What exactly are you trying to store, and how do you intend to access it?

For starters, you may be interested in reading about multi-dimensional
arrays:

http://java.sun.com/docs/books/tutorial/java/data/multiarrays.html

You should also read up on collections here:

http://java.sun.com/docs/books/tutorial/collections/

HTH,
Carl.

Yes, the obvious ones:

* Use Maps of Maps - inefficient

or

* Combine the two keys into one object, using that as a key in a Map.
Which is the way multidimensional hashs are usually implemented.

/Thomas