Resizing of JFrame while the font on buttons increases

Question

Hey,
I would like to ask you how to resize my JFrame ,when the size of buttons put in this frame increases.
I mean the font on the buttons increases by 1 point every time I press the button. My goal is to make the two buttons visible all the time. Therefore I need to resize my JFrame. I tried in the following method, but it did not work :(
(cp is contentPane() of my JFrame - frame)
public void actionPerformed(ActionEvent e) {
Component c = (Component) e.getSource();
Integer nazwa= c.getFont().getSize()+1;
int width = (int) cp.getPreferredSize().getWidth();
if(cp.getPreferredSize().getWidth()>cp.getWidth()) {
cp.setSize(new Dimension(width, cp.getHeight()));
cp.validate();
int height = (int) cp.getPreferredSize().getHeight();
if(cp.getPreferredSize().getHeight()>cp.getHeight()) {
cp.setSize(new Dimension(cp.getWidth(),height));
cp.validate();
c.setFont( new Font(c.getName(), c.getFont().getStyle(), nazwa));
frame.validate();
}

Answer 1

pack() does not help, as I have already used it.
Pls find below the whole code of the program:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class GUI implements ActionListener{
final int BNUM = 2;
static JFrame frame = new JFrame()
static Container cp = frame.getContentPane();
GUI() {
cp.setLayout(new BoxLayout(cp, BoxLayout.X_AXIS));     
for (int i = 1; i <= BNUM; i++) {
JButton b = new JButton("Przycisk " + i);
b.addActionListener(this);
cp.add(b);
frame.pack();
frame.show();
public void actionPerformed(ActionEvent e) {
Component c = (Component) e.getSource();
Integer nazwa= c.getFont().getSize()+1;
int width = (int) Integer.parseInt(cp.getPreferredSize().getWidth().toString());
if(cp.getPreferredSize().getWidth()>cp.getWidth())
cp.setSize(new Dimension(width, cp.getHeight()));
if(cp.getPreferredSize().getHeight()>cp.getHeight()) {
cp.setSize(new Dimension(cp.getWidth(),cp.getPreferredSize().getHeight()));
cp.validate();
c.setFont( new Font(c.getName(), c.getFont().getStyle(), nazwa));
public static void main(String[] a) {
//cp.setPreferredSize(new Dimension(200,200));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
new GUI(); }
}