Store dynamic screen with multiple stages

Question

I´ve got 2 different screens, in the first screen the user can load images and the other one is just a single button (the stage is invisible so the stage has to be different

Answer 1

if the primaryStage is where "user can load images" do :

static Stage primaryStage;

@FXML
private void goToScreen1(ActionEvent event) throws Exception{


    Stage stage = (Stage) showStage.getScene().getWindow();
    FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/sample.fxml"));
    Parent root = fxmlLoader.load();

    if(primaryStage==null)
    primaryStage = new Stage();

    primaryStage.setResizable(true);
    primaryStage.setOpacity(0.0);
    primaryStage.show();

    primaryStage.setX(0);
    primaryStage.setY(0);
    primaryStage.setHeight(primScreenBounds.getHeight());
    primaryStage.setWidth(primScreenBounds.getWidth() / 2);

}