This looks an awful lot like a homework question. We try very hard to not hand out answer, but help you figure out the answer on your own. So, what has your own research uncovered? What exactly do you mean by "pointer concept"? Do you mean 'a variable that refers to something else'? Are you talking about pointer arithmetic?
Your second question makes less sense. Yes, Java is an OOP language - but what does that have to do with pointers? C has them and is definitely NOT OOP. I'm sure there are other languages that don't have them that are OO
There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors