Class file

public class Hotel {

    //Class constants and variables
    private static final double ROOM_RATE = 79.95,
            TAX_RATE = 6.5,
            TELEPHONE = 5.75,
            MEAL_RATE = 12.95,
            TIP_RATE = 0.075;
    private static double totalRoom,
            totalTel,
            totalMeal,
            totalTax,
            totalTip,
            totalAmount;
    //Instance variables
    private int noOfNights, noOfGuests;
    private double amountDue, meal, tax, subTotal, total, tip;
    private String roomNumber;

    public Hotel(String room) {
        roomNumber = room;
        noOfGuests = 1;
        noOfNights = 1;
        totalRoom = totalRoom + (ROOM_RATE * noOfNights * noOfGuests);
        totalTel = totalTel + TELEPHONE;
        totalMeal = totalMeal + (MEAL_RATE * noOfNights * noOfGuests);
        totalTax = totalTax + (ROOM_RATE * noOfNights * noOfGuests) * TAX_RATE / 100;
    }

    public Hotel(String room, int nights) {
       roomNumber = room;
       noOfGuests = 1;
       noOfNights = nights;
       totalRoom = totalRoom + (ROOM_RATE * nights * noOfGuests);
       totalTel = totalTel + TELEPHONE;
       totalMeal = totalMeal + (MEAL_RATE * nights * noOfGuests);
       totalTax = totalTax + (ROOM_RATE * nights * noOfGuests) * TAX_RATE / 100;
    }

    public Hotel(String room, int nights, int guests) {
        roomNumber = room;
        noOfNights = nights;
        noOfGuests = guests;
        totalRoom = totalRoom + (ROOM_RATE * nights * guests);
        totalTel = totalTel + TELEPHONE;
        totalMeal = totalMeal + (MEAL_RATE * nights * guests);
        totalTax = totalTax + (ROOM_RATE * nights * guests) * TAX_RATE / 100;
    }

    //mutator for individual summaries
    public void calculate() {
        amountDue = ROOM_RATE * noOfNights * noOfGuests;
        tax = amountDue * (TAX_RATE / 100);
        subTotal = amountDue + tax;
        meal = MEAL_RATE * noOfNights * noOfGuests;
        tip = TIP_RATE * (subTotal + meal + TELEPHONE);
        total = subTotal + TELEPHONE + meal + tip;

    }

//mutator for addition of more nights
    public void addNights(int nights) {
        noOfNights = noOfNights + nights;
        totalRoom = totalRoom + (ROOM_RATE * nights * noOfGuests);
        totalMeal = totalMeal + (MEAL_RATE * nights * noOfGuests);
        totalTax = totalTax + (ROOM_RATE * nights * noOfGuests) * TAX_RATE / 100;
    }
//mutator for addition of more guests
    public void addGuest(int guests) {
        noOfGuests = noOfGuests + guests;
        totalRoom = totalRoom + (ROOM_RATE * noOfNights * guests);
        totalMeal = totalMeal + (MEAL_RATE * noOfNights * guests);
        totalTax = totalTax + (ROOM_RATE * noOfNights * guests) * TAX_RATE / 100;
    }