JavaFX - Object with Constructor - constructor

Question

I'm working with JavaFX and my Idea was to have my own JavaFX Object which I can create like this:
public class Main {
public static void main(String[] args) throws Exception
TSS t = new TSS();
}
}
My JavaFX Main class looks like this:
public class TSS extends Application {
private Scene scene;
private Stage stage;
public void redrawGui() throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("tss.fxml"));
scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
#Override
public void start(Stage stage) throws Exception {
this.stage = stage;
this.stage = new Stage();
Parent root = FXMLLoader.load(getClass().getResource("tss.fxml"));
scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Normally the main method in TSS is called and its working but I want to create my own TSS-Object in its constructor, it creates the Gui.
Does anyone know how to do this?

Answer 1

In JavaFX, you should (typically) think of the Application subclass as the "main" class (i.e. the application entry point) and its start(...) method as the replacement for the main(...) method in a "traditional" Java Application.
If you want to factor your code out into a class that is separate from the Application subclass (which is generally a good idea), then you can do so, but you need to just reorganize things a little:
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws Exception {
TSS t = new TSS();
Scene scene = new Scene(t.getView());
primaryStage.setScene(scene);
primaryStage.show();
}
// not really needed in Java 8, but some IDEs need this to execute this class:
public static void main(String[] args) { launch(args);}
}
And then you can define your own class as follows:
public class TSS {
private Parent view ;
private TssController controller ; // controller class specified in FXML
public TSS() throws Exception {
load();
}
private void load() throws Exception {
FXMLLoader loader = new FXMLLoader(getClass().getResource("tss.fxml"));
view = loader.load();
controller = loader.getController();
}
public Parent getView() {
return view ;
}
public void restartGui() throws Exception {
Scene scene = view.getScene();
Stage stage = null ;
if (scene != null) {
Window window = scene.getWindow();
if (window instanceof Stage) {
stage = (Stage) window ;
}
}
load();
if (stage != null) {
stage.setScene(new Scene(view));
}
}
public void doOtherStuff() {
controller.doSomething();
}
}
You could also consider implementing the TSS class above using the custom control pattern described in the FXML documentation. I marginally prefer the style I showed here, as it favors composition over inheritance, but it is a minimal difference.