What is the best way to store and iterate over lists of words?

Hi,
Im trying to create a naive bayesian classifier to attribute aurthorship to some texts. I have three text files in the form of a list of words (listA, listB and listC, where listA is a disputed text and listB, listC are those of known authors). I need to feed these into my program, than compare listA to listB (to check if listA has the same words as listB), perform the classification and do the same for listA and listC.
Im new to java and would like to know the best way of comparing the text files....could i store listA in an array....listB in a hashmap, iterate over the hashmap to check which words are also contained in listA and store the similar words in a seperate arraylist?
plz help.

If you just want to check if one set of words contains another set of words then something implementing java.util.Set might be sufficient. Read the API docs, you don't need to write much code yourself. Maps are for looking up values based on keys; your problem statement doesn't mention that so you don't need them. Lists are for when the order of entries matters. Read this for more information:
http://java.sun.com/docs/books/tutorial/collections/index.html

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