Thread: How to implement CompositeMap class structure in java which is available in the Jakarta Apache Commons Collections?

DataMap is a class structure that maps a single key to multiple values.

I'm supposed to design a class structure called JoinMap which keeps a pair of keys of two DataMaps.

As far as I understood, a JoinMap is meant to join data from two DataMaps into a single view. It somehow reminds of the CompositeMap class structure available in the Jakarta Apache Commons Collections.

Any idea how I should implement this ? Does anyone know how a CompositeMap actually works? Any idea would be appreciated. Thanks.

hello,
I am not sure whether you need a compositeMap or not...all you need is a data structure with a key that would map to the pair of keys of your two other maps..is this correct?
If this is it, then there are many ways to do this...you can define a map which contains keys that points to pairs of keys.
There are other ways..but if you want to stick with maps, this might work for you.