JavaFX Timeline create slide show animation

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {

   StackPane slideShow = new StackPane();
   TextArea[] slides;//from   w  w  w  . ja v  a 2s . co  m

   int numberOfSlides;
   int currentSlide;

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

      slides = getPictureFiles();
      numberOfSlides = slides.length;

      Timeline timeline = new Timeline(new KeyFrame(Duration.seconds(2), e -> nextSlide()));

      timeline.setCycleCount(Timeline.INDEFINITE);
      timeline.play();

      slideShow.setOnMouseClicked(e -> {
         if (timeline.getStatus() == Animation.Status.RUNNING) {
            timeline.pause();
         } else {
            timeline.play();
         }
      });

      slideShow.getChildren().add(slides[currentSlide++]);
      Scene scene = new Scene(slideShow);
      primaryStage.setTitle("Slide Show");
      primaryStage.setScene(scene);
      primaryStage.show();
   }

   public TextArea[] getPictureFiles() {
      TextArea[] tfStrings = new TextArea[10];

      for (int i = 0; i < tfStrings.length; i++) {
         Scanner input = null;
         String s = "";
         try {
            input = new Scanner(new File("src/Text Files/slide" + i + ".txt"));
            while (input.hasNext()) {
               s += input.nextLine() + "\n";
            }
            tfStrings[i] = new TextArea(s);
            tfStrings[i].setWrapText(true);

         } catch (FileNotFoundException e) {
            e.printStackTrace();
         }
      }
      return tfStrings;
   }

   private void nextSlide() {
      slideShow.getChildren().clear();
      slideShow.getChildren().add(slides[(currentSlide++) % slides.length]);
   }

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