Multimap之爪哇Multimap之 - 群归类时间表 [英] Multimap of Multimap Java - Categorize timetable

问题描述

我已经解析的HTML时间表和加载每一个问题我的类对象。
所以，我有我的学科ArrayList中有名字的信息，教师，...，小时，天
现在我想重建表，所以我需要先对其进行分类。我认为最是有结构是这样的：

I have parsed a HTML timetable and loaded every Subject to my class object. So i have arrayList of my Subjects which has information of name, teacher,... ,HOUR, and DAY now i want to reconstruct the table and so I need to categorize it first. I think that best would be to have structure like this:

Monday: 1: Math, Czech, ...
        2: History
        ...
Tuesday: 1: English, Geo
         2...
...

可能有多个科目给出小时，所以我试图用Multimap之的Multimap之，但我在我不能宣布它我的解析。

There can be mutiple subjects in given hour, therefore I tried to used Multimap of Multimap, but I am not able to declare it during my for parsing.

Multimap<String, Multimap<String, Subject>> timetable = HashMultimap.create();
...
for ...
    timetable.put(subject.den, new HashMultimap<>(subject.hod, subject));

但它说，HashMultimap设有私人accesin com.google.common ...
我不知道如何正确地写。我也想用数组，但我不得不pre-声明它，我想一​​个周期内建立这个。
有任何想法吗？谢谢你在前进

but it says that HashMultimap has private accesin com.google.common... I dont know how to correctly write this. I was also thinking about using Array, but I would have to pre-declare it and I would like to build this during one for cycle. Any ideas? Thank you in advance

推荐答案

它看起来像你想要的其实更多的地图＆LT;弦乐，Multimap之＆LT;弦乐，主题和GT;＆GT; ，在这种情况下，你希望

It looks like what you want is actually more of a Map<String, Multimap<String, Subject>>, in which case you want

 Map<String, Multimap<String, Subject>> timetable = new HashMap<>();
 for ...
   Multimap<String, Subject> multimap = timetable.get(subject.den);
   if (multimap == null) {
     multimap = HashMultimap.create();
     timetable.put(subject.den, multimap);
   }
   multimap.put(subject.hod, subject);

这篇关于Multimap之爪哇Multimap之 - 群归类时间表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！