我是一名学习Java程序的研究生。作为家庭作业，我们要做以下事情：
现在，我的输出显示从方法返回的总数实际上是在if语句中添加所有价格，而不是将它们与已复制的用户输入数组进行协调（请参阅底部的示例输出）。除了标准数组（没有ArrayList或其他方法）之外，我们还没有涉及任何其他内容。请提供任何建议，我会尽力解决。
import java.util.Arrays;
import java.util.Scanner;
public class Online_Purchasing_HW6 {
public static final int ARRAY_LENGTH = 10; //Length of the array
public static void main(String[] args) {
Scanner input = new Scanner(System.in); //Reads user input
int[] naMenuChoice = new int [ARRAY_LENGTH]; //Array for items chosen
String[] naMenu = new String [ARRAY_LENGTH]; //Array for menu items
int[] naItemPrice = new int [9]; //Array for item prices
String sCustomerName; //String for customer's name
int nChoice = 0; //Option chosen in menu by user/Used as Index
int nSum = 0; //Sum of items chosen
double dTotalPrice = 0; //Total price plus taxes
double dTaxes = 0; //Total taxes to be applied to total
//Declare Constants
final int SENTINEL = 10; //Used to end loop
final double SALES_TAX = 0.065; //Sales tax to be used
//Choices for menu denoted by strings
String sChoice1 = "1. Smartphone" + "\t" + "\t" + "$249";
String sChoice2 = "2. Smartphone Case" + "\t" + "$39";
String sChoice3 = "3. PC Laptop" + "\t" + "\t" + "$1149";
String sChoice4 = "4. Tablet" + "\t" + "\t" + "$349";
String sChoice5 = "5. Tablet Case" + "\t" + "\t" + "$49";
String sChoice6 = "6. eReader" + "\t" + "\t" + "$119";
String sChoice7 = "7. PC Desktop" + "\t" + "\t" + "$899";
String sChoice8 = "8. LCD Monitor" + "\t" + "\t" + "$299";
String sChoice9 = "9. Laser Printer" + "\t" + "$399";
String sChoice10 = "10. Complete my order";
//Prompt user for name
System.out.print("Please enter your name: ");
//Read customer's name
sCustomerName = input.nextLine();
//Menu of items for purchase
System.out.print("\n");
System.out.println("Best Purchase Products");
System.out.println(sChoice1);
System.out.println(sChoice2);
System.out.println(sChoice3);
System.out.println(sChoice4);
System.out.println(sChoice5);
System.out.println(sChoice6);
System.out.println(sChoice7);
System.out.println(sChoice8);
System.out.println(sChoice9);
System.out.println(sChoice10);
//Prompt user for item selection
System.out.print("Please select an item from the menu above: ");
naMenuChoice[nChoice] = input.nextInt();
//Loop to read integers from user
while (naMenuChoice[nChoice] != SENTINEL) {
//adds 1 everytime more than one item is chosen by the user
nChoice++;
//Prompt user for another choice since he/she has not chosen option "10"
System.out.print("Please select another item from the menu above: ");
naMenuChoice[nChoice] = input.nextInt();
} //end of while loop
System.out.print(Arrays.toString(naMenuChoice));
//If option 10 if chosen, the loop will end with this message
System.out.println("\n" + "Thank you for ordering with Best Purchase, " + sCustomerName );
//call calculateTotalPrice method passing Array
nSum = nCalculatePrice(naMenuChoice);
//Formulas
//Sales Tax
dTaxes = SALES_TAX * nSum;
//Total Amount Due
dTotalPrice = dTaxes + nSum;
System.out.println("Total items ordered: " + nChoice);
System.out.println("Price of items ordered: $" + nSum);
System.out.println("Sales tax: $" + dTaxes);
System.out.println("Total amount due: $" + dTotalPrice);
}//end of main method
//Method for calculating price
public static int nCalculatePrice(int[] naChoicesToPrice){
int nTotalPrice = 0; //int value to return
int nIndex = 0; //used as counter
int nItemPrice = 0; //used to assign price of items
int[] naAddedPrices = new int[ARRAY_LENGTH]; //new array for assigning prices
//For loop to sum up all entries from naItemPrice array
for (nIndex = 0; nIndex < ARRAY_LENGTH; nIndex++){
naAddedPrices[nIndex] = naChoicesToPrice[nIndex];
//end of For Loop
if (nIndex == 1) {
nItemPrice = 249;
nTotalPrice += nItemPrice;}
if (nIndex == 2) {
nItemPrice = 39;
nTotalPrice += nItemPrice;}
if (nIndex == 3) {
nItemPrice = 1149;
nTotalPrice += nItemPrice;}
if (nIndex == 4) {
nItemPrice = 349;
nTotalPrice += nItemPrice;}
if (nIndex == 5) {
nItemPrice = 49;
nTotalPrice += nItemPrice;}
if (nIndex == 6) {
nItemPrice = 119;
nTotalPrice += nItemPrice;}
if (nIndex == 7) {
nItemPrice = 899;
nTotalPrice += nItemPrice;}
if (nIndex == 8) {
nItemPrice = 299;
nTotalPrice += nItemPrice;}
if (nIndex == 9) {
nItemPrice = 399;
nTotalPrice += nItemPrice;}
} //end of for loop
return nTotalPrice;
}//end of naCalculatePrice method
}//end of class
该程序的相应输出是：
Please enter your name: John Smith
Best Purchase Products
1. Smartphone $249
2. Smartphone Case $39
3. PC Laptop $1149
4. Tablet $349
5. Tablet Case $49
6. eReader $119
7. PC Desktop $899
8. LCD Monitor $299
9. Laser Printer $399
10. Complete my order
Please select an item from the menu above: 9
Please select another item from the menu above: 10
[9, 10, 0, 0, 0, 0, 0, 0, 0, 0]
Thank you for ordering with Best Purchase, John Smith
Total items ordered: 1
Price of items ordered: $3551
Sales tax: $230.815
Total amount due: $3781.815
正如您所看到的，我只从菜单中选择了一个项目，但它会累计所有价格。到目前为止，我已经在这项工作中工作了2周，而且我已经绝望了。我已经阅读了本网站上与此主题相关的大多数文章，分别阅读了许多关于方法和数组的文章，但仍然无法制定工作程序。任何帮助都将受到赞赏。
答案 0 :(得分：0)
到目前为止工作很顺利。
在您的for循环中，您必须查看naMenuChoices以查看客户订购的内容。请记住，您可能会在那里找到0或10，在这种情况下，您不应该在总和中添加任何内容。祝你好运，你离目标不远。
您可能希望自己成为
等产品/项目的课程public class Product {
private String itemText;
private int itemPrice;
public Product(String itemText, int itemPrice) {
this.itemText = itemText;
this.itemPrice = itemPrice;
}
public int getItemPrice() {
return itemPrice;
}
@Override
public String toString() {
return itemText + "\t\t$" + itemPrice;
}
}
将此类的9个对象填充到数组中，使用它们构建sChoice字符串并使用它而不是naItemPrice数组。根据您的需要修改我的代码。它应该更好地概述代码。并且消除了意外收取客户价格的风险，而不是宣布的价格。
答案 1 :(得分：0)
for (int i = 0; i < ARRAY_LENGTH; i++){
if(naChoicesToPrice[i]==0 || naChoicesToPrice[i]==10){
nItemPrice = 0;
}
else{
if (naChoicesToPrice[i] == 1) {
nItemPrice = 249;
}
if (naChoicesToPrice[i] == 2) {
nItemPrice = 39;
}
if (naChoicesToPrice[i] == 3) {
nItemPrice = 1149;
}
if (naChoicesToPrice[i] == 4) {
nItemPrice = 349;
}
if (naChoicesToPrice[i] == 5) {
nItemPrice = 49;
}
if (naChoicesToPrice[i] == 6) {
nItemPrice = 119;
}
if (naChoicesToPrice[i] == 7) {
nItemPrice = 899;
}
if (naChoicesToPrice[i] == 8) {
nItemPrice = 299;
}
if (naChoicesToPrice[i] == 9) {
nItemPrice = 399;
}
}
nTotalPrice += nItemPrice;
} //end of for loop
return nTotalPrice;
}