如何将字符串拆分为带有值列表的映射? [英] How to split a string into a map with a list of values?

问题描述

我对我的应用程序有些困惑，而且我不确定要搜索什么.所以我希望这里有人可以帮助我.

I am a bit stuck with my application, and I am not quite sure what to search for. So I am hoping someone here may help me out.

我有一个String的列表，看起来像这样:

I have a list of Strings, that looks like this:

Cake;carrot
Cake;apple
Cake;spicy
Pizza;pepperoni
Pizza;mozzarella

...等等.我想将此数据放入Map<String, List<String>>，其中Cake和Pizza将构成我的Map中的键.将[carrot, apple, spicy]作为Cake的值，并且将[pepperoni, mozzarella]作为Pizza的值.

... and so on. I want to put this data into a Map<String, List<String>>, where Cake and Pizza will make up the keys in my Map. Having [carrot, apple, spicy] as Cake's values, and [pepperoni, mozzarella] as Pizza's values.

我该如何实现?预先感谢您的帮助.

How may I achieve this? Thanks in advance for any help.

推荐答案

只需使用String.split()

ArrayList<String> myList;
HashMap<String, List<String>> myMap = new HashMap<>();
for(String s : myList)
{
   String[] split = s.split(";");
   List<String> bucket = myMap.get(split[0]);
   if(bucket == null) 
   {
       bucket = new ArrayList<String>();
       myMap.put(split[0], bucket);
   }

   bucket.add(split[1]);
}

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