スライドバーコンポーネントで画像を切り替える【JavaFX】

package com.example.test;

import javafx.application.Application;
import javafx.geometry.Orientation;
import javafx.scene.Scene;
import javafx.scene.control.Slider;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;

public class ApplicationTest extends Application {
    private ImageView imageView;

    @Override
    public void start(Stage primaryStage) throws Exception {
        int numImages = 61;
        Image[] images = new Image[numImages];
        for (int i = 0; i <images.length ; i++) {
            System.out.println(i + ".tif");
            images[i] = new Image(getClass().getResourceAsStream( "ex"+i+".tif"));
        }
        //Init image
        imageView = new ImageView(images[0]);

        // Initialize a listener
        Slider slider = new Slider(0, numImages-1, 20);
        slider.setOrientation(Orientation.HORIZONTAL);
        slider.valueProperty().addListener((observable, oldValue, newValue) -> {
            imageView.setImage(images[newValue.intValue()]);
        });

        //Place the component
        StackPane root = new StackPane();
        root.getChildren().addAll(imageView, slider);

        // Build scene
        Scene scene = new Scene(root, 400, 400);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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