【Java学习笔记】HashMap子接口---LinkedHashMap

特点：

　　　　存入元素的顺序与取出元素的顺序相同（与LinkedHashSet类似）

 1 import java.util.HashMap;
 2 import java.util.Iterator;
 3 import java.util.LinkedHashMap;
 4 import java.util.Map;
 5 
 6 public class LinkedHashMapDemo {
 7 
 8     public static void main(String[] args) {
 9         HashMap<Integer,String> hm = new LinkedHashMap<Integer,String>();
10         
11         hm.put(7, "zhouqi");
12         hm.put(3, "zhangsan");
13         hm.put(1, "qianyi");
14         hm.put(5, "wangwu");
15         
16         Iterator<Map.Entry<Integer,String>> it = hm.entrySet().iterator();
17         
18         while (it.hasNext())
19         {
20             Map.Entry<Integer, String> me = it.next();
21             Integer key = me.getKey();
22             String value = me.getValue();
23             
24             System.out.println(key+":"+value);
25         }
26 
27     }
28 
29 }