java - 如何使用数组计算数字范围？

Question

我的任务真的很简单。有人输入收入数字，如果低于 9000，则按 10% 征税，超过 9000 则按 15% 征税，等等。

但是其中一个要求是“您将在每种方法中将收入范围组织为数组，并选择一个数组记录来计算税级中的特定税”

那会如何运作？数组不是只接受特定值而不接受值范围吗？

这是我到目前为止的代码

public static int calcTax(int status, int income)
{
      if (status == 0)
      {
         return singleFiling(income);
      }
      if (status == 1)
      {   
         return jointFiling(income);
      }
      if (status == 2)
      {   
         return headFiling(income);
      }
      else
          System.out.println("Error: invalid status. Enter a number between 0 to 2 only.");
    return income;

      }

static int ninek = 9075;
static int thrirtysixk = 36900;
static int eightyninek = 89350;
static int oneeightysixk = 186350;
static int fourofivek = 405100;
static int fourosixk = 406750;
static int eighteenk = 18150;
static int seventythreek = 73800;
static int onefortyeightk = 148850;
static int twotwentysixk = 226850;
static int fourfivesevenk = 457600;
static int twelveninefifty = 12950;
static int fourninek = 49400;
static int onetwentysevenk = 127550;
static int twoosixk = 206600;
static int fpurthreetwok = 432200;

 static double tax = 0;
 static int singleFiling(double userIncome)
{
    if (userIncome >= 1 && userIncome <= ninek )
        tax = userIncome * 0.10;    

System.out.println("Your payable Federal tax is: " + tax);

return 0;
}
 static int jointFiling(double userIncome)
    {
        if (userIncome >= 1 && userIncome <= oneeightysixk )
            tax = userIncome * 0.10;    

    System.out.println("Your payable Federal tax is: " + tax);

    return 0;
    }
  static int headFiling(double userIncome)
  {
      if (userIncome >= 1 && userIncome <= twelveninefifty )
            tax = userIncome * 0.10;    

    System.out.println("Your payable Federal tax is: " + tax);

    return 0;
  }
}

Answer 1

考虑到评论，您的代码可能如下所示:

static int[] incomeLevel = new int[]{9075, 186350, 12950};
static double[] taxRate = new double[]{.1, .15, .2}

static double tax = 0.0;

public static int calcTax(int status, int income) {
    if (status < 0 || status > 2) {
        System.out.println("Error: invalid status. Enter a number between 0 to 2 only.")
        return income;
    }
    if (income > 0 && income <= incomeLevel[status])
        tax = income * taxRate[status];
    System.out.println("Your payable Federal tax is: " + tax)
    return 0;
}

当然，必须添加收入水平的其他值，税率也是如此。

您可以使用状态作为数组索引，而不是在另一个方法中计算每个值，而是通过状态进行选择。这样做的优点是只需要一次代码，而不是三次，但需要一些其他值。

现在您只需检查您的状态是否在您想要的范围内。