<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:aop="http://www.springframework.org/

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/j

import java.util.ArrayList;import java.util.Iterator;/*arraylist 存储数据是有序的 可重复的，适合查询 遍历****/public class arrayListDemo {public static void main(String[] args) {ArrayList list=new ArrayList();//添加元素list