Honestly the only insane thing is that it's all in one file. Could've also been broken up into more functions (it seems like this person didn't actually want to be using Java), but it's reasonably named and formatted and they did a decent job separating out static data at the top instead of littering it throughout the code.
Oh, and that stream of comments by polytomous. That's... something.
Oh, and that stream of comments by polytomous. That's... something.