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The API can be extended with a thousand more classes; just because that is possible does not mean it should happen. Posting about such possibilities is not really productive anyway, or did you think the Java designers read here?
Apache also created a nice pile of additional collection classes for you to sniff through:
1. A collection called Table, which will hold objects in table format.Map<K, List<V>>
2.above one can be in mutable and immutable flavours.Collections.unmodifiableMap(), Collections.synchronizedMap().
3. MutliDimentionalTable collection.Map<K, List<List<V>>>.
Your suggestions are redundant.
Where Tuple is an appropriate type representing the indices like a pair thereof for the two-dimensional case.