Help with Tic Tac Toe

Hey guys, i’m beginner programmer and i started to learn Java few months ago. I started to use JMonkey to build my own games like tic tac toe, that i had done in C language and in simple Java, but i need do it now in 3D and i’m using JMonkey to do it. I saw all the tutorials in the begginer area but i’m having problems to build tic tac toe. Someone could help with any project that exists or sample like that? I’m having problems to create classes, to use the object orientation. Please help me!
Thank you!

your problem isn’t with Tic Tac Toe, its with Java in general, try this first