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[Information] Map with multiple keys

 
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Did you ever need a map (kind of structure) with multiple keys to value? I needed this kind of implementation. I googled for that and came across Apache Commons and they have a class MultiKeyMap.

I thought it might be helpful so put it here and also so that it gets archived on internet.
 
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That looks pretty useful, better than some of the nested HashMap/ArrayList/HashMap structures I've run across before
 
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