Hi

I am trying to code a Sudoku grid where people can write candidates
(possible values) at the top of each cell. I have done this by each
cell using a border layout where the:
- north area is a JTextField where candidates can be entered
- the centre area is a JTextLabel where the cell value can be entered
(using a click popup menu)

Unfortunately I am struggling to make the cell values fill the entire
vertical space up to where candidates can be written - there seems to
be a margin or gap of a few pixels where the value will not be written
into. Similarly in the north area, there seems a margin of a few
pixels above and below where values are are written.
Is there any way I can remove these extra spaces?
Furthermore, if anyone has any better recommendations of how to lay
this out, so it can be scaled easily (e.g. the font size increases as
the grid is expanded) this would also be most helpful.

Thanks in advance
Chris

p.s
Some code which can be run to show the problem is as follows:

public class CellTest extends JPanel  {

    public CellTest() {
        setLayout(new BorderLayout());
        setBorder(BorderFactory.createLineBorder (Color.black, 1));

        Font canFont = new Font("Verdana", Font.PLAIN, 10);
        JTextField canTxtField = new JTextField("1");
        canTxtField.setFont(canFont);
        canTxtField.setBorder(null);

        add(canTxtField, BorderLayout.NORTH);

        Font cellValFont = new Font("Times new roman", Font.PLAIN, 32);
        JLabel cellValTxtLabel = new JLabel("2");

        cellValTxtLabel.setFont(cellValFont);
        cellValTxtLabel.setHorizontalAlignment(JLabel.CENTER);
        add(cellValTxtLabel, BorderLayout.CENTER);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setSize(200, 200);
        frame.getContentPane().setLayout(new GridLayout(3, 3, 0, 0));
        for(int i=0; i <9; i++){
            frame.add(new CellTest());
        }
        frame.setVisible(true);
    }
}