Map集合遍历

 1 package com.renjy.test.cn;
 2 
 3 import java.util.HashMap;
 4 import java.util.Iterator;
 5 import java.util.Map;
 6 
 7 public class TestDriver {
 8     public static void main(String args[]) {
 9         Map<String, String> person = new HashMap<String, String>();
10         person.put("1001", "AAAA");
11         person.put("1002", "BBBB");
12         person.put("1003", "CCCC");
13         person.put("1004", "DDDD");
14         person.put("1005", "EEEE");
15 
16         /***
17          * ①通过Map.Entry来遍历（最喜欢）
18          */
19         for (Map.Entry<String, String> entry : person.entrySet()) {
20             System.out.println("Key:" + entry.getKey() + "==>" + "Value:" + entry.getValue());
21         }
22         System.out.println("+++++++++++++++++++++");
23         /***
24          * ②通过遍历Key集合来遍历Map（很多都是基于这个思路的变形，我归结于一大类）
25          */
26         Iterator<String> it = person.keySet().iterator();
27         while (it.hasNext()) {
28             Object obj = it.next();
29             System.out.println(obj + ":" + person.get(obj));
30         }
31         System.out.println("+++++++++++++++++++++");
32         for (String key : person.keySet()) {
33             System.out.println(key + ":" + person.get(key));
34         }
35         System.out.println("+++++++++++++++++++++");
36         /***
37          * ③直接遍历value的集合（但是不能同时的遍历key）
38          */
39         for (String value : person.values()) {
40             System.out.println(value);
41         }
42     }
43 }

 

来源：https://www.cnblogs.com/simpleJokerKing/p/7519143.html