如何在javafx fxmlcontroller中更改菜单项中的场景

<Menu>
    <items>
        <MenuItem text="切换场景" onAction="#changeScene"/>
    </items>
</Menu>

public class FXMLController {
    @FXML
    private void changeScene(ActionEvent event) {
        MenuItem menuItem = (MenuItem) event.getSource();
        Scene scene = menuItem.getScene();
        
        // 更改场景的根节点
        Parent newRoot = FXMLLoader.load(getClass().getResource("new_scene.fxml"));
        scene.setRoot(newRoot);
    }
}

<Menu>
    <items>
        <MenuItem text="切换场景" onAction="#changeScene"/>
    </items>
    <fx:controller="com.example.FXMLController"/>
</Menu>