RevalidateExample.java Source code

Introduction

Here is the source code for RevalidateExample.java

Source

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;

public class RevalidateExample extends JFrame {

    public RevalidateExample() {
        super("Revalidation Demo");
        setSize(300, 150);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        Font font = new Font("Dialog", Font.PLAIN, 10);
        final JButton b = new JButton("Add");
        b.setFont(font);

        Container c = getContentPane();
        c.setLayout(new FlowLayout());
        c.add(b);

        b.addActionListener(new ActionListener() {
            // Increase the size of the button's font each time it's clicked

            int size = 20;

            public void actionPerformed(ActionEvent ev) {
                b.setFont(new Font("Dialog", Font.PLAIN, ++size));
                b.revalidate(); // invalidates the button & validates its root pane
            }
        });
    }

    public static void main(String[] args) {
        RevalidateExample re = new RevalidateExample();
        re.setVisible(true);
    }
}