Aplicación contador de votos y PieChart JavaFX. (necesita imágenes)

Main.java

// necesita imágenes

package tech.alvarez;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

    private int nroVotosSaltena = 0;
    private int nroVotosTucumana = 0;
    private int nroVotosLaucha = 0;

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {

        Label tituloLabel = new Label("Qué prefieres?");

        Image saltenaImage = new Image(getClass().getResourceAsStream("imagenes/saltena.jpg"));
        Image tucumanaImage = new Image(getClass().getResourceAsStream("imagenes/tucumana.jpg"));
        Image llauchaImage = new Image(getClass().getResourceAsStream("imagenes/llaucha.jpg"));

        ImageView saltenaImageView = new ImageView(saltenaImage);
        ImageView tucumanaImageView = new ImageView(tucumanaImage);
        ImageView llauchaImageView = new ImageView(llauchaImage);

        saltenaImageView.setFitHeight(80);
        saltenaImageView.setFitWidth(80);
        tucumanaImageView.setFitHeight(80);
        tucumanaImageView.setFitWidth(80);
        llauchaImageView.setFitHeight(80);
        llauchaImageView.setFitWidth(80);

        Button saltenaButton = new Button("", saltenaImageView);
        Button tucumanaButton = new Button("", tucumanaImageView);
        Button lauchaButton = new Button("", llauchaImageView);


        saltenaButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                nroVotosSaltena++;
            }
        });
        tucumanaButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                nroVotosTucumana++;
            }
        });
        lauchaButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                nroVotosLaucha++;
            }
        });
        Button finalizarButton = new Button("Finalizar");

        HBox hBox = new HBox();
        hBox.setSpacing(20);
        hBox.getChildren().add(saltenaButton);
        hBox.getChildren().add(tucumanaButton);
        hBox.getChildren().add(lauchaButton);

        VBox vBox = new VBox();
        vBox.setSpacing(20);
        vBox.setPadding(new Insets(20, 20, 20, 20));
        vBox.getChildren().add(tituloLabel);
        vBox.getChildren().add(hBox);
        vBox.getChildren().add(finalizarButton);


        finalizarButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                System.out.println("> salteña: " + nroVotosSaltena);
                System.out.println("> tucumana: " + nroVotosTucumana);
                System.out.println("> laucha: " + nroVotosLaucha);

                ObservableList<PieChart.Data> datos = FXCollections.observableArrayList(
                        new PieChart.Data("Salteña", nroVotosSaltena),
                        new PieChart.Data("Tucumana", nroVotosTucumana),
                        new PieChart.Data("Laucha", nroVotosLaucha)
                );
                PieChart grafico = new PieChart(datos);
                vBox.getChildren().add(grafico);

            }
        });


        Scene scene = new Scene(vBox, 400, 400);
        primaryStage.setScene(scene);
        primaryStage.show();


    }
}