为什么说我的If语句无法访问？

Question

编译器说该语句在if语句的行上不可访问。 我对Java不太熟悉。

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

因为您要通过执行以下操作从方法中返回：

return total_charge;

因此，下一条语句将永远不会执行。

Answer 2

您从if语句之前的方法返回（ return total_charge; ）。 return之后无法执行任何代码（如果return语句位于try...catch...finally则相关的finally块除外）。

Answer 3

您将在调用if语句之前返回，因此它无法到达。

当方法到达return语句时，该方法返回到调用它的代码。

Answer 4

return total_charge;

您的方法此时返回，发布任何代码都将无法访问。

Answer 5

您已将返回声明放在IF上方。 因此，当编译器每次从那里返回时都使用此语句时，如果任何时候都无法执行，则删除return语句，或者将它放在Condition下方。

Answer 6

返回语句后将不执行代码。以下代码块引起问题，即

return total_charge;

因此，您将必须删除此行或将其放在末尾。

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);**
        }**

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