To make your form work, you have to provide a runtime frame for it. The main() method for GUI forms takes care of creation and disposal of such frame.

To create a main() method for a form
  1. Open for editing the bound class of a form where you want to create the main() method.
  2. Press ⌘N⌃N⌘N^ N⌥ Insert.
  3. On the pop-up menu, click Form main(). The following method is added to the source code: 
    public static void main(String[] args) {
rame = new JFrame("<class name>");
tContentPane(new <class name>().contentPane);
tDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ck();
tVisible(true);

See Also

Procedures: