| package cn.itcast.demo17; import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set; public class Test {
public static void main(String[] args) {
//定义网络组集合
Map<String,String> wangluozu = new HashMap<String,String>();
wangluozu.put("001", "liupc");
wangluozu.put("002", "lijing"); //定义电磁组集合
Map<String,String> diancizu = new HashMap<String,String>();
diancizu.put("001", "liubo");
diancizu.put("002", "guoshaoying");
//定义四室集合
Map<String,Map<String,String>> sishi = new HashMap<String,Map<String,String>>();
sishi.put("网络组", wangluozu);
sishi.put("电磁组", diancizu);
//查看四室网络组001号学生
String str = sishi.get("网络组").get("001");
System.out.println(str);
System.out.println("--------------");
//遍历四室电磁组的学生:keySet()方式
for(String no : sishi.get("电磁组").keySet()){
System.out.println(no + "..." + sishi.get("电磁组").get(no));
}
System.out.println("--------------");
//遍历四室电磁组的学生：entry方式
Set<Entry<String,String>> set = sishi.get("电磁组").entrySet();
for(Entry<String,String> entry:set){
System.out.println(entry.getKey()+"..."+entry.getValue());
}
System.out.println("--------------");
//遍历四室的学生：keySet()方式
Set<String> set_sishi = sishi.keySet();
for(String zuName :set_sishi){
Map<String,String> map = sishi.get(zuName);
Set<String> set_zu = map.keySet();
for(String no:set_zu){
String name = map.get(no);
System.out.println(zuName + "..." + no + "..." + name);
}
}
System.out.println("--------------");
//遍历四室的学生：Entry方式
Set<Map.Entry<String,Map<String,String>>> entrySet1 = sishi.entrySet();
for(Map.Entry<String,Map<String,String>> entry2:entrySet1){
String zuName1 = entry2.getKey();
Map<String,String> map2 = entry2.getValue();
Set<Map.Entry<String,String>> entrySet2 = map2.entrySet();
for(Map.Entry<String,String> entry3:entrySet2){
String no1 = entry3.getKey();
String name1 = entry3.getValue();
System.out.println(zuName1 + "..." + no1 + "..." + name1);
}
}
}
}
|
