How to change JButton font dynamically in Java?

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: