problem add panel to other panel

[Nouf Nassri]

Hello everyone


I have a big problem I have a window that extends Jframe fenetere
contains two panels panel1 contains 2 buttons and panel2 is empty and I have two other panel extends JPanel panel3 panel4 and I like when I click button 1 i want to add 3 to the panel panel2 empty and when I click the button2 I want to add a panel4 panel2 and disappear the panel3 knowing that I work on netbeans:

button 1:

  panel2.setLayout(null);
        panel2.setLayout(new GridLayout());
        panel.setPreferredSize(new Dimension(700, 600));
       panel2.add(new panel3());
  

button 2:

  panel2.setLayout(null);
        panel2.setLayout(new GridLayout());
        panel.setPreferredSize(new Dimension(700, 600));
       panel2.add(new panel4());
  

but I do not know where is the problem.

Thank you for the help.

[Maneesh Godbole]

You need to call revalidate() and repaint() on the parent when you add/remove a child.
If your intention is to display only one panel at one time, but switch panels, the check out CardLayout

[Nouf Nassri]

Thank you for your reply I did that

   

panel2.setLayout(null);
        panel2.revalidate();
    panel2.repaint();
        panel2.setLayout(new GridLayout());
        panel.setPreferredSize(new Dimension(700, 600));
       panel2.add(new panel3());


 

but whenever I click a button I see another side of panel panel2

[Maneesh Godbole]

revalidate() and repaint() should be called after you add the panel3

[Nouf Nassri]

Maneesh Godbole wrote:revalidate() and repaint() should be called after you add the panel3

Thank you very much got the same problem

   

panel2.setLayout(null);  

   panel2.setLayout(new GridLayout());  
       panel.setPreferredSize(new Dimension(700, 600));  
      panel2.add(new panel3());
       panel2.revalidate();  
 panel2.repaint();  
 

[Maneesh Godbole]

Post your SSCCE which we can try out in our environment.
With the code you have posted, it is difficult to figure out what is going wrong.