Question

I have a JFrame and a Jpanel over that in which various buttons are placed.so on click of a button I have called a new class which is also having containers placed in a Jpanel.so I want to show that new class panel over the main Jframe panel.How can I do that?

And if we use card layout in it then how can i use that as on click button i have called an object of a new class.
as

Card layout consider each component in a container as card and i want whole Jpanel as a card so is it possible to do that???

Can We do nesting of Jpanels in it?

Please suggest me a right way to do that?

here is SSCCE:

// this is the  main class on which i want to use panel of other class
public class mymain 
{
    JFrame jframe =  new JFrame();
    JPanel panel = new JPanel();
    BorderLayout borderlayout = new BorderLayout();

public mymain()
{
    jframe.setLayout(borderlayout);
    JMenuBar menubar = new JMenuBar();
    jframe.setJMenuBar(menubar);

    JButton home_button = new JButton("HOME");
    menubar.add(home_button);
    jframe.getContentPane().add(panel,BorderLayout.CENTER);             
    panel.setLayout(new GridBagLayout());

    //here used containers over that frame              
             and call it from main()

}

here is another class to manage category is 

public class manageCategory 
{
JPanel panel = new JPanel();
GridBagLayout gridbglayout = new GridBagLayout();
GridBagConstraints gridbgconstraint = new GridBagConstraints();
public manageCategory()
{
            panel.setLayout(new BorderLayout());
    // i have again here used containers placed with grid bag layout
}

}

So now i want that as i click on home button used in mymain class then the panel that is used in manageCategory() should be displayed on the same panel.and when i again click on home button then the mymain panel get displayed.how can i do that???

Answer 1

I would advise you to use a CardLayout for this task.

---

Updated example with JPanel and “classes”:

static class MainPanel extends JPanel {
    public MainPanel(final Container frame) {
        add(new JButton(new AbstractAction("Click to view next") {
            @Override
            public void actionPerformed(ActionEvent e) {
                frame.add(new NextPanel(), "NextPanel");
                ((CardLayout) frame.getLayout()).show(frame, "NextPanel");
            }
        }));
    }
}

static class NextPanel extends JPanel {
    public NextPanel() {
        add(new JLabel("Next page in the card layout"));
    }
}

public static void main(String[] args) throws Exception {
    JFrame frame = new JFrame("Test");
    frame.setLayout(new CardLayout());
    frame.add(new MainPanel(frame.getContentPane()), "MainPanel");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 300);
    frame.setVisible(true);
}