Question

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How to implement a Map with multiple keys?
Multiple Keys to Single Value Map Java

I have to get the value of an enum based on two incoming string attributes. I have been doing this as map for single values. Now I am faced with making a concatenation. Is there a way to have a map have two keys such that I could

Map.get("attr1","attr2");

and this would return the correct enum. Or will I simply have to concatenate all possible values and use this as the key?

I’m searching for the squeaky clean solution (aren’t we all :P)

Answer 1

Well, you could use Map<String, Map<String, YourEnum>>.

We use this a lot and thus made our own Map implementation that provides two keys and internally uses the map-of-maps approach.