如何在Java中獲取所需的輸出？

Question

我tryng寫在Java中稱爲ShopAssit簡單的程序在菜單中應改爲：

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: 

以下是需要的輸出：

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 

最後，如果的一個錯誤信息以上不符合。

我已經開始如下所示的程序，但它沒有給我上面提到的所需輸出。

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

您需要添加break;每一個案件後，所以它應該是這樣的

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

Answer 2

當進入下面的輸出0預計：歡迎到店

當你擁有了它，現在，當0進入你會退出。但正如其他人所說，必須添加這些斷言。

有一個很好的簡單的例子在這裏：https://docs.oracle.com/javase/tutorial/java/nutsandbolts/switch.html