New to Java

I have a technical java interview coming up and dont really know what to expect so I looked at some example questions and am wandering if someone can clarify the following answers.

1. How is data stored?

I dont really know what this means, does this mean using a hardrive, or maybe using primitives and objects?

2. Can you call the garbage collector?

no

3. Can you get memory leaks in java?

I dont think so/not sure

4. When would you use reflections

5. What are generics

Is generics really just like using templates in C++?

6. Can you call a C++ program from java?

No

Thanks

Calypso