JTabbedPane, and JPanel.

Question

Hi im going thrue swing tutorials here on sun. And wonder a bit about hierarchy. I use JTabbedPane and every class have there own JPanel that i add to the extended JPanel. I show below with example.
In Main class
  public JFrame mstFrame() {
        JFrame frame = new JFrame("Main Frame");
        JTabbedPane mstPane = new JTabbedPane();
        mstPane.addTab("Start", new StartPage());
        frame.add(mstPane);
        frame.setVisible(true);
        return frame;
    }In StartPage Class
public class StartPage extends JPanel {
    JPanel createProjectPanel = new JPanel(new GridBagLayout());
     GridBagConstraints c = new GridBagConstraints();
     JScrollPane createCustomerPane = new JScrollPane();
     c.gridy = 1; // second row
     c.gridx = 0; // first cell
     createProjectPanel.add(createCustomerPane ,c);
add(createProjectPanel);Does this destory the hierarchy, or is it okey to do it this way?

Answer 1

It makes sense to have each tab represented by a panel, so I don't reallly understand the question.
public class StartPage extends JPanel
    JPanel createProjectPanel = new JPanel(new GridBagLayout());
    add( createProjectPanel );However, it is unecessary to create a second panel since your class already extends JPanel. Just add the scrollPane directly to the class.
setLayout( new GridBagLayout() ):
JScrollPane createCustomerPane = new JScrollPane();
add(createCustomerPane, c);