What I am currently trying to make are 3 panels in a frame that is laid out via GridLayout(), and each of the 3 panels would have their own panels within them that would be containing text. The top-most panel would only contain a single line (a fake email address), while the panel below it would contain the contents of an email. However, when I try setting senderPanel (the panel within the other panel), the panel size does not change and stays zero.

` private void showLastJFrame(WindowAdapter windowAdapter){
JFrame frame3 = new JFrame();
frame3.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); // We don’t want to exit the entire program when frame 2 is closed
frame3.setLayout(new GridLayout(1,3));

    frame3.setSize(1600, 900);
    frame3.addWindowListener(windowAdapter);
    frame3.setVisible(true);

    JPanel panel1 = new JPanel();
    panel1.setSize(new Dimension(frame3.getWidth()/3,900));
    JPanel panel2 = new JPanel();
    JPanel panel3 = new JPanel();

    // Set bounds and background color
    panel1.setBackground(null);

    panel2.setBackground(new Color(100,255,100));

    panel3.setBackground(new Color(100,100,255));


    String[] test = makeEmail.getEmail();
    System.out.println(test[1]);


    // Add labels to panels
    
    JPanel senderPanel = new JPanel();
    JLabel senderLabel  = new JLabel(test[1]);
    senderPanel.setBackground(Color.ORANGE);
    senderPanel.setOpaque(true);
    senderPanel.setSize(new Dimension(panel1.getWidth(),100));
    System.out.println(senderPanel.getSize());
    panel1.add(senderPanel);
   // senderPanel.add(senderLabel);
    System.out.println(panel1.getWidth()+ "" + panel1.getHeight());
  //  JPanel bodyPanel = new JPanel();
    //JLabel bodyLabel = new JLabel(test[2]);


    //bodyPanel.add(bodyLabel);
    
   // panel1.add(bodyLabel);`

I’ve already tried making a grid layout within each panel so that the subpanel (senderPanel) would appear, which worked, however I can’t readjust their size. I have also already used setSize() on panel1 (the main panel) to try and give the subpanels reference dimensions so I could fit them. Additionally I have tried using a FlowLayout() for senderPanel, but that doesn’t resize it either.