Read JavaFx Application - javafx-8

Question

I created a small javaFx Program. The Program just displays random points. Now I want to get and read the generated Stage from a different class and read the co-ordinates. Is it possible ?
I tried creating a class variable to get stage but its null always.
I added a class variable and assigned the prepared Stage object to the variable. I am then trying to get the Stage object from the variable.
public class DCGUI extends Application {
private Stage primaryStage1;
public static void main(String[] args) {
launch(args);
Platform.exit();
}
#Override
public void start(Stage primaryStage) throws Exception {
Random r = new Random(64);
// List<Integer> points = r.ints(1000, 0, 400).boxed().collect(Collectors.toList());
List<Node> cList = new ArrayList<>();
Line line = null;
Circle c = null;
for (int i = 0; i < 50001; i++) {
//System.out.println(r.nextInt());
c = new Circle(r.nextInt(400), r.nextInt(400), 0.0125);
c.setStroke(Color.RED);
c.setId(i+"");
cList.add(c);
}
Group group = new Group(cList);
Scene scene = new Scene(group, 400, 400);
primaryStage.setScene(scene);
primaryStage.setTitle("Dynamic Connectivity");
primaryStage1 = primaryStage;
primaryStage.show();
}

Answer 1

Let's assume the following code example. By calling the getMainStage() method you can have access to your Stage object.
Of course, the main.fxml file is binded with the MainController class
Main.java
public class Main extends Application{
#Override
public void start(Stage stage) throws Exception {
FXMLLoader loader = new FXMLLoader("path/to/main.fxml").toFile().toURI().toURL());
MainController.setMainStage(stage); <---- !
Parent root = loader.load();
stage.setScene(new Scene(root, 1400, 850));
stage.show();
}
public static void main(String[] args) {
launch(args);
}}
MainController.java
public class MainController{
// fxml view elements...
private static Stage mainStage;
//...
public static Stage getMainStage() {
return mainStage;
}
}