Question

我试着在Java中编写一个名为ShopAssit的简单程序，菜单应该是：

Welcome to ShopAssit

1. Show Shop
2. Show Price
3. Minimum Price from different shops
4. minimum price from one particular shop
5. Discount available 
0. Exit

Enter an option:

以下是必需的输出：

1. when user enters 1:
output should read;
Welcome to ShopAssit
1.Show Shop
2.Show Price
3.Minimum Price from different shops
4.minimum price from one particular shop
5.Discount available 
0.Exit
Enter an option:1
Show Shop
Enter an Option:

When user enters 2, output should read:
Welcome to ShopAssit
1.Show Shop
2.Show Price
3.Minimum Price from different shops
4.minimum price from one particular shop
5.Discount available 
0.Exit
Enter an option:1
Show shop
Enter an option:2
Show price
Enter an Option:

when 3 is entered, it should read;
Welcome to ShopAssit
1.Show Shop
2.Show Price
3.Minimum Price from different shops
4.minimum price from one particular shop
5.Discount available 
0.Exit
Enter an option:1
show shop
Enter an option:2
Show Price
Enter an Option:3
Minimum Price from different shops
Enter an option:

when 4 is entered, it should read:
Welcome to ShopAssit
1.Show Shop
2.Show Price
3.Minimum Price from different shops
4.minimum price from one particular shop
5.Discount available 
0.Exit
Enter an option:1
show shop
Enter an option:2
Show Price
Enter an option:3
Minimum Price from different shops
Enter an option
minimum Price from one particular shop
Enter an Option:

and when user enters 5, the following output is expected;
Welcome to ShopAssit
1.Show Shop
2.Show Price
3.Minimum Price from different shops
4.minimum price from one particular shop
5.Discount available 
0.Exit
Enter an option:
Discount available
Enter an Option:

when 0 is entered the following output is expected:
Welcome to ShopAssit
1.Show Shop
2.Show Price
3.Minimum Price from different shops
4.minimum price from one particular shop
5.Discount available 
0.Exit
Enter an option
Discount available
Enter an option:
Exit

如果不满足上述任何一项，最后会出现错误消息。

我已经启动了如下所示的程序，但它没有给我上面提到的所需输出。

import java.util.*;
public class MyShopAssistant {

public static void main(String[] args) {
    // TODO Auto-generated method stub

     System.out.println("Welcome to Shop Assistant Application.");
     System.out.println("1.Show Shop.");
     System.out.println("2.Show Price.");
     System.out.println("3.Minimum price from different shops.");
     System.out.println("4.Minimum price from one particular shop.");
     System.out.println("5.Discount Available.");
     System.out.println("0.Exit.");
     System.out.println();

    Scanner input =new Scanner(System.in);
    System.out.print("Enter an Option:");
    int menuNumber = input.nextInt();

switch (menuNumber)

     {   
     case 1:
          System.out.println("Show Shop!");
          System.out.print("Enter an option:");
          System.out.print(input.nextInt());

     case 2:
          System.out.println("Show Price.");
          System.out.print("Enter an option:");
          System.out.print(input.nextInt());
     case 3:
          System.out.println("Minimum Price from different shops");
          System.out.print("Enter an Option:");
          System.out.print(input.nextInt());
     case 4:
          System.out.println("4.Minimum price from one particular shop.");
          System.out.print("Enter an Option:");
          System.out.print(input.nextInt());      
     case 5:
          System.out.println("Discount!");
          System.out.print("Enter an Option:");
          System.out.print(input.nextInt());
     case 0:
         System.out.print("Exit!");
         System.out.print(input.nextInt());
     default: 
          System.out.println("Enter value between 0 and 5.");
          System.out.print("Enter an Option:");
          System.out.print(input.next());
          break;       
       }
     }       
}

Answer 1

你需要添加休息;在每个案例之后，它应该看起来像这样

case(number): 
//do stuff
break;
//other cases

Answer 2

当输入0时，预计会出现以下输出：欢迎光临商店

正如您现在所做的那样，当输入0时，您将退出。但就像其他人说的那样，必须添加那些break语句。

这里有一个很好的简单示例：https://docs.oracle.com/javase/tutorial/java/nutsandbolts/switch.html

如何在Java中获得如下所述的所需输出？

2 个答案: