MainMenu.java

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import javafx.animation.FadeTransition;
import javafx.animation.ParallelTransition;
import javafx.animation.TranslateTransition;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.KeyCode;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;


public class MainMenu extends Application  {
    private static final Font FONT = Font.font("", FontWeight.BOLD, 18);
    
    private Stage primaryStage;
    private Scene startScene;
    private Scene menuScene;
    
	private VBox menuBox;
	private VBox startBox;
	private  MenuItem startItem;
	
	protected int currItem=0;
    private Random rand = new Random();
	private int playerNum = (int) ((Math.random()*656)+44);
    private int randNumber= 0;
    
    private ScheduledExecutorService bgThread = Executors.newSingleThreadScheduledExecutor();
    private Duration durationInSeconds = Duration.seconds(0.4);
    private Duration durationInMillis=Duration.millis(1000);


	private int temPlayerNum;

    private Parent createMainMenuContent() throws FileNotFoundException {
        Pane root = new Pane();
        root.setPrefSize(900, 600);

        final Image background = new Image(readFoto("Images/snakeBG.png"));
        final ImageView background_node = new ImageView(background);
        
        ContentFrame frame1 = new ContentFrame(createLeftContent());
        ContentFrame frame2 = new ContentFrame(createRightContent());
        
        HBox mainInfoBox = new HBox(300, frame1, frame2);
        mainInfoBox.setTranslateX(100);
        mainInfoBox.setTranslateY(50);


        startItem = new MenuItem("Start");
        // Hier ist das Problem
//        startItem.setOnActivate(new Runnable() {     	
//				@Override
//				public void run() {
//					try {
//						System.out.println(createStartContent());
//						startScene= new Scene(createStartContent());
//					} catch (FileNotFoundException e) {
//						e.printStackTrace();
//					}
//					actions(startScene, startBox);
//					primaryStage.setScene(startScene);
//					primaryStage.show();
//				}
//        });
 
        MenuItem exitItem = new MenuItem("EXIT");
        exitItem.setOnActivate(() -> System.exit(0));

        menuBox = new VBox(10,
        		startItem,
                new MenuItem("Settings"),
                new MenuItem("About"),
                exitItem);
        menuBox.setAlignment(Pos.TOP_CENTER);
        menuBox.setTranslateX(360);
        menuBox.setTranslateY(300);

        getMenuItem(0).setActive(true);
        root.getChildren().addAll(background_node, mainInfoBox, menuBox);
        return root;
    }

    private Node createLeftContent() {
        final Text inbox = new Text( playerNum+ " are playing this game");
        inbox.setFill(Color.WHITE);

        bgThread.scheduleAtFixedRate(() -> {
            Platform.runLater(() -> {
            	 
                TranslateTransition tt = new TranslateTransition(durationInSeconds, inbox);
                FadeTransition ft = new FadeTransition(durationInSeconds, inbox);

                tt.setToY(100);
                ft.setToValue(0.1);

                ParallelTransition pt = new ParallelTransition(tt, ft);

                pt.setOnFinished(e -> {
                    inbox.setTranslateY(-100);
                   
                    inbox.setText(getPlayerNum()+ " are playing this game");

                    TranslateTransition tt2 = new TranslateTransition(durationInSeconds, inbox);
                    FadeTransition ft2 = new FadeTransition(durationInSeconds, inbox);

                    tt2.setToY(0);
                    ft2.setToValue(5);

                    ParallelTransition pt2 = new ParallelTransition(tt2, ft2);
                    pt2.play();
                });
                pt.play();
            });
        }, 2, 4, TimeUnit.SECONDS);

        return inbox;
    }

    private Node createRightContent() {
        String title = "!! Snake Game !! :)";
        HBox letters = new HBox();
        letters.setAlignment(Pos.CENTER);
        for (int i = 0; i < title.length(); i++) {
            Text letter = new Text(title.charAt(i) + "");
            letter.setFont(FONT);
            letter.setFill(Color.WHITE);
            letters.getChildren().add(letter);
    
            TranslateTransition tt3 = new TranslateTransition(durationInMillis, letter);
            FadeTransition ft3 = new FadeTransition(durationInMillis, letter);

            tt3.setFromY(-25);
            tt3.setToY(25);
            ft3.setFromValue(0.1);
            ft3.setToValue(1);
            
            ParallelTransition pt3 = new ParallelTransition(tt3, ft3);
            pt3.setDelay(Duration.millis(i*30));
            pt3.setAutoReverse(true);
            pt3.setCycleCount(TranslateTransition.INDEFINITE);
            pt3.play();
        }
        return letters;
    }

	public FileInputStream readFoto (String source) throws FileNotFoundException {
		return  new FileInputStream(source);
    }
	
    protected MenuItem getMenuItem(int index) {
        return (MenuItem) menuBox.getChildren().get(index);
    }
    
    private int getPlayerNum () {
   	 for( int i=0; i<1000; i++ )         
        {     
          randNumber = rand.nextInt(15) + 5;
        }
        temPlayerNum=playerNum + randNumber;
        playerNum= temPlayerNum;
        return playerNum;
   }
    

    @Override
    public void start(Stage primaryStage) throws FileNotFoundException{
    	menuScene = new Scene (createMainMenuContent());
        actions(menuScene, menuBox);
        primaryStage.setScene(menuScene);
        primaryStage.show();
    }
    
    public void actions(Scene scene, VBox box) {
    	scene.setOnKeyPressed(event -> {
            if (event.getCode() == KeyCode.UP) {
                if (currItem > 0) {
                    getMenuItem(currItem).setActive(false); 
                    getMenuItem(--currItem).setActive(true);
                }
            }

            if (event.getCode() == KeyCode.DOWN) {
                if (currItem < box.getChildren().size() -1) {
                    getMenuItem(currItem).setActive(false);  
                    getMenuItem(++currItem).setActive(true);
                }
            }

            if (event.getCode() == KeyCode.ENTER) {
                getMenuItem(currItem).activate();
            }
        });
    }

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