Question

我有一个Java程序，旨在接受客户的输入，然后为每个客户运行一个循环。然后用户有3个选择输入：小丑，野生动物园山姆或音乐大篷车。我只是不明白我的if陈述有什么问题。您会看到，如果用户输入＆＃34; clowns＆＃34;，则相应的if语句正常工作，并执行if语句。但是，如果用户输入＆＃34; safari sam＆＃34;或＆＃34;音乐大篷车＆＃34;，if语句不执行。

我的问题是：如果执行了第一个if语句，那么为什么要跳过其他2个语句（在满足条件时不执行）？

CODE：

    import java.util.Scanner;   
    public class FunRentals {
        public static void main(String[] args) {
            Scanner new_scan = new Scanner(System.in);  
            System.out.println("Enter the amount of customers: ");
            int num_customers = new_scan.nextInt();

            for(int i = 1; i<=num_customers; i++){
                System.out.println("Please enter the service used (\"Clowns\", \"Safari Sam\", or \"Music Caravan\") for customer #"+i);
                String service_type = new_scan.next();
                String service_type_real = service_type.toLowerCase();

                if(service_type_real.equals("clowns")){ 
                    System.out.println("Please enter the amount of ADDITONAL hours");   
                    double additional_hours = new_scan.nextDouble();
                    System.out.println("The total bill for customer #" +i +" is "+ clowns(additional_hours));
                } 
                else if(service_type_real.equals("safari sam")){
                    System.out.println("Please enter the amount of ADDITONAL hours");   
                    double additional_hours = new_scan.nextDouble();
                    System.out.println("The total bill for customer #" +i +" is "+ safari_sam(additional_hours));
                } 
                else if(service_type_real.equals("music caravan")){
                    System.out.println("Please enter the amount of ADDITONAL hours");   
                    double additional_hours = new_scan.nextDouble();
                    System.out.println("The total bill for customer #" +i +" is "+ music_caravan(additional_hours));
                }

            }

        }

        public static double clowns(double a){
            double additional_cost = a*35;
            double total_cost = additional_cost + 45;
            return total_cost;
        }

        public static double safari_sam(double a){
            double additional_cost = a*45;
            double total_cost = additional_cost + 55;
            return total_cost;
        }
        public static double music_caravan(double a){
            double additional_cost = a*30;
            double total_cost = additional_cost + 40;
            return total_cost;
        }
    }

Answer 1

您需要使用nextLine()代替next()来阅读用户输入。 nextLine()会读取整行，但next()只会读取下一个单词。

Answer 2

要读取用户在控制台中提供的字符串，必须使用.nextLine（）所以尝试使用这个 -

 String service_type = new_scan.nextLine();

这应该将您在控制台中提供的任何内容的值存储到String＆＃34; service_type＆＃34;。

我的Java程序中的奇怪错误

2 个答案: