Question

我一直在努力将这个问题正确编码好一个小时，我无法弄明白。这种方法用成人票，学生票，如果它是一个日场，如果它是在工作日，以及他们将要看的电影，计算去看电影的成本。

首先，我在每个if语句之后放入一个return语句，它说该方法没有return语句。现在，我把它放在方法的末尾，并且无法识别变量 cost ，因为 cost 在if语句中。

对所有文字感到抱歉。这是代码。

public static int getCost (char movie, int month, int day, boolean isMatinee, int numberOfAdultTickets, int numberOfStudentTickets)
    {
        if (movie == 'C')
        {
            if (isWeekday(month, day))
            {
                if (isMatinee)
                {
                    int cost = (numberOfAdultTickets*8) + (numberOfStudentTickets*8);
                }
                else if (!isMatinee)
                {
                    int cost = (numberOfAdultTickets*10) + (numberOfStudentTickets*8);
                }
            }
            else if (!isWeekday(month, day))
            {
                if (isMatinee)
                {
                    int cost = (numberOfAdultTickets*11) + (numberOfStudentTickets*11);
                }
                if (!isMatinee)
                {
                    int cost = (numberOfAdultTickets*13) + (numberOfStudentTickets*11);
                }
            }
        }
        else if (movie == 'G')
        {
            if (isWeekday(month, day))
            {
                if (isMatinee)
                {
                    int cost = (numberOfAdultTickets*6) + (numberOfStudentTickets*6);
                }
                else if (!isMatinee)
                {
                    int cost = (numberOfAdultTickets*8) + (numberOfStudentTickets*6);
                }
            }
            else if (!isWeekday(month, day))
            {
                if (isMatinee)
                {
                    int cost = (numberOfAdultTickets*9) + (numberOfStudentTickets*9);
                }
                else if (!isMatinee)
                {
                    int cost = (numberOfAdultTickets*11) + (numberOfStudentTickets*9);
                }
            }
        }
        else if (movie == 'P')
        {
            if (isWeekday(month, day))
            {
                if (isMatinee)
                {
                    int cost = (numberOfAdultTickets*6) + (numberOfStudentTickets*6);
                }
                else if (!isMatinee)
                {
                    int cost = (numberOfAdultTickets*8) + (numberOfStudentTickets*6);
                }
            }
            else if (!isWeekday(month, day))
            {
                if (isMatinee)
                {
                    int cost = (numberOfAdultTickets*9) + (numberOfStudentTickets*9);
                }
                else if (!isMatinee)
                {
                    int cost = (numberOfAdultTickets*11) + (numberOfStudentTickets*9);
                }
            }
        }
        return cost;
    }

Answer 1

您需要在方法范围中声明成本变量，在if语句之外，例如

int cost = 0;
if (movie == 'C')
    {
        if (isWeekday(month, day))
        {
            if (isMatinee)
            {
                cost = (numberOfAdultTickets*8) + (numberOfStudentTickets*8);
            }
            else if (!isMatinee)
            {
                cost = (numberOfAdultTickets*10) + (numberOfStudentTickets*8);
            }
        }
    } else if... //rest of your code.

    return cost;
}

Answer 2

这解决了您的问题：

public static int getCost (char movie, int month, int day, boolean isMatinee, int numberOfAdultTickets, int numberOfStudentTickets)
{
 int cost = 0
//there will be the rest of code you already have
}

然而，最大的问题是，如果 - 其他疯狂:)。看看如何使用类。

在我的退货声明中找不到符号？ Java的

2 个答案: