Java-对结果汇总有问题
我必须编写一个java程序来打印收据,但是我在打印最终值时遇到了麻烦。我不知道我哪里出错了。。总价值应为:房间799.50美元,电话17.25美元,餐费129.50美元,小费74.87美元,税金51.97美元,总交易额1073.08美元Java-对结果汇总有问题,java,Java,我必须编写一个java程序来打印收据,但是我在打印最终值时遇到了麻烦。我不知道我哪里出错了。。总价值应为:房间799.50美元,电话17.25美元,餐费129.50美元,小费74.87美元,税金51.97美元,总交易额1073.08美元 public class Hotel { //Class constants private static final double Room_Rate = 79.95; private static final double T
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.");
}
}
您正在调用
customer3.calculate()
两次。删除第一个调用,您将获得预期值。如果当前输出与所需输出不匹配,并且您不知道原因,则是时候开始调试了。如果您不确定如何执行此操作,请查看:。它不会解决你的直接问题,但它会给你提供你可以遵循的步骤,这些步骤应该可以帮助你自己解决问题,或者即使这样做不成功,那么至少可以帮助你更好地隔离你的问题,这样你的问题可以更集中,更容易回答。不要用双倍来表示货币金额。取而代之的是,使用一个长整数来记录硬币的数量。否则,您将在舍入和截断方面遇到很多麻烦。我建议您下次一定要努力,开始仔细阅读您的代码,熟悉调试,以便能够自己跟踪bug。此外,当阅读诸如<代码>酒店客户1 =新酒店(…)>代码>时,你应该考虑不同的类和变量名。使用静态字段计算总计也不是应该怎么做的。如果您刚刚开始使用Java编程,请慢慢来,学习和实践越多越好。:-)@马库斯本科谢谢你的建议。我被告知不要使用静态场进行计算,但我的教授坚持。这变得越来越容易,但由于我根本没有编程背景,我能走到这一步真是个奇迹:)啊,我没看到!非常感谢。