java - Main 方法错误地显示类字符串？

Question

我正在编写一个程序，该程序提供酒店住宿的最终账单，其中包含房间号、客人人数、入住时间以及每人每晚的价格等参数。

我的 BBRoom 类中的数学正确，但它似乎没有获取和处理类参数中的信息？

驱动程序类别:

public class BedAndBreakfastDriver {

public static void main(String[] args) {

    //float price, int rmNum, int numOccupants, int duration
    //or
    //int rmNum, int numOccupants, int duration, float price

    BBRoom Smith;

    Smith = new BBRoom(29.95, 16, 1, 5);

    System.out.println(Smith);

}

}

BBRoom 类(class):

public class BBRoom {

final int MAXCAP = 4;
final int MINCAP = 1;
final int MINSTAY = 1;

int room;
int persons;
int nights;
double cost;
double surcharge;
double cleanUp;
double cottageCost;

NumberFormat fmt1 = NumberFormat.getCurrencyInstance();

BBRoom(double price, int rmNum, int numOccupants, int duration){}


BBRoom( int rmNum, int numOccupants, int duration, double price){}

       private int getRoomNumber(int rmNum){
           room = rmNum;       
           return room;
       }

       private int getPersons(int numOccupants){
           if (numOccupants < MINCAP){
               persons = MINCAP;
           }if(numOccupants > MAXCAP){
                persons = MAXCAP;
             }else{
               persons = numOccupants;
           }
           return persons;
           }

       private int getNights(int duration){   

           if(duration < MINSTAY){
               nights = MINSTAY;

           }else{

               nights = duration;

           }

           return nights;
       }

       private double setCost(double price){
           return price;

       }
       private double getCost(double price){



         if (persons < 2){
             cost = price*2*nights;
            }else{
             cost = (persons*price*nights);
         }

           return cost;
             }

        private double BBCottage(double cost){

               surcharge =  (12.95*nights);

               cleanUp = 47.99;

               cottageCost = cost+surcharge+cleanUp;

               return cottageCost;

           }

        public String toString(){

               String bill = ("Room Number"+room+"   "+"Guests:"+persons+"   "+"Nights:"+nights+"   "+"Basic Package:"+ fmt1.format(cost)+"   "+"Cottage Upgrade:"+fmt1.format(cottageCost) );
               return bill;
           }

        }

出于某种原因，我不断获得输出以将每个变量显示为

“房间号:0 客人:0 晚数:0 基本套餐:0.00 小屋升级:0.00”

如有任何帮助，我们将不胜感激。谢谢!

附注我还希望将 BBCotage 方法变成一个子类，但我不太确定如何实现这一点。如果我也能得到一些指导，那就太好了!

Answer 1

你的构造函数有一个空的主体

BBRoom(double price, int rmNum, int numOccupants, int duration){} // <<<<<<< nothing going on in {}

所有相关字段都初始化为其默认值0。实现构造函数来执行您想要的操作。