我如何在Java中使用重复键创建HashMap？ [英] How can i have a HashMap in Java with duplicate keys?

问题描述

所以我决定使用一个来存储一个对，一个键和一个值。 HashMap< String，String> ，但我注意到当我尝试添加一个已经存在的键时，前一个键（键值）被新键替换（NewKey，NewValue）入口丢失。所以当我有重复的键时，以前的键被替换为新的键。

如何使用重复键的HashMap？

解决方案

您需要 MultiMap ，
查看 Google Guava Multimap

I need a collection in Java that is going to store a pair, a key and a value.

So I decided to use a HashMap<String,String>, but I noticed that when I try to add a key that already exists, the previous (key,value) is replaced by the new one (NewKey,NewValue) and the previous entry is lost. So when I have duplicate keys, the previous key is replaced by the new one.

How can I have a HashMap with duplicate keys?

解决方案

you need MultiMap, take a look at Google Guava Multimap

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