Uses of URL & ResourceBundle in JavaFX

Question

What is the purpose of URL & ResourceBundle in the following code

public class HelloWorld implements Initializable  {

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        ...
    }
}

Answer 1

As per the documentation for the Initializable interface:

NOTE This interface has been superseded by automatic injection of location and resources properties into the controller. FXMLLoader will now automatically call any suitably annotated no-arg initialize() method defined by the controller. It is recommended that the injection approach be used whenever possible.

You should use something like this instead:

public class Controller
{
    @FXML
    private URL location;
    @FXML
    private ResourceBundle resources;

    public void initialize()
    {
      // do your setup stuff here
      // fxml loader will call this for you
    }
}

Additional note: The above quote calls for a 'suitably annotated no-arg initialize() method'. If for whatever reason you require a private initialization, make sure you 'suitably annotate' it with the @FXML annotation.