Ranking and sorting on Array/List
Your biggest problem is that you are using static for everything.  Change all of the static variables to instance variables, and all of the static methods (apart from main) into instance methods.  Then have your main method create an instance of JournalAnalyzer and call the (now instance) methods on that instance.

That will make the code more testable.  Another thing you need to do to improve testability is to make the methods you want to test public.