小编Hif*_*ech的帖子

        btnRegister.setOnAction(e ->{// register button method
            try {
            Stage stage = new Stage();
            FXMLLoader loader = new FXMLLoader();
            Pane root =         loader.load(getClass().getResource("Register.fxml").openStream());
            RegisterController Msg = loader.getController();
            Scene scene = new Scene(root);
            scene.getStylesheets().setAll(
                getClass().getResource("style.css").toExternalForm()
            );
            stage.setScene(scene);
            stage.show();
            ((Node) e.getSource()).getScene().getWindow().hide();

            } catch (Exception ex) {
                System.out.println(ex);
            }
        });