The following is an example to change JButton font dynamically:
Example
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class SwingDemo extends JFrame {
JButton button = new JButton("Change");
int fontSize = 10;
public SwingDemo() {
setSize(500, 400);
setDefaultCloseOperation(EXIT_ON_CLOSE);
add(button);
// changing font size dynamically on button click
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
button.setFont(new Font("Dialog", Font.PLAIN, ++fontSize));
button.revalidate();
}
});
setVisible(true);
}
public static void main(String[] args) {
new SwingDemo();
}
}
Output
Click “Change” button above to change the font: