老师请帮我看一下我代码有什么问题，谢谢了。

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@page import="java.util.List,java.util.ArrayList" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
   <%List<String,String> list=new ArrayList<>();
       list.add("第一条:","jsp基础入门");
       list.add("第二条:","servlet视频详解");
       list.add("第三条:","EL表达式");
       list.add("第四条:","JSTL标签库初识");
       %>
       <%for(<String,String>srt:list){%>
           <div><%out.println(str.getKey());%></div>
       <%} %>
   %>
</body>
</html>

王俩亮 2018-05-12

源自：JSP入门 3-11 自由编程

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2回答

return浪里个浪回答被采纳获得+3积分 2018-05-12 16:10:25

同学，你这个list的集合类是不能存在键值对的吧，应该用HashMap

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王俩亮提问者 #1

您能帮我看一下这个集合前面为什么要加public static ，还有它下面的添加语句为什么也加了一个static。谢谢了 public class DButil{ public static Map<String,Emp> map=new HashMap<String,Emp>(); static{ map.put("101",new Emp("101","AA","123456","AA@imooc.com")); map.put("102",new Emp("102","BB","123456","BB@imooc.com")); map.put("103",new Emp("103","CC","123456","CC@imooc.com")); map.put("104",new Emp("104","DD","123456","DD@imooc.com")); }

2018-05-12 16:29:15
一叶知秋519 回复提问者王俩亮 #2

加static后会跟随类的加载而创建，可以保证在用到这些数据时已经被创建。祝学习愉快！

2018-05-13 12:10:37

提问者王俩亮 2018-05-12 16:30:18

public class DButil{
    public static Map<String,Emp> map=new HashMap<String,Emp>();
    static{
        map.put("101",new Emp("101","AA","123456","AA@imooc.com"));
        map.put("102",new Emp("102","BB","123456","BB@imooc.com"));
        map.put("103",new Emp("103","CC","123456","CC@imooc.com"));
        map.put("104",new Emp("104","DD","123456","DD@imooc.com"));
    }

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