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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);
}
}
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