How to teach yourself programming?

Hey everyone. First time posting here. I am after pursuing a career in programming and I want to start by learning Java.
What do you reckon it's the best way to go, considering I'm still 2 years away from Uni. Books, tutos, online stuff?
I also want to learn PHP, C++ and MySQL in the future.
Thank you all very much.

>>2
OP here. Thanks for the Codeacademy hint! I it's exactly what I was looking for! Hopefully it will give me a grip of how to learn the next ones!