JAVA選單驅動程序，用於檢查字元是字串、數字還是特殊字符

在本文中，我們將看到一個使用Java程式語言實作的選單驅動程序，用於檢查輸入的字元是數字、字串還是特殊字元。我們將使用switch case來實作這個應用程式。

向您展示一些實例

實例-1

Suppose the entered character is ‘a’ then the output should be “Entered character is a String”.

Instance-2

的中文翻譯為：

實例-2

Suppose the entered character is ‘1’ then the output should be “Entered character is a number”.

Instance-3

的中文翻譯為：

實例-3

Suppose the entered character is ‘$’ then the output should be “Entered character is a Special character”.

文法

在Java中，我們使用isLetter、isDigit或isWhitespace函數來檢查一個字元是字串、數字還是特殊字元。使用isLetter函數來檢查字串，使用isDigit函數來檢查數字，使用isLetter、isDigit和isWhitespace函數的組合來檢查特殊字元。

以下是字串函數的語法

Character.isLetter(ob1)

以下是數字函數的語法

Character.isDigit(ob1)

以下是字串函數的語法

(!Character.isDigit(ob1)&& !Character.isLetter(ob1)&& !Character.isWhitespace(ob1))

演算法

步驟-1 − 要求使用者輸入所需的字元。

第 2 步 - 顯示選單。

第 3 步 - 要求使用者輸入他們的選擇。

Step-4 - 使用開關盒轉到選擇並執行操作。

第 5 步 - 列印結果。

讓我們看看程式就可以清楚地理解它。

範例

import java.util.*;
public class Main {
   public static void main(String args[]) {
      Scanner sc = new Scanner( System.in );
      System.out.println("Enter a character to check if it's a Number, String or a Special character");
      char ob1 = sc.next().charAt(0);

      System.out.println("Now choose the operation you want to perform from the menu given below. ");

      mainLoop: while (true) {
         Scanner inn = new Scanner( System.in );
         System.out.println("\n***Menu***");
         System.out.println("1. Check if a character is number");
         System.out.println("2. Check if a character is String");
         System.out.println("3. Check if a character is Special character");
         System.out.println("4. Terminate the program");
         System.out.println("Enter action number (1-4): ");
         int command;
         if ( inn.hasNextInt() ) {
            command = inn.nextInt();
            inn.nextLine();
         }
         else {
            System.out.println("\nILLEGAL RESPONSE. YOU MUST ENTER A NUMBER.");
            inn.nextLine();
            continue;
         }
         switch(command) {
            case 1:
            if (Character.isDigit(ob1)) {
               System.out.println("Character is a number!");
            } else {
               System.out.println("Character is not a number!");
            }
            break;
            case 2:
            if (Character.isLetter(ob1)) {
               System.out.println("Character is a String!");
            } else {
               System.out.println("Character is not a String!");
            }
            break;
            case 3:
            if (!Character.isDigit(ob1)
            && !Character.isLetter(ob1)
            && !Character.isWhitespace(ob1)) {
               System.out.println("Character is a Special Character!");
            } else {
               System.out.println("Character is not a Special Character!");
            }
            break;
            case 4:
            System.out.println("Program terminated");
            break mainLoop;
            default:
            System.out.println("Wrong choice!!");
         }

      }

   }
}

輸出

Enter a character to check if it's a Number, String or a Special character
t
Now choose the operation you want to perform from the menu given below.
***Menu***
1. Check if a character is number
2. Check if a character is String
3. Check if a character is Special character
4. Terminate the program
Enter action number (1-4):
1
Character is not a number!
***Menu***
1. Check if a character is number
2. Check if a character is String
3. Check if a character is Special character
4. Terminate the program
Enter action number (1-4):
3
Character is not a Special Character!
***Menu***
1. Check if a character is number
2. Check if a character is String
3. Check if a character is Special character
4. Terminate the program
Enter action number (1-4):
2
Character is a String!
***Menu***
1. Check if a character is number
2. Check if a character is String
3. Check if a character is Special character
4. Terminate the program
Enter action number (1-4):
$
ILLEGAL RESPONSE. YOU MUST ENTER A NUMBER.
***Menu***
1. Check if a character is number
2. Check if a character is String
3. Check if a character is Special character
4. Terminate the program
Enter action number (1-4):
1
Character is not a number!
***Menu***
1. Check if a character is number
2. Check if a character is String
3. Check if a character is Special character
4. Terminate the program
Enter action number (1-4):
3
Character is not a Special Character!
***Menu***
1. Check if a character is number
2. Check if a character is String
3. Check if a character is Special character
4. Terminate the program
Enter action number (1-4):
2
Character is a String!
***Menu***
1. Check if a character is number
2. Check if a character is String
3. Check if a character is Special character
4. Terminate the program
Enter action number (1-4):
4
Program terminated

在本文中，我們透過使用選單驅動的方法，探討如何在Java中檢查一個字元是否為字串、數字或特殊字元。

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