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Asked: 2026-05-31T23:07:35+00:00

I am using HashMultiMap in my code. My HashMultiMap structure is like, Key1 ->

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I am using HashMultiMap in my code. My HashMultiMap structure is like,

Key1 -> Value11 -> Value12 -> Value13 ….

Key2 -> Value21 -> Value22 ….

Now, I want if key1 has same values (example: value11 = value12) then keep (or do not store) only one copy of the value (example: keep only value11 or do not store value12). Can anybody help me how to achieve this with an efficient (faster) way.

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  1. Editorial Team

    According to the HashMultiMap Javadoc, you chose the right MultiMap for that purpose:

    The multimap does not store duplicate key-value pairs. Adding a new key-value pair equal to an existing key-value pair has no effect.

    Now, you only have to make sure that equals() (and hashCode()) is implemented correctly on your values. I don’t think you should worry about a faster way to do this. The HashMultiMap should be implemented pretty efficiently.

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