What is the best infrastructure of an application?

Question

Hello everyone,
I am a new Java learner, I don't think I'm qualified as a Java programmer so far. I try to develop a desktop application with Java, but really don't know which way to go. Could you help me please?
I have thought of two initial classes, Application and User. Should I create an instance of the Application class before adding User instance to it? Or, create an User instance and perform access control before starting the application? Any suggestion else?
Thanks very much.

Answer 1

Actually I know the requirement and workflow. I just want to know if there is a better way to start an application. Perhaps, let me ask in another way.
I've been using MicrosXXt visual series products in software development. That's easier, just create global variables to store the eg, user id, show a login screen, and show the main menu screen for a valid user etc. However, using Java seems to be another story. Should I write:
public class Application {
   private User user = null;
   public Application() {
      if (setUser(""))
         new Mainmenu().show();
   public boolean setUser( String userId) {
      if (userId.compareTo("")==0)
         new LoginScreen().show();
      // do some access control here.
   public static void main(String[] arg) {
      Application app = new Application();
}or
public class Application {
   private User currentUser = null;
   public Application(User user) {
      currentUser = user;
      new MainMenu().show();
   public static void main( String[] arg) {
      Application app = null;
      User user = new User();
      new LoginScreen( user).show();
      // let the LoginScreen do the access control work and change the value of user.
      if (!(user==null))
         app = new Application( user);
}I think there may be a lot of better ways to start an application. Any suggestion? Thanks.