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What happened when you tried? ;)

Notice that Hashtable *is a* Map.

The Map tutorial contains code for breaking up an array of words into the frequency of each. Might be useful: The Map Interface (The Java™ Tutorials > Collections > Interfaces)

What about it is confusing you?

I suggest writing out what you have to do, in plain English. Pretend you have a really dumb friend, and your job is to show that friend how to categorize a bunch of...

I'm not totally sure what your question is. What have you tried?