Multimap Java的Multimap - 分类时间表 [英] Multimap of Multimap Java - Categorize timetable

问题描述

我已经解析了一个 HTML 时间表并将每个主题加载到我的类对象中.所以我有我的科目的数组列表，其中包含姓名、老师、...、HOUR 和 DAY 的信息现在我想重建表格，所以我需要先对它进行分类.我认为最好的结构是这样的:

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...
...

在给定的时间内可以有多个主题，因此我尝试使用 Multimap 的 Multimap，但我无法在解析时声明它.

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 有私人访问 com.google.common...我不知道如何正确地写这个.我也在考虑使用 Array，但我必须预先声明它，我想在一个循环中构建它.有任何想法吗?提前谢谢您

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

看起来你想要的其实更多的是一个Map，其中你想要的情况

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);

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