New to Java

hello,
I'm trying to make a game it is my first game called "Gomoku", I need to know how to start to develop simple board games in java with using another class which called Square. it represents one square of the board. contains simple attributes x,y for the position and occupied variable to check if the sequare is occupied by the circle or not. And I should draw the board using JPanel.

is there any simple example for that? I can't figure out how to draw a grid of 10x10 2d array by using Square class and paintComponent in JPanel. I'm a beginner in learning about graphics in java but I want to start understanding games and implement them.

Thanks