当输入中有一个空格时，它会复制。

Question

首先，我想当他们给一个错误的输入，请那错误的输入写在那里的逻辑输入。

当我按下空格时，每一个空格都会重复替换。

喜欢

请输入送货速度。

如果要查看所有的交付速度选项，请输入“选项”。

24小时

输入错误，请阅读选项，并注意大写字母。

请输入送货速度。

如果要查看所有的交付速度选项，请输入“选项”。

输入错误，请阅读选项，并注意大写字母。

请输入送货速度。

如果要查看所有的交付速度选项，请输入“选项”。

123 123 123

输入错误，请阅读选项，并注意大写字母。

请输入送货速度。

如果要查看所有的交付速度选项，请输入“选项”。

输入错误，请阅读选项，并注意大写字母。

请输入送货速度。

如果要查看所有的交付速度选项，请输入“选项”。

输入错误，请阅读选项，并注意大写字母。

请输入送货速度。

如果要查看所有的交付速度选项，请输入“选项”。

这是我的密码。

请帮帮我。

   import java.util.InputMismatchException;
    import java.util.Scanner;
    public class deneme123 {
       public static void main(String[] args){
          String opt=null;
          Scanner input=new Scanner(System.in);
           double cost= 0.0;
          while (true) {
               while (true) {
                   System.out.println("Please enter a delivery speed.\nIf you want to see all options of delivery speed, enter 'options'.");
                  try {
                      opt = input.next();
                     break;
                 }
                 catch (InputMismatchException e) {
                     System.out.println("Wrong type, pls try again!");
                      input.nextLine();
                  }
              }
              if (opt.equals("fast")) {
                  cost = cost + 34.9;
                 System.out.println("Total is updated to " + cost + "$");
                 break;
              }
              else if (opt.equals("average")) {
                  cost = cost + 17.5;
                  System.out.println("Total is updated to " + cost + "$");
                  break;
              }
              else if (opt.equals("standart")) {
                  cost = cost + 5.5;
                  System.out.println("Total is updated to " + cost + "$");
                 break;
                }
                else if (opt.equals("VIP")||opt.equals("vip")||opt.equals("Vip")) {
                   cost = cost + 50;
                  System.out.println("Total is updated to " + cost + "$");
                  break;
               }
                else if (opt.equals("options")) {
                  System.out.println("* For VIP delivery speed enter 'VIP'. (costs 50 $) " +
                           "\n* For fast delivery speed enter 'fast'. (costs 34.9 $) " +
                           "\n* For average delivery speed enter 'average' (costs 17.5 $)" +
                           "\n* For standart delivey speed enter 'standart' (costs 5.5 $)");
               }
              else {
                   System.out.println("Wrong type, please read options and be careful with the capital letters.");
               }
          }
     }
    }

Answer 1

我稍微修改了你的代码。在代码下面，我展示了运行它时得到的输出。

package deneme23;
import java.util.InputMismatchException;
    import java.util.Scanner;
/**
 *
 * @author davec
 */
public class Deneme23 {



       public static void main(String[] args){
          String [] opts=null;
          Scanner input=new Scanner(System.in);
           double cost= 0.0;
           OUTER:
           while (true) {
               while (true) {
                   System.out.println("Please enter a delivery speed.\nIf you want to see all options of delivery speed, enter 'options'.");
                   try {
                       String line = input.nextLine();
                       opts = line.split("\\s");
                       break;
                   }
                   catch (InputMismatchException e) {
                       System.out.println("Wrong type, pls try again!");
                       input.nextLine();
                   }
               }switch (opts[0]) {
                   case "fast":
                       cost = cost + 34.9;
                       System.out.println("Total is updated to " + cost + "$");
                       break OUTER;
                   case "average":
                       cost = cost + 17.5;
                       System.out.println("Total is updated to " + cost + "$");
                       break OUTER;
                   case "standart":
                       cost = cost + 5.5;
                       System.out.println("Total is updated to " + cost + "$");
                       break OUTER;
                   case "VIP":
                   case "vip":
                   case "Vip":
                       cost = cost + 50;
                       System.out.println("Total is updated to " + cost + "$");
                       break OUTER;
                   case "options":
                       System.out.println("* For VIP delivery speed enter 'VIP'. (costs 50 $) " +
                               "\n* For fast delivery speed enter 'fast'. (costs 34.9 $) " +
                               "\n* For average delivery speed enter 'average' (costs 17.5 $)" +
                               "\n* For standart delivey speed enter 'standart' (costs 5.5 $)");
                       break;
                   default:
                       System.out.println("Wrong type, please read options and be careful with the capital letters.");
                       break;
               }
           }
     }
    } 

这是我运行它时得到的输出：

Please enter a delivery speed.
If you want to see all options of delivery speed, enter 'options'.
24 hours
Wrong type, please read options and be careful with the capital letters.
Please enter a delivery speed.
If you want to see all options of delivery speed, enter 'options'.
options
* For VIP delivery speed enter 'VIP'. (costs 50 $) 
* For fast delivery speed enter 'fast'. (costs 34.9 $) 
* For average delivery speed enter 'average' (costs 17.5 $)
* For standart delivey speed enter 'standart' (costs 5.5 $)
Please enter a delivery speed.
If you want to see all options of delivery speed, enter 'options'.
fast
Total is updated to 34.9$