Java中的HashMap中的键的多个值 [英] Multiple values for a key in HashMap in Java

问题描述

是否可以在HashMap中保存与某个键相对应的多个值？如果是的话，怎么样？

Is it possible to keep multiple values corresponding to a key in a HashMap? If yes, how?

推荐答案

是的，这就是所谓的链接。您将尽可能避免链接，特别是如果链条的大小开始增加。更长的链大小将抵消使用散列结构的全部目的，因为目标是尽可能接近O（1）。

Yes, this is called chaining. You will want to avoid chaining as much as possible, especially if the size of the chain starts increasing. Longer chain size will counter the whole purpose of using a hash structure because the goal is to come as close to O(1) as possible.

Map<String, List<String>> hm = new HashMap<String, List<String>>();
List<String> values = new ArrayList<String>();
values.add("Value 1");
values.add("Value 2");
hm.put("Key1", values);

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