StackOverflow Question - https://stackoverflow.com/q/78717609/2423906

Game Selector - StackOverflow

import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.stage.Stage;

public class App extends Application {
    List<Label> currentLevels = new ArrayList();
    List<Label> levels = new ArrayList();
    
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Game Levels");
        
        VBox vbox = new VBox(10);
        vbox.setAlignment(Pos.CENTER);
        vbox.setStyle("-fx-background-color: black");
        
        Label title = new Label("GAME LEVELS");
        title.setFont(Font.font("Arial", FontWeight.BOLD, 40));
        title.setTextFill(Color.WHITE);
        vbox.getChildren().add(title);

        
        for (int i = 0; i < 5; i++) {
            Label level = new Label("LEVEL " + (i + 1));
            level.setFont(Font.font("Arial", FontWeight.NORMAL, 24));
            level.setTextFill(Color.WHITE);
            level.setOnMouseClicked(this::handleLevelClick);
            levels.add(level);
            
            Label currentLevel = new Label(">");
            currentLevel.setFont(Font.font("Arial", FontWeight.BLACK, 24));
            currentLevel.setTextFill(Color.BLACK);
            currentLevels.add(currentLevel);
            
            vbox.getChildren().add(new HBox(currentLevel, level));
        }

        //Select the initial level.
        selectCurrentLevel(1);
        
        Label back = new Label("BACK");
        back.setFont(Font.font("Arial", FontWeight.NORMAL, 24));
        back.setTextFill(Color.WHITE);
        back.setOnMouseClicked(this::handleBackClick);
        vbox.getChildren().add(back);

        Scene scene = new Scene(vbox, 400, 600);
        scene.setFill(Color.BLACK);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void handleLevelClick(MouseEvent event) {
        Label source = (Label) event.getSource();
        System.out.println(source.getText() + " clicked");
        String getDigit = source.getText().replace("LEVEL ", "");
        selectCurrentLevel(Integer.parseInt(getDigit));
    }

    private void handleBackClick(MouseEvent event) {
        System.out.println("Back clicked");
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    public void selectCurrentLevel(int level)
    {
        //Set all currentLevel labels to black.
        for(int i = 0; i < currentLevels.size(); i++)
        {
            currentLevels.get(i).setTextFill(Color.BLACK);
        }
        
        //Change the currently selected currentLevel label to white.
        int index = level - 1;
        currentLevels.get(index).setTextFill(Color.WHITE);
    }
}