To be honest, if you knew C++ well enough, you probably wouldn't be considering learning Java.

Anyways:
Try tutorialspoint and the java documentation. A good book and youtube tutorials will do you well.

Its very recommended at my university to learn both, I know they are massively similair but thanks. I have a very complete understanding of c++

They're not massively similar. They're very different, actually.

I can guarantee you don't have a complete understand of C++ at all.

Really just asked a question man idk what your problem is, guess im getting paid at my internship for my lack of knowledge

I don't have a problem.

Could you talk me through rvalues and lvalues, rvalue references, universal references, move semantics, perfect forwarding, the fundamental difference between std::unique_ptr and std::shared_ptr. Also, why should I use alias declarations over typdef and use decltype. Also, what's the preferred casting method? std::reinterpet_cast or std::static_cast. What's the point in brace initialization, and why I should prefer to use nullptr over 0 or null.

Those are elementary questions that tend to expose the majority of people I meet on here you claim to be experts at C++.

Yeah, if you know C++, you should pretty much know a small bit of Java. You just need to get used to the different class syntax, the lack of pointers, the verbose standard library, the lack of deconstructors, (until recently) no unsigned integer facilities, lambda expressions differences, the different threading api etc.

I know of most of those things and I do not claim to be an expert. I already know enough for my degree and am only interested in building my resume. Why you are trying to "expose" me when i just wanted a couple links to java sites i will never understand. If you have any informatiom that is actually helpful to the question I asked ill be more than happy to read it. Thank you

No, the point is:
You did claim to be a C++ expert.
If you were an expert at C++, I think you'd be capable of using Google.

The sheer fact you posted a thread about this shows your unwillingness to take on challenges yourself. There's literally hundreds of thousands of resources out there for you to search for, very easily.

Good luck with your internship.

I found a few sites, people have interesting suggestions for sites that may not be as popular on here.