Make a jframe appear only at the first start

Question

I have a program and I need to show a windows only at the first start of the application. What I should do? I make two classes or two JFrames in one class?

Answer 1

I think your goal is a multiple document interface .

• If the application is started a JFrame is opened with a new "document".
• If the application is started a second time the first JFrame appears instead.

Other scenarios:

• If a document is opened in the operating system, the application starts with that document (JDesktopWindow?) in a JFrame.
• If a second document is opened in the operating system, the first application opens the second document (in a new JDesktopWindow) in the same JFrame.

To implement this behaviour I used java RMI (remote method invocation).

• The application when running the first time listens on its chosen port as server.
• On start it tries as client to find a server (older instance of the application). If found it passes its command line arguments to an open call, and then quits.
• (Otherwise it starts the server and opens.)

Answer 2

import javax.swing.*;
   public class aaaaa {

   public static void main(String[] args) {
      new JFrame().setVisible(true);
   }

}

at the first you mean like this??