question_017-JAVA之HashMap之LinkedHashMap

JAVA之

HashMap之

LinkedHashMap

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依赖于哈希表和链表的HashMap

哈希表：元素的唯一性

链表：元素的有序性【多次测试输出，顺序保持不变】

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package com.lyMapDemo;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.Set;

/**

* LinkedHashMap 有序的唯一的Map集合

* ，具有可预知的迭代顺序

* @author Jack

*/

public class LinkedHashMapDemo {

public static void main(String[] args) {

// 创建对象

Map<String, String> hm = new
LinkedHashMap<String, String>();

// 加入HashMap

hm.put("11","貂蝉");

hm.put("22","王昭君");

hm.put("33","西施");

hm.put("22","王昭");

// 方式1遍历：键集合

Set<String> set = hm.keySet();

for(String i : set){

// 取值

String s = hm.get(i);

System.out.println(i + "---" + s);

}

}

}

··················结果···············

11---貂蝉

22---王昭

33---西施

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