我正在编写一个包含驱动程序圣代程序和圣代课程的程序。我在编译时没有错误。
import java.util.Scanner;
public class SundaeDriver
{
public static void main(String[] args)
{
Sundae newSundae = new Sundae();
Scanner input = new Scanner(System.in);
System.out.println("Which sundae flavor would you like? ");
newSundae.setFlavor(input.nextLine());
if ((newSundae.getFlavor().equalsIgnoreCase("vanilla"))||
(newSundae.getFlavor().equalsIgnoreCase("peanut butter"))||
(newSundae.getFlavor().equalsIgnoreCase("chocolate"))||
(newSundae.getFlavor().equalsIgnoreCase("cocoanut"))||
(newSundae.getFlavor().equalsIgnoreCase("cookie dough"))||
(newSundae.getFlavor().equalsIgnoreCase("coffee"))||
(newSundae.getFlavor().equalsIgnoreCase("strawberry"))||
(newSundae.getFlavor().equalsIgnoreCase("butter pecan")))
{
}
else
{
newSundae.setDefault();
newSundae.Print();
}
System.out.println("How many scoops?");
newSundae.setNumberOfScoops(input.nextInt());
if ((newSundae.getNumberOfScoops()==1)||
(newSundae.getNumberOfScoops()==2)||
(newSundae.getNumberOfScoops()==3)||
(newSundae.getNumberOfScoops()==4)||
(newSundae.getNumberOfScoops()==5)||
(newSundae.getNumberOfScoops()==6))
{
}
else
{
newSundae.setDefault();
newSundae.Print();
}
System.out.println("How many free toppings would you like");
int num = input.nextInt();
input.nextLine();
for (int i = 0; i<num;i++)
{
System.out.println("what free toppings would you like?");
String temp=input.nextLine();
if ((temp.equalsIgnoreCase("whipped cream"))||
(temp.equalsIgnoreCase("hot fudge syrup"))||
(temp.equalsIgnoreCase("multi colored sprinkles"))||
(temp.equalsIgnoreCase("cherry")))
{
newSundae.setStdTopping(temp);
}
else
{
newSundae.setDefault();
newSundae.Print();
}
}
System.out.println("What free syrup would you like?");
newSundae.setFreeSyrupChoice(input.nextLine());
if ((newSundae.getFreeSyrupChoice().equalsIgnoreCase("hot fudge"))||
(newSundae.getFreeSyrupChoice().equalsIgnoreCase("chocolate"))||
(newSundae.getFreeSyrupChoice().equalsIgnoreCase("caramel"))||
(newSundae.getFreeSyrupChoice().equalsIgnoreCase("strawberry")))
{
}
else
{
newSundae.setDefault();
newSundae.Print();
}
System.out.println("How many deluxe toppings would you like?");
num = input.nextInt();
input.nextLine();
for (int i = 0; i<num; i++)
{
System.out.println("what extra toppings would you like");
String deluxe=input.nextLine();
if ((deluxe.equalsIgnoreCase("M&Ms"))||
(deluxe.equalsIgnoreCase("crushed oreos"))||
(deluxe.equalsIgnoreCase("reeses peices"))||
(deluxe.equalsIgnoreCase("bwonie crunches"))||
(deluxe.equalsIgnoreCase("mint chocolate chip"))||
(deluxe.equalsIgnoreCase("marshmallows"))||
(deluxe.equalsIgnoreCase("peanuts"))||
(deluxe.equalsIgnoreCase("walnuts"))||
(deluxe.equalsIgnoreCase("peanuts and walnuts")))
{
newSundae.setDeluxTopping(deluxe);
}
else
{
newSundae.setDefault();
newSundae.Print();
}
}
}
}
当用户输入正确的圣代风味，免费浇头的类型和数量以及常规浇头时，该程序应该在结束时显示总价格。但是，当用户输入所有数据时，程序才会结束。
public class Sundae
{
private String flavor;
private int numberOfScoops;
private double costForScoops;
private String [] stdToppingList=new String [4];
private String freeSyrupChoice;
private String [] deluxeToppingList= new String [9];
private int counterD= 0;
private double costOfDeluxeToppings;
private double costOfSundae;
private final double SALES_TAX= .08625;
private double tax;
private final double COST_PER_DELUXE_TOPPING =.75;
private int counterFree=0;
public Sundae()
{
flavor= " vanilla ";
numberOfScoops=2;
costForScoops=2.79;
stdToppingList[0]=" whipped cream ";
stdToppingList[1]=" hot fudge syrup ";
stdToppingList[2]=" multi colored sprinkles ";
stdToppingList[3]=" cherry ";
}
public String getFlavor()
{
return flavor;
}
public int getNumberOfScoops()
{
return numberOfScoops;
}
public double getCostForScoops()
{
return costForScoops;
}
public String [] getStdTopping()
{
return stdToppingList;
}
public String getFreeSyrupChoice()
{
return freeSyrupChoice;
}
public String [] getDeluxeTopping()
{
return deluxeToppingList;
}
public int getCounterD()
{
return counterD;
}
public double getCostDeluxeToppings()
{
return costOfDeluxeToppings;
}
public double getCostOFSundae()
{
return costOfSundae;
}
public void setFlavor( String selection )
{
flavor=selection;
}
public void setNumberOfScoops(int number)
{
numberOfScoops= number;
}
public void setCostForScoops()
{
costForScoops= numberOfScoops + .79;
}
public void setStdTopping( String toppings )
{
stdToppingList[counterFree] = toppings;
counterFree++;
}
public void setFreeSyrupChoice( String syrup )
{
freeSyrupChoice= syrup;
}
public void setDeluxTopping (String xtraToppings)
{
deluxeToppingList[counterD] = xtraToppings;
counterD++;
}
public void setDefault()
{
flavor= " vanilla ";
numberOfScoops= 2;
costForScoops=2.79;
stdToppingList[0] = " whipped cream ";
stdToppingList[1] = " hot fudge syrup ";
stdToppingList[2] = " multi colored sprinkles ";
stdToppingList[3] = " cherry" ;
}
public void Print()
{
System.out.println(flavor + " "+ numberOfScoops+ " " + costForScoops +
" " + stdToppingList[0] + " " + stdToppingList[1] + stdToppingList[2] + stdToppingList[3]);
setCostForScoops();
costOfDeluxeToppings = COST_PER_DELUXE_TOPPING*counterD;
costOfSundae = costOfDeluxeToppings + costForScoops;
tax=SALES_TAX*costOfSundae;
System.out.printf("Subtotal : $%.2f, tax: $%.2f, grand total: $%.2f " ,
costOfSundae, tax, (costOfSundae+tax));
}
}
每当用户键入非用户定义的字符串或值时，我都会收到奇怪的显示消息
C:\Users\DrewS>java SundaeDriver
Which sundae flavor would you like?
yes//purposly inputting value, should default to defsualt flavor vanilla at 2 scoops with all 4 free toppings.
vanilla 2 2.79 [Ljava.lang.String;@5c647e05
Subtotal : $2.79, tax: $0.24, grand total: $3.03 How many scoops?
6
How many free toppings would you like
3
what free toppings would you like?
whipped cream
what free toppings would you like?
hot fudge
vanilla 2 2.79 [Ljava.lang.String;@5c647e05//weird thing keeps printing
Subtotal : $2.79, tax: $0.24, grand total: $3.03 what free toppings would you l
ke?
hot fudge syrup
What free syrup would you like?
chocolate
How many deluxe toppings would you like?
1
what extra toppings would you like?
mint chocolate chip
答案 0 :(得分：1)
你的“问题”（这不是一个真正的问题，我会解释）来自：
public void Print()
{
System.out.println(flavor + " "+ numberOfScoops+ " " + costForScoops +
" " +stdToppingList);
你看，当你打电话给println()时，java会尝试为每个元素调用它的方法toString()
numberofScoops.toString()工作正常，因为它是一个整数，方法toString()已经定义。
关键是，当对象的toString（）方法未定义时，它会打印对象的名称和所述对象的地址，例如，如果我们采用你的{{ 1}}（请注意，它是字符串表，而不是字符串）：
stdToppingList [Ljava.lang.String;@5c647e05
是它包含的内容，您的对象是一个字符串表。 Ljava.lang.String是其哈希码。
对于“修复”，您需要逐个显示表格的所有元素：
@5c647e05由于stdToppingList中总是有4个元素，因此可以安全地打印它们。或者，如果您要保存用户想要的浇头数量，您可以迭代它。
好的，既然我们已经修复了你的public void Print()
{
System.out.println(flavor + " "+ numberOfScoops+ " " + costForScoops +
" " + stdToppingList[0] + " " + stdToppingList[1] + stdToppingList[2] + stdToppingList[3]);
功能，让我们深入研究（就像我经常挖掘我的圣代）主要问题，你的主要问题。你的主要是邪恶的，通过你的主要就像看到魔鬼。当我写作线条时，我向Linus祈祷，为我灵魂的圣洁拯救。
无论如何，让我们从代码中的错误开始：
我建议你重构你的主人，一旦你做完就回到这里，我会等你。
让我感到饥饿的上帝。
答案 1 :(得分：0)
在print()功能中
System.out.println(flavor + " "+ numberOfScoops+ " " + costForScoops +
" " +stdToppingList);
stdToppingList是String[]，而不是字符串。打印一个数组会给你一个奇怪的东西，Object.toString()的javadoc所说的是
the name of the class + `@` + a hexadecimal representation of the object's hashcode
为了在Java中打印基本数组，您可以获得一个for循环并打印每个元素和一个空格，或使用类似于Arrays.toString(stdToppingList)的内容。