creating a hierarchical structure of text mining results

My project currently includes a graphical representation of text mining results (shows the frequency of words beginning from the most frequent to the least frequent) what I need is a hierarchical structure of these words. (words with the highest should be at the top, the frequency should decrease as u go down the hierarchical structure) all words are already represented as nodes. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, and all source code should be in java ## Platform should be compatible with windows 2000 and XP