HashMap嵌套HashMap

HashMap嵌套HashMap

import java.util.HashMap;

import java.util.Set;

 

/*

 *HashMap嵌套HashMap

 *

 * 传智播客

 *             jc      基础班

 *                               陈玉楼              20

 *                               高跃                   22

 *             jy      就业班

 *                               李杰                   21

 *                               曹石磊              23

 *

 * 先存储元素，然后遍历元素

 */

public class HashMapDemo2 {

         publicstatic void main(String[] args) {

                   //创建集合对象

                   HashMap> czbkMap = new HashMap>();

 

                   //创建基础班集合对象

                   HashMap jcMap = new HashMap();

                   //添加元素

                   jcMap.put("陈玉楼",20);

                   jcMap.put("高跃",22);

                   //把基础班添加到大集合

                   czbkMap.put("jc",jcMap);

 

                   //创建就业班集合对象

                   HashMap jyMap = new HashMap();

                   //添加元素

                   jyMap.put("李杰",21);

                   jyMap.put("曹石磊",23);

                   //把基础班添加到大集合

                   czbkMap.put("jy",jyMap);

                  

                   //遍历集合

                   SetczbkMapSet = czbkMap.keySet();

                   for(StringczbkMapKey : czbkMapSet){

                            System.out.println(czbkMapKey);

                            HashMap czbkMapValue = czbkMap.get(czbkMapKey);

                            SetczbkMapValueSet = czbkMapValue.keySet();

                            for(StringczbkMapValueKey : czbkMapValueSet){

                                     IntegerczbkMapValueValue = czbkMapValue.get(czbkMapValueKey);

                                     System.out.println("\t"+czbkMapValueKey+"---"+czbkMapValueValue);

                            }

                   }

         }

}

运行结果：

jc

    高跃---22

    陈玉楼---20

jy

    曹石磊---23

    李杰---21