ArrayList is empty.. Need a help

ublic static void ViewFoodTruckInfo() {
        // 1 user wants to view information about food trucks
        // 2 User login with username and password

        System.out.println("Enter username : ");

        String username = sc.next();

        System.out.print("Enter password : ");
        String password = sc.next();
        // Username and password is searched

        User foundCust = objCustomer.searchUserByName(username);
        User foundPass = objCustomer.searchUserPassword(password);

        // If username and password is correct
        if (foundCust != null && foundPass != null) {  // If the user is a Customer  fullname and email is shown

            System.out.println("Name :  " + foundCust.getFullName());
            System.out.println(" Email :" + foundCust.getEmail());
            // Customer selects to view food trucks based on location or foodtype

            System.out.println("Do you wants to (V)iew foodTrucks  Or (R)eview foodTrucks : ?  ");
            String input = sc.next();
            if (input.equalsIgnoreCase("V")) {
                // Customer enter foodtype of location
                System.out.println("Enter truck Food Type or Location  : ");
                String stringans = sc.next();    // type or location is searched
                FoodTruck found = objFoodTruck.FoodTruckByTypeOrLoc(stringans);

                // If location or foodtype matches a FoodTruck
                if (found != null) {
                    System.out.println("FoodTruck Name  : " + found.getTruckName());  //  found food Truck Average rating and list of review is shown
                    System.out.println("Food Truck Average Rating  :  " + foundCust.getAverageRatings());
                    System.out.println("Food Truck's list of review   : " + found.getListReviewReceived().toString());

                } else {
                    System.out.println("There is no Truck by that foodtype or Location..");
                }

            } else if (input.equalsIgnoreCase("R")) {
                // method to review
                ReviewFoodTruck();

            } else {
                System.out.println("You can (V)iew or (R)eview FoodTruck Only!!");
            }

        }

    }