error: cannot find symbol
import java.util.*;
import java.io.*;
abstract class BreadType {
private String name;
private double cost;
private double totalSales;
private int soldQuantity;
private int totalBreadTypes;
public BreadType(String name, double cost){
this.name = name;
this.cost = cost;
}
public String getBreadName(){return name;}
public double getBreadCost(){return cost;}
public double getTotalSales(){return totalSales;}
public double getSoldQuantity(){return soldQuantity;}
public double updateCurrentSales(double price, double quantity){
double currentSale = price * quantity;
this.totalSales += currentSale;
this.soldQuantity += quantity;
return currentSale;
}
abstract public int BType();
abstract public double suggestedPrice();
abstract public double totalProfit();
abstract public void showDetails();
}
class Loaf extends BreadType{
private double profitMargin = 0.2;
public Loaf(String breadName, double breadCost){
super(breadName, breadCost);
}
public int BType(){return 2;}
public double sellingBread(double price, double quantity){
return super.updateCurrentSales(price, quantity);
}
public double suggestedPrice(){return getBreadCost() * (1 + profitMargin);}
public double totalProfit(){
return (getTotalSales() - (getBreadCost() * getSoldQuantity()));
}
public void showDetails(){
System.out.println(String.format("%-20s %-15s %-20s %10s %10s %10s %8s",
getBreadName(), " Loaf", " " + getBreadCost() + " Per Piece ",
suggestedPrice(), getSoldQuantity(), "N.A.", getTotalSales()));
}
}
public class Main {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
BreadType breads = new Loaf("Chese Loaf", 15);
double price = breads.sellingBread(15.8, 20.2); //！！！這裡報錯了！！！
}
}
//求問為什麼會報錯, 不太懂，謝謝回答
