[whatever]

Welcome.

You probably shouldn't waste your time learning Java if you're interested in hacking unless you're learning it for a class or game creation.
Also, why discontinue Python? You won't find a better scripting language for creating exploits and stuff related. C++ isn't a great choice either for things that pertain to hacking, but you could be learning out of interest to learn how to program. I'm just assuming you're learning them to advance your skills in hacking.

Something else I'd recommend is learning Assembly. You won't be skillful in actual computer/kernel exploitation until you learn it.