CODEWITHSUNDEEP
javajavafx
Mr. Clear
Mr. Clear

Reputation: 652

Create JavaFX8 stage and pass objects to it

I have a programm with an optional gui, coltrolled by command line args. The programm has a database connection which is needed in both parts, gui and non-gui part.

So how can I create the connection, then create a stage and give the connection to the scenen controller? Either the controller must know the main class, or the main class must know the controller.

I could do this with static variables, but this seems to be ugly.

I also could always start the programm over the start(Stage stage)-method. But then I create a stage even when I have a console only programm.

Upvotes: 0

Views: 216

Answers (1)

James_D
James_D

Reputation: 209330

It seems that the Application class forces the FX toolkit to start as soon as it is loaded. So I think you need to structure it something like this:

public class DataBaseAccessor {

    // constructor connects to database...

    // provides methods for data access ....

}

A GUI startup class:

public class MyGuiApp extends Application {

    @Override
    public void start(Stage primaryStage) {
        DataBaseAccessor dbAccessor = new DataBaseAccessor();
        // build UI etc...
        primaryStage.show();
    }

}

and a general startup class:

public class MyApp {


    public static void main(String[] args) {
        if (args.length == 1 && "-graphical".equals(args[0])) {
            Application.launch(MyGuiApp.class, args) ;
        } else {
            runWithoutUI();
        }
    }

    private static void runWithoutUI() {
        DataBaseAccessor dbAccessor = new DataBaseAccessor();
        // run without UI....
    }

}

Now you can do 

java MyApp

to run without the UI, and 

java MyApp -graphical

to run with it.

Upvotes: 2

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