Java编程简单的If/Else语句项目

Question

好吧，伙计们，我一直在尝试用 java 编写一些代码，我无法获取代码来显示全尺寸的定价选项。 我无法让程序继续执行我列为案例 2 的第二个选项。

该项目基本上为用户提供了询问他是否租车的选项[是或否]:

• 如果输入Y则下一个问题

  • 它询问的是“全尺寸紧凑型？”，
    • 如果用户选择紧凑，项目将显示用户已选择紧凑，并且
    • 如果代码显示 fullsize，则项目将显示用户已选择 fullsize。

• 然后它会询问用户是否有优惠券，如果用户对优惠券回答 Y，则价格为 30.50 的 7% 折扣。

  • 如果用户回答 N，则价格为正常的 30.50。全尺寸正常价格为 40.50，带优惠券的价格为 40.50 的 7% 折扣。以下是我目前编写的代码。

代码:

public class CarRental {
    public static void main(String[] args) {
        for (int i = 0; i < 4; i++) {

            System.out.println("Programmed by .");

            double standardCompact = 30.50;
            double couponCompact = ((30.50) - (30.50 * 0.07));
            double standardFullSize = 40.50;
            double couponFullSize = ((40.50) - (40.50 * 0.07));

            //Scanner Input
            Scanner input = new Scanner(System.in);
            System.out.print("Rent a Car? [Y or N]: ");

            //Response String
            String response = input.next().toUpperCase();

            if (response.equals("N")) {
                System.out.println("You entered no. Bye. ");
            } else if (response.equals("Y")) {
                System.out.print("Compact or Full-Size? [C or F]: ");

                //case1
                response = input.next().toUpperCase();
                if (response.equals("C")) {
                    System.out.println("You selected Compact. ");
                } else if (response.equals("F")) {
                    System.out.println("You have selected Full-Size. ");

                    System.out.print("Have coupon? [Y or N]: ");
                    response = input.next().toUpperCase();
                    if (response.equals("N")) {
                        System.out.println("Price is" + " " + standardCompact + " " + "per     day.");
                    } else if (response.equals("Y")) {
                        System.out.println("Price is" + " " + couponCompact + " " + "per day.");
                        //case 2
                        response = input.next().toUpperCase();
                        if (response.equals("F")) {
                            System.out.println("You have selected Full-Size.");
                            System.out.println("Have coupon? [Y or N]: ");
                            response = input.next().toUpperCase();
                            if (response.equals("N")) {
                                System.out.println("Price is" + " " + standardFullSize + " " + "per day.");
                            } else if (response.equals("Y")) {
                                System.out.println("Price is" + " " + couponFullSize + " " + "per day.");

                            }
                        }
                    }

Answer 1

您在 else 子句后面缺少一些 }。示例:

        response = input.next().toUpperCase();
        if (response.equals("C")) {
            System.out.println("You selected Compact. ");
            //Put code that should only execute if you select Compact here.
        }else if(response.equals("F")){
            System.out.println("You have selected Full-Size. ");
            //Put code that should only execute if you select Full-size here.
        //Should have a } here!
        //Put code that should always execute here.

因为您从未关闭 else 子句中的代码块，所以后面的所有代码仍然是 else 的一部分，因此只有在以下情况下才会执行else 被选中，但并非在所有情况下都如您所愿。