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Yup, in that forum already have the tutorial. So, it solved. Thanks for your responses!

--- Update ---

Hey greg! This is the code from my previous project, hope you can help me...

This is for my school project. My instructor told me to make game from java but based on GUI. And I thought about it, I want to make Tic Tac Toe (X-O) game.
Any one in here can guide me to complete...