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我必須編寫一個java程序來打印收據，但是我遇到了最終值的問題。我不知道我哪裏錯了..總價值應該是：房間$ 799.50，電話$ 17.25，膳食$ 129.50，提示$ 74.87，稅務$ 51.97，而總交易$ 1073.08Java-結果總計出現問題
public class Hotel
{
//Class constants
private static final double Room_Rate = 79.95;
private static final double Tax_Rate = 6.5;
private static final double Telephone = 5.75;
private static final double Meal_Cost = 12.95;
private static final double Tip_Rate = 0.075;
//Instance Variables
private int noOfNights;
private int noOfGuests;
private double amountDue;
private double meal;
private double tax;
private double subtotal;
private double total;
private double tip;
private String roomNumber;
private static double TotalRoomCharges;
private static double TotalTelephoneCharges;
private static double TotalMealCharges;
private static double TotalTips;
private static double TotalTax;
private static double GrossTransaction;
public Hotel (String room)
{
roomNumber = room;
noOfGuests = 1;
noOfNights = 1;
}
public Hotel (String room, int nights)
{
this (room);
noOfNights = nights;
}
public Hotel (String room, int nights, int guest)
{
this (room, nights);
noOfGuests = guest;
}
public void addNights (int nights)
{
noOfNights = noOfNights + nights;
}
public void addGuest (int guests)
{
noOfGuests = noOfGuests + guests;
}
public void calculate()
{
amountDue = Room_Rate * noOfNights * noOfGuests;
tax = amountDue * Tax_Rate/100;
subtotal = amountDue + tax;
meal = Meal_Cost * noOfNights *noOfGuests;
tip = Tip_Rate * (subtotal + meal + Telephone);
total = subtotal + Telephone + meal + tip;
TotalRoomCharges = TotalRoomCharges + amountDue;
TotalTelephoneCharges = TotalTelephoneCharges + Telephone;
TotalMealCharges = TotalMealCharges + meal;
TotalTips = TotalTips + tip;
TotalTax = TotalTax + tax;
GrossTransaction = GrossTransaction + total;
}
public double getAmountDue()
{
return amountDue;
}
public double getTaxDue()
{
return tax;
}
public double getSubtotal()
{
return subtotal;
}
public double getTotal()
{
return total;
}
public double getTip()
{
return tip;
}
double getMeal()
{
return meal;
}
public String getRoomNumber()
{
return roomNumber;
}
public double getRoomRate()
{
return Room_Rate;
}
public int getNumberOfNights()
{
return noOfNights;
}
public int getNumberOfGuests()
{
return noOfGuests;
}
public static double getPhoneCharges()
{
return Telephone;
}
public static double getTaxRate()
{
return Tax_Rate;
}
public static double getTotalRoomCharges()
{
return TotalRoomCharges;
}
public static double getTotalTelephoneCharges()
{
return TotalTelephoneCharges;
}
public static double getTotalMealCharges()
{
return TotalMealCharges;
}
public static double getTotalTips()
{
return TotalTips;
}
public static double getTotalTax()
{
return TotalTax;
}
public static double getGrossTransaction()
{
return GrossTransaction;
}
}
public class TestHotel
{
public static void main(String[] args)
{
Date d = new Date();
DateFormat df = DateFormat.getDateInstance();
NumberFormat f = NumberFormat.getCurrencyInstance();
//Define customers
Hotel customer1 = new Hotel ("10 - M", 2, 2);
customer1.calculate();
display(customer1, f);
Hotel customer2 = new Hotel ("12 - B");
Hotel customer3 = new Hotel ("12 - C", 2);
customer3.calculate();
customer2.addNights(1);
customer2.calculate();
display(customer2, f);
customer3.addGuest(1);
customer3.calculate();
display(customer3, f);
display (f);
}
static void display (Hotel h, NumberFormat f)
{
//Set up and display heading and date for each receipt
System.out.println("\tThe ABC Cheap Lodging, Inc");
Date d = new Date();
DateFormat df = DateFormat.getDateInstance();
System.out.println("\tDate: \t" + df.format(d));
//Display expenses line by line including subtotal
System.out.println("Room # \t\t" + h.getRoomNumber());
System.out.println("Room Rate: \t" + f.format(h.getRoomRate()));
System.out.println("Length of Stay:\t" + h.getNumberOfNights() + " Night(s)");
System.out.println("No. of Guests: \t" + h.getNumberOfGuests());
System.out.println("Room Cost: \t" + f.format(h.getAmountDue()));
System.out.println("Tax:" + h.getTaxRate() + "%\t" + f.format(h.getTaxDue()));
System.out.println("\tSubtotal \t" + f.format(h.getSubtotal()));
System.out.println("Telephone \t" + f.format(h.getPhoneCharges()));
System.out.println("Meal Charges \t" + f.format(h.getMeal()));
System.out.println("Tip \t\t" + f.format(h.getTip()));
//Display to total
System.out.println("\nTOTAL AMOUNT DUE\t.........." + f.format(h.getTotal()));
//Display thank you message
System.out.println("\nThanks for staying at The ABC Cheap Lodging, Inc");
System.out.println("\tPlease come again !!!");
System.out.println("\n");
}
static void display (NumberFormat f)
{
System.out.println("\t\t Official Use Only");
System.out.println("\t\t Today's Summary");
System.out.println("\tRoom ....." + f.format(Hotel.getTotalRoomCharges()));
System.out.println("\tTelephone ....." + f.format (Hotel.getTotalTelephoneCharges()));
System.out.println("\tMeal ....." + f.format (Hotel.getTotalMealCharges()));
System.out.println("\tTips ....." + f.format (Hotel.getTotalTips()));
System.out.println("\tTax ....." + f.format (Hotel.getTotalTax()));
System.out.println("\t------------------------------\n");
System.out.println("\tGross Transaction .." + f.format (Hotel.getGrossTransaction()));
System.out.println("Process completed.");
}
}
如果您的當前輸出與您所需的輸出不匹配，並且您不知道爲什麼，那麼現在是時候開始調試了。如果你不確定如何去做這件事，那麼請看看：[如何調試小程序]（http://ericlippert.com/2014/03/05/how-to-debug-small-程式/）。它不會解決你的直接問題，但它會給你你可以遵循的步驟，應該可以幫助你自己解決它，或者即使這樣做不成功，那麼至少可以幫助你更好地隔離你的問題，以便你的問題可以更專注，更容易回答。 –
請勿使用雙打來表示貨幣金額。相反，使用long int來保持跟蹤ov的數量。否則，在舍入和截斷時會遇到很多麻煩。 – FredK
我建議下次再努力，仔細閱讀你的代碼，熟悉一下調試過程，以便能夠自己追蹤錯誤。此外，當閱讀「Hotel customer1 = new Hotel（...）」這樣的線路時，您應該考慮不同的類別和變量名稱。使用靜態字段計算總數也不是應該如何完成的。如果你剛剛開始用Java編程，花點時間，你學習和練習的越多，它越會變得越好。 :-) –