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I just had a thought. If your phrases array has a length of 10 and you only add 3 phrases to it then the other 7 slots will be null. However your loop iterates over the entire array and you try and...

On line 32 something is null. Time for you to debug your code. Add a print statement(s) before that line and print out all the variables to find out which is null. Then work out why it is null.

You haven't tried very hard. I posted the three constructors the StringTokenizer class has. You are trying to call the String array, String constructor which does not exist.

Oh come on. What is the first parameter you are passing to the StringTokenizer constructor?

Parameters to constructors and methods must match in number, type and order. StringTokenizer has 3 constructors:
String
String, String
String, String, boolean

Are you using any of those...