java - 代码可以编译但不能完全运行。当退出 Do While 循环时，会弹出红色错误提示

Question

import java.util.Scanner; 

public class TipCalculator{

  static double Steak; 

  static double Ribs; 

  static double Salad; 

  static double Burger; 

  static double SoftDrink; 

  static double PintofBeer; 

  static double Wine; 

  static double Champagne;

  static int i; 

  static double [] Choice = new double [15]; 

  static double Subtotal; 

  static double Tax; 

  static double Tip; 

  static double Total; 

  public static void main (String args []){ 

    Scanner scan = new Scanner (System.in);  

    Ribs = 25; 

    Steak = 35; 

    Salad = 5; 

    Burger = 15; 

    SoftDrink = 2; 

    PintofBeer = 5; 

    Wine = 6; 

    Champagne = 9; 

    Tax = 1.13; 

    do {


      System.out.println("Please enter one of the following options, or enter 9 to go to your bill"); 
      System.out.println("1. 12 oz Striploin Steak "); 
      System.out.println("2. 16 oz Baby Back Ribs "); 
      System.out.println("3. Ceaser Salad "); 
      System.out.println("4. House Burger "); 
      System.out.println("5. Soft Drink "); 
      System.out.println("6. Wine "); 
      System.out.println("7. Champagne "); 

      Choice [i] = scan.nextInt();
    }
    while (Choice [i] < 9);



    if (Choice [i] == 9){ 

      Subtotal = Choice[1] + Choice[2] + Choice[3] + Choice[4] + Choice[5] + Choice[6] + Choice[7] + Choice[8] + Choice[9] + Choice[10] + Choice[11] + Choice[12] + Choice[13] + Choice[14] + Choice[15];

      System.out.println("Your subtotal is " + Subtotal); 
    }

    System.out.println("Enter your tip percent"); 

    Tip = scan.nextInt(); 

    Total = ((Subtotal * Tax) * (Tip/10)); 

    System.out.println("Your total is " + Total); 
  } 


} 

Answer 1

您正在尝试访问数组索引 15(即数组中的第 16 个元素)，从技术上讲，该索引不存在，因为索引从 0 开始。因此您可以访问的最后一个索引是 14。由代码初始化的总元素为 15。

更改线路:

小计 = 选择[1] + 选择[2] + 选择[3] + 选择[4] + 选择[5] + 选择[6] + 选择[7] + 选择[8] + 选择[ 9] + 选择[10] + 选择[11] + 选择[12] + 选择[13] + 选择[14] + 选择[15]；


致:

小计 = 选择[0] + 选择[1] + 选择[2] + 选择[3] + 选择[4] + 选择[5] + 选择[6] + 选择[7] + 选择[ 8] + 选择[9] + 选择[10] + 选择[11] + 选择[12] + 选择[13] + 选择[14]；


这将使流程滚动。 (尽管我承认，代码并没有通过仅仅阅读你的代码来完成它应该做的事情。但这是另一回事。)