Re: How Do I get Notified when the JFrame Gets Resized?

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <>
Sat, 20 Nov 2010 13:41:05 -0500
On 20-11-2010 12:58, KevinSimonson wrote:

What do I have to do to be notified when the JFrame my JPanel is in
gets resized? Like if somebody clicks on the corner and drags it so
that I have a new width and new height, or if somebody clicks on the
button that makes the JFrame take up the whole screen?

Try look at this code:

import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;

public class ResizeCatcher extends JFrame implements ComponentListener {
     public ResizeCatcher() {
         setSize(200, 200);
     public static void main(String[] args) {
         SwingUtilities.invokeLater(new Runnable() {
             public void run() {
                 JFrame f = new ResizeCatcher();
     public void componentResized(ComponentEvent e) {
         if(!e.paramString().equals("COMPONENT_RESIZED (0,0 200x200)")) {
             JOptionPane.showMessageDialog(this, "My size is perfect
thank you");
             setSize(200, 200);
     public void componentMoved(ComponentEvent e) {
     public void componentShown(ComponentEvent e) {
     public void componentHidden(ComponentEvent e) {


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