Code to create a grid of clickable panels in SWING

GridPane.java

    public static class GridPane extends JPanel {

        public GridPane(int row, int col) {

            int count = 0 ; // use to give a name to each box so that you can refer to them later
            setLayout(new GridLayout(row, col));
            setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));

            for (int i = 1; i <= (row * col); i++) {
                JPanel pan = new JPanel();

                pan.setEnabled(true);
                pan.setBackground(Color.WHITE);
                pan.setPreferredSize(new Dimension(3, 3));
                pan.setBorder(BorderFactory.createLineBorder(Color.BLACK));
                pan.addMouseListener(new BoxListener()); // add a mouse listener to make the panels clickable
                pan.setName(count+"");
                ++count;
                add(pan);
            }
        }
    }
    
    //Class that defines what happens (i.e: the color changes) when a panel is clicked
    public static class BoxListener extends MouseAdapter
    {
    	public void mouseClicked(MouseEvent me)
    	{
              JPanel clickedBox =(JPanel)me.getSource(); // get the reference to the box that was clicked 

              // insert here the code defining what happens when a grid is clicked
        }
    }