Java Programming

Hi all I wanted to get the opinion of some more advanced developers to see what they thought of my structure.

I am an need of a structure to keep track of categorizations. I was thinking that a tree would make sense. I am presented with a 1 to many on each level
Ie in there may be 6 items in the first level and each of those things would have a few items below them, repeat for approx 4 more levels.

Does a tree seem like the most reasonable structure to be using in this particular situation. Is there a better structure that has evaded my thoughts ?

thanks for all the suggestions.