How to call functions on the stage in JavaFX's controller file

Question

I am using javafx along with fxml, so I use the controller for the real coding. I need to do a few operations on the stage, such as getting

Answer 1

From your root Pane in the fxml file :

@FXML
Parent root

You can get the stage from it by:

Stage stage = (Stage) root.getScene().getWindow()

You have a reference to your stage, you can do what you want.