.hasNext() ;){System.out.println(i.next());}}
}