Design question regarding JTabbedPane

[Ashish Gupta]

Hello All,
I have a design question regarding JTabbedPane. I have JTabbedPane with three tabs. When I launch my application, objects in both tab 2 and 3 are created and other operations done. As I continue to add more tabs and make each tab more feature rich, it takes more time for application to launch. Is there a way to restrict object creation/other operations in tab 2 and 3 to be invoked only when user click on them? I am not sure how to handel this design. Code I am using is as below.

public class Organizer extends JFrame{
private JTabbedPane tabbedPane;
public Organizer () {
// create the outer most frame
super("Organizer");
   try {
// create the tabbed pane
addWindowListener (new WindowAdapter() {
public void windowClosing(Event e) {
dispose();
System.exit(0);
}
});

tabbedPane = new JTabbedPane(SwingConstants.TOP);
// add panes to tabbed pane
populateTabbedPane();

// add tabbed pane to the frame
getContentPane().add(tabbedPane);
pack();
} // end of constructor

/**
 * Add tabs in the Tabbed Pane.
 */
private void populateTabbedPane() {  
        tabbedPane.addTab("Welcome",null,new Welcome(),"Welcome");
        tabbedPane.addTab("Tab2",null,new Tab2(),"Tab2");
        tabbedPane.addTab("Tab3",null,new Tab3(),"Tab3");
      }
public static void main(String[] args) { 
Organizer dl = new Organizer();

dl.setSize(765, 690);
dl.setVisible(true);
dl.setResizable(false);
}
}

Thanks
Ashish

[Ernest Friedman-Hill]

You can register a ChangeListener with the JTabbedPane, and it will be notified when a new tab is exposed. This would give you a chance to set that tab up the first time the tab is used.