What do you guys use to learn Java?
I mean Codecademy is alright, but I feel like it doesn't completely teach you everything, just very basic things.

Read a book and do the exercises. And I don't think codeacademy even teaches java.

If you want to learn online, I recommend Stanford's introduction to computer science course. http://see.stanford.edu/see/courseinfo.aspx?coll=824a47e1-135f-4508-a5aa-866adcae1111

You can watch all the lectures, do assignments, and even practice exams for free.

hmmm.. Ill definitely check it out. thanks brother!

Imho all you need to start is the basics, youll get to know the rest by practicing and looking at others code

Don't be afraid to take every day tasks and create them in your own program.

Some simple and common examples:
Calculator
ATM Machine

Just get creative. Create something to track your inventory or character stats in a game you play. Maybe start off by having to manually put it in then move onto calling in the information if they have an API.