New to Java

I am working on a project in which I need to analyze the positions of children in a classroom over the course of several weeks. I'm attempting to treat the data as series generated by a Markov chain, but am getting lousy results. I suspect the problem is that my code is buggy, but I am having trouble debugging because I don't have any "control" data to work with, so to speak.

I would like to generate series of mocked-up 2-dimensional data using a Markov model with known transition probabilities. I know that I could write my own code to generate these data series, but given that I am new to java (only started learning it about a month ago, because everyone else in the lab uses java exclusively), and not terribly good at object-oriented programming on the best of days, I'd rather find a pre-existing package than burn a week or two writing one.

I've tried googling on the terms "Markov java" and "Markov chain generation java" and haven't found anything likely. Do any of you know of free software that does what I want?