The parent of the MarginalTaxMain is Application. This an example of inheritance.

package edu.citytech.cst$.$client.sample.marginaltax;

import javafx.application.Application;

import javafx.fxml$.$FXMLLoader;

import javafx.scene.Parent;

import javafx.scene.Scene;

import javafx.stage.Stage;

public class MarginalTaxMain extends Application $\{$

public static void main$($String$[]$ args$)\{$ Application.launch$($args$)$; $\}$

@override

public void start$($Stage stage$)$ throws Exception $\{$

String fileName $="/$fxml$/$MarginalTaxView$.$fxml$"$;

Parent root $=$ FXMLLoader. fileName