Is it normal to put all Java Swing GUIs in one class?

I just started swing development and had problems Is it normal to put the whole GUI into a single class? The application I'm building has a JFrame that displays multiple different "pages" For example, if a user clicks a button, they will be taken to a completely different page with a different layout I have configured the card layout, and the card I have built so far uses the gridbag layout

Well, my question is 1 Should each page have its own class? 2. How do they communicate between the GUI controller running the card layout and the pages? 3. Or I should put all GUIs into the GUI controller and let it run like that

Here's my code so far. I'm a novice and really want to be good at it, so if you find any major problems I missed, please point them out at any time

Code for a single page:

public class HomePage extends JPanel implements ActionListener{
    private GridBagLayout gl;
    private JPanel frm;
    JButton newPersonalContact;
    HomePage(){
         frm=new JPanel();
         gl=new GridBagLayout();
         GridBagConstraints gbc=new GridBagConstraints();
         frm.setLayout(gl);

         newPersonalContact=new JButton("New Personal Contact");
         JButton newBusinessContact=new JButton("New Business Contact");
         JButton showAllContacts=new JButton("Show All Contacts");
         JButton saveAndQuit=new JButton("Save and Quit");

         JPanel top=new JPanel();
         top.setBackground(new Color(218,165,32));
         top.add(new JLabel("Western Governers University Presents:"));


         JPanel middle=new JPanel();
         middle.setBackground(new Color(43,37,85));
         GridLayout ge=new GridLayout(4,4);
         middle.setLayout(ge);

         middle.add(new JLabel(""));
         middle.add(new JLabel(""));
         middle.add(new JLabel(""));
         middle.add(new JLabel(""));
         middle.add(new JLabel(""));
         middle.add(newPersonalContact);


         middle.add(newBusinessContact);
         middle.add(new JLabel(""));
         middle.add(new JLabel(""));
         middle.add(showAllContacts);

         middle.add(saveAndQuit);
         middle.add(new JLabel(""));middle.add(new JLabel(""));
         middle.add(new  JLabel(""));
         middle.add(new JLabel(""));

         JPanel bottom=new JPanel();
         bottom.setBackground(new Color(218,32));

         gbc.fill=GridBagConstraints.BOTH;
         gbc.weightx=1.0;

         gbc.weighty=2.0;
         gbc.gridx=0;
         gbc.gridy=0;
         frm.add(top,gbc);

         gbc.weighty=6.0;
         gbc.gridx=0;
         gbc.gridy=1;
         frm.add(middle,gbc);

         gbc.weighty=1.0;
         gbc.gridx=0;
         gbc.gridy=2;
         frm.add(bottom,gbc);

         newPersonalContact.addActionListener(this);
         newBusinessContact.addActionListener(this);
         showAllContacts.addActionListener(this);
         saveAndQuit.addActionListener(this);


}
    public void actionPerformed(ActionEvent ae){
    if (ae.getSource()==newPersonalContact){
        //What goes here?
    }

}
public JPanel getFrame(){
    return frm;
}

}

GUI controller code:

public class GUIController {
    JFrame frm;
    cardlayout cl;
    Container pane;
GUIController(){
frm=new JFrame();
frm.setSize(800,600);
frm.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);

JPanel card2=new JPanel();
card2.setBackground(Color.black);

JPanel cards=new JPanel(new cardlayout());
cards.add(new HomePage().getFrame(),"Home");
cards.add(card2,"New Personal Contact");
pane=frm.getContentPane();
pane.add(cards,BorderLayout.CENTER);





}
public void start(){
    this.frm.setVisible(true);

}
public void showCard(){
    cl.show(pane,"Card2");
}


}

Although this is for the school project, the GUI interface is not just the learning content I am interested in Thanks for your help.

Solution

No, I don't recommend putting all GUI code in class - at least if it gets big and does a few things

In this case, use mediator mode:

>Place the subcomponents in the self defined subclass of JPanel > this subclass listens to the events of its child nodes and updates other child nodes > if necessary, you can trigger custom events

Also note: if you want to learn GUI programming and do not have specific requirements for using swing, consider using the newer GUI toolkit JavaFX