How to repaint/refresh/redraw JPanel

[Nageswar Kakolla]

Hi there,

To catch immediate attention, I have started New post

I want to redraw the JPanel (not graphics way)


my scenario is
I have two JButtons(jb1,jb2) and I am remove these two buttons and added new set of two buttons(jb3,jb4) upon Save action and I want to redisplay the JPanel with buttons(jb3,jb4)

please give me code specific and no theory please

Appreciate immediate help

..medival Man

[Jeff Albertson]

It may be simpler to toggle the button's visibility:

import java.awt.event.*;
import javax.swing.*;
 
public class Test extends JPanel {
private JButton[] buttons = { new JButton("0"), new JButton("1"),
new JButton("2"), new JButton("3"), new JButton("4"),};
private ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
for(int i=0; i<buttons.length; ++i)
buttons[i].setVisible(!buttons[i].isVisible());
}
};
 
public Test() {
for(int i=0; i<buttons.length; ++i) {
buttons[i].addActionListener(al); //for demo
add(buttons[i]).setVisible(i%2==0);
}
}
 
public static void main(String[] args) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(new Test());
f.pack();
f.setLocationRelativeTo(null);
        f.setVisible(true);
}
}

[ February 02, 2006: Message edited by: Jeff Albertson ]

[Nageswar Kakolla]

First Of all, Thanx for immediate reply.
But, I need to place the buttons at same location. It seems given code sample will hide set of two buttons any time .

in laymans terms,

chang the name of Buttons name at the same position & location

-- appreciate help
here is code i am using where m_buttonPanel is JPanel and
m_previousButton -> Previous Button
m_nextButton -> Next Button,
m_cancelButton -> CancelButton
m_saveButton -> Save Button

and following code is action Handler

m_buttonPanel.remove(m_previousButton);
m_buttonPanel.remove(m_nextButton);
m_buttonPanel.add(m_cancelButton);
m_buttonPanel.add(m_saveButton);
m_buttonPanel.repaint();


but repaint is not reloading the Jpanel but if change the focus of Screen and come back then it is displaying correctly

[Nageswar Kakolla]

i got it.

revalidate() will reload the components and visible