Java: Find Vowel or Consonant

Last update on May 14 2025 13:01:08 (UTC/GMT +8 hours)

Check Vowel or Consonant

Write a Java program that requires the user to enter a single character from the alphabet. Print Vowel or Consonant, depending on user input. If the user input is not a letter (between a and z or A and Z), or is a string of length > 1, print an error message.

Test Data
Input an alphabet: p

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise8 {

    
  public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);

        System.out.print("Input an alphabet: ");
        String input = in.next().toLowerCase();

        boolean uppercase = input.charAt(0) >= 65 && input.charAt(0) <= 90;
        boolean lowercase = input.charAt(0) >= 97 && input.charAt(0) <= 122;
        boolean vowels = input.equals("a") || input.equals("e") || input.equals("i")
                || input.equals("o") || input.equals("u");

        if (input.length() > 1)
        {
            System.out.println("Error. Not a single character.");
        }
        else if (!(uppercase || lowercase))
        {
            System.out.println("Error. Not a letter. Enter uppercase or lowercase letter.");
        }
        else if (vowels)
        {
            System.out.println("Input letter is Vowel");
        }
        else
        {
            System.out.println("Input letter is Consonant");
        }
    }
}

Sample Output:

Input an alphabet: P                                                                                          
Input letter is Consonant 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to determine whether a given character is a vowel or consonant using ASCII values.
• Write a Java program to check if a single input character is a vowel by comparing it with both uppercase and lowercase vowels.
• Write a Java program to validate that the input is a single alphabet character and then classify it as vowel or consonant using a switch-case.
• Write a Java program to use regular expressions to verify if an input character is a vowel and display an error for invalid input.

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