集合(Map扩展)

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map扩展知识。

map集合被使用是因为具备映射关系

"yureban" "01" "zhangsan";

"yureban" "02" "lisi";

"jiuyeban" "01" "wangwu";

"jiuyeban" "02" "zhaoliu";

import java.util.*;class MapDemo3{    public static void main(String[] args)    {        HashMap<String,HashMap<String,String>> czbk = new HashMap<String,HashMap<String,String>>();                 HashMap<String,String> yure = new HashMap<String,String>();                 HashMap<String,String> jiuye = new HashMap<String,String>();                 czbk.put("yureban",yure);        czbk.put("jiuyeban",jiuye);                 yure.put("01","zhangsan");        yure.put("02","lisi");                      jiuye.put("01","zhaoliu");        jiuye.put("02","wangwu");                 //遍历czbk集合。获取所有的教室        Iterator<String> it = czbk.keySet().iterator();                 while(it.hasNext())        {            String roomName = it.next();            HashMap<String,String> room = czbk.get(roomName);                         System.out.println(roomName);            getStudentInfo(room);        }                 // getStudentInfo(jiuye);        // getStudentInfo(yure);    }    public static void getStudentInfo(HashMap<String,String> roomMap)    {        Iterator<String> it = roomMap.keySet().iterator();                 while(it.hasNext())        {            String id = it.next();            String name = roomMap.get(id);            System.out.println(id+":"+name);        }    }}

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