Need help with JFrame app

ok im trying to create basically a tic tac toe game in java. However im
having a bit of trouble with the basics, being new to java and all.
What ive done is create a class called XOPanel, that creates a array of
objects called XOSquare. XOPanel creates a window and what i want it to
do is draw a 3x3 gris on this window and fill each of these spaces with
its coresponding XOSquare. Each XOSquare is just a JPanel i want
created so that later on an X or O will be drawn to it. However right
now my window pops up, but im unsure how to get the array to draw, or
how to fill each position with its XOSquare. Heres what i ahve so far:

XOPanel:

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class XOPanel extends JPanel implements MouseListener {

    private int squareSize;
    private XOSquare[][] boardArray;
    private int width = 400, height = 400;

    public XOPanel(){
        boardArray = new XOSquare[3][3];
        setSize(width, height);
    }

    private void paintComponet(Graphics g){
        super.paintComponent(g);
        int paneHeight = this.getHeight();
        int paneWidth = this.getWidth();
        if (paneHeight < paneWidth)
          squareSize = paneHeight / 3;
        else
          squareSize = paneWidth / 3;

        for (int row=0; row<3; row++){
         for (int col=0; col<3; col++){
         g.drawRect(col*squareSize, row*squareSize, squareSize,
squareSize);
            }
        }
    }

    public static void main(String[] args){
        JFrame f = new JFrame("Test");
        XOPanel xoPanel = new XOPanel();
        f.getContentPane().add(xoPanel);
        f.setSize(xoPanel.width, xoPanel.height);
        f.setVisible(true);
        f.addWindowListener
          ( new WindowAdapter()
            { public void windowClosing(WindowEvent e)
              { System.exit(0);
              }
            }
          );

    }

XOSquare:

import java.awt.Rectangle;

public class XOSquare extends Rectangle {

    public XOSquare(int width, int height){
        this.setSize(width, height);
    }
}

im hoping you guys can help.