Launch JavaFX application from another class

Question

I need to start a javafx Application from another "container" class and call functions on the Application, but there doesn't seem to be any way of getting hold of a reference to the Application started using the Application.launch() method. Is this possible? Thanks

Answer 1

Suppose this is our JavaFX class:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;

public class OKButton extends Application {

    @Override
    public void start(Stage stage) {
        Button btn = new Button("OK");
        Scene scene = new Scene(btn, 200, 250);
        stage.setTitle("OK");
        stage.setScene(scene);
        stage.show();
    }
}

Then we may launch it from another class like this:

import javafx.application.Application;

public class Main {
    public static void main(String[] args) {
        Application.launch(OKButton.class, args);
    }
}