How to stop size of JTextField from changing when I change font to bold

Question

I'm working on a Sudoku solver for a CS project. I've got JTextFields for the input. I want to bold the entries of the begining puzzle, like they are in the magazines. When I set the font to bold, it changes the size of the text field. I'm using the gridbaglayout and have tried everything to set in stone the size of a text field, but nothing seems to work. I've set the maximum, minimum size, the setSize method, as well as setting the prefered size. But no matter, when I change the font from plain to bold, the box grows in size. How do I prevent this from happening. I can post my gui code if it would help.
Here is a link to my grid, with the upper left square having bold text:
http://12.227.129.113/CS486/Project4/Project4.html

Answer 1

add them to panel/s set as a gridlayout 9 x 9, or (3 x 3) x (3 x 3)
simple demo of a 9 x 9
import java.awt.*;
import javax.swing.*;
class Testing extends JFrame
  JTextField[] tf = new JTextField[81];
  public Testing()
    setLocation(200,100);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    JPanel p = new JPanel(new GridLayout(9,9,5,5));
    for(int x = 0, y = tf.length; x < y; x++)
      tf[x] = new JTextField(2);
      tf[x].setHorizontalAlignment(JTextField.CENTER);
      p.add(tf[x]);
    tf[0].setFont(tf[0].getFont().deriveFont(Font.BOLD));
    tf[0].setText("9");
    tf[1].setText("3");
    tf[66].setFont(tf[66].getFont().deriveFont(Font.BOLD));
    tf[66].setText("9");
    getContentPane().add(p);
    pack();
  public static void main(String[] args){new Testing().setVisible(true);}
}