我的 Do-While 循环不检查我的状况？

Question

我正在使用以下代码在菜单上订购以下方法：

   public static double menu_received() {

        Scanner input = new Scanner(System.in);
        int userResponse, total = 0;

        do {

            System.out.println();
            System.out.println("Here is our menu:");
            System.out.println("1. Bulgogi -- $15.00");
            System.out.println("2. Kalbi -- $18.00");
            System.out.println("3. Kimchi Fried Rice -- $16.00");
            System.out.println("Please choose one option at one time using the number (0 to end the order):");

            userResponse = input.nextInt();
            System.out.println("User Menu choice is " + userResponse);

            if (userResponse == 1) {
                System.out.println("Thank you for ordering Bulgogi");
                total = total + 15;
                System.out.println("Your total is $" + total);
            }

            if (userResponse == 2) {
                System.out.println("Thank you for ordering Kalbi");
                total = total + 18;
                System.out.println("Your total is $" + total);
            }

            if (userResponse == 3) {
                System.out.println("Thank you for ordering Kimichi Fried Rice");
                total = total + 16;
                System.out.println("Your total is $" + total);
            }

        } while (userResponse != 0);

        double total2 = total + 2.55;
        // total = (double) total + 2.55;
        System.out.println("Your total after tax is $" + total2);

        return total2;
    }

但是，我遇到的问题是，当我调用它时，它没有按我想要的那样响应。 即使在我输入 0 后，它也不会停止调用菜单。在 while(userResponse != 0) 中我的条件是否有问题有人可以向我解释为什么以及如何纠正它？ 谢谢

这是我的输出：

>
Here is our menu:
1. Bulgogi -- $15.00
2. Kalbi -- $18.00
3. Kimchi Fried Rice -- $16.00
Please choose one option at one time using the number (0 to end the order):
1
User Menu choice is 1
Thank you for ordering Bulgogi
Your total is $15

Here is our menu:
1. Bulgogi -- $15.00
2. Kalbi -- $18.00
3. Kimchi Fried Rice -- $16.00
Please choose one option at one time using the number (0 to end the order):
1
User Menu choice is 1
Thank you for ordering Bulgogi
Your total is $30

Here is our menu:
1. Bulgogi -- $15.00
2. Kalbi -- $18.00
3. Kimchi Fried Rice -- $16.00
Please choose one option at one time using the number (0 to end the order):
0
User Menu choice is 0
Your total after tax is $32.55

Here is our menu:
1. Bulgogi -- $15.00
2. Kalbi -- $18.00
3. Kimchi Fried Rice -- $16.00
Please choose one option at one time using the number (0 to end the order):
0
User Menu choice is 0
Your total after tax is $2.55

PS：不要介意“您的税后总额为XXXX”的说法-它来自另一种方法。

Answer 1

如果我理解您上面的评论，请将您的主要内容更改为：

menu_received(); // First call
System.out.println("Value of menu_received : " + menu_received()); // Second call
tip_calculator(menu_received()); // Third call

到 ：

double result = menu_received(); // Only one call
System.out.println("Value of menu_received : " + result);
tip_calculator(result);