java基础入门---Map扩展

import java.util.*;

class Map扩展
{
public static void sop(Object obj)
{
System.out.println(obj);
}

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("yure", yure);
czbk.put("jiuye", jiuye);

yure.put("01", "zhangsan");
yure.put("02", "lisi");

jiuye.put("05","dd");
jiuye.put("06","ud");

//遍历czbk集合，获取所有教室
Iterator<String> it = czbk.keySet().iterator();
while(it.hasNext())
{
String roomName = it.next();
HashMap<String,String> room = czbk.get(roomName);
sop(roomName);
getStuInfo(room);
}

}
public static void getStuInfo(HashMap<String,String> roomMap)
{
Iterator<String> it = roomMap.keySet().iterator();
while(it.hasNext())
{
String id = it.next();
String name = roomMap.get(id);
sop(id+"...."+name);
}
}
}