Question

编译器说该语句在if语句的行上无法访问。我对Java并不过分熟悉。

public double calculate()
{
  total_usage_charge = getUsageCharge();
  total_charge = rate + total_usage_charge;

  return total_charge;

  if("A".equals(package_plan.toUpperCase()) && getUsageCharge() > 14.95)
  {
    sB = getUsageCharge() - 14.95;
    System.out.println("You're spending more money than you should. If you switched to Plan B you would save:$" + sB);
  }
}

Answer 1

因为你是通过执行这个来从方法返回的：

return total_charge;

所以下一个声明永远不会被执行。

Answer 2

您在return total_charge;语句之前从方法返回（if）。 return之后无法执行代码（如果您的return语句位于finally中，则相关try...catch...finally块除外）。

Answer 3

您在调用if语句之前返回，因此它不可缓存。

方法返回到达return语句时调用它的代码。

Answer 4

return total_charge;

此方法返回此时，发布任何代码都无法访问。

Answer 5

你已将IF语句置于IF之上。因此，当编译器每次从那里返回时都会出现此语句，如果无法随时执行，请删除return语句或将其置于条件下。

Answer 6

返回语句后不会执行代码。以下代码块导致问题，即

return total_charge;

所以你必须删除这一行或将其放在最后。！

Answer 7

public double calculate()
{
  total_usage_charge = getUsageCharge();
  total_charge = rate + total_usage_charge;

  if("A".equals(package_plan.toUpperCase()) && getUsageCharge() > 14.95)
  {
    sB = getUsageCharge() - 14.95;
    System.out.println("You're spending more money than you should. If you switched to Plan B you  would save:$" + sB);
  }

  return total_charge;
}

就像那样;）

Answer 8

**if("A".equals(package_plan.toUpperCase()) && getUsageCharge() > 14.95)
        {
            sB = getUsageCharge() - 14.95;
            System.out.println("You're spending more money than you should. If you switched to Plan B you would save:$" + sB);
        }
        else if("A".equals(package_plan.toUpperCase()) && getUsageCharge() > 19.95)
        {
            sC = getUsageCharge() - 19.95;
            System.out.println("You're spending more money than you should. If you switched to Plan C you would save:$" + sC);
        }
        else if("B".equals(package_plan.toUpperCase()) && hours < 10)
        {
            sA = getUsageCharge() - 9.95;
            System.out.println("You're spending more money than you should. If you switched to Plan A you would save:$" + sA);
        }
        else if("B".equals(package_plan.toUpperCase()) && getUsageCharge() > 19.95)
        {
            sC = getUsageCharge() - 19.95;
            System.out.println("You're spending more money than you should. If you switched to Plan C you would save:$" + sC);**
        }**

如果是的话，你是否打算发表评论？或者根据提供的代码，这是错误和无法访问的声明。

使用/* your code to comment */

进行评论

为什么说我的If语句无法访问？

8 个答案: