Example: Java program to check whether input character is vowel or consonant using if-else

// Java program to check whether input character is vowel or consonant using if-else
import java.util.Scanner;

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

        System.out.print("Enter a character to check: ");

        char random_character = in.next().charAt(0);
        boolean lowercase = false, uppercase = false;

        // Character.isalpha() function will check
        // whether character is alphabetic or non-alphabetic
        if (Character.isAlphabetic(random_character)) {

            // it will be return 1
            // if input character matched with these small characters
            lowercase = random_character == 'a' || random_character == 'e' || random_character == 'i' || random_character == 'o' || random_character == 'u';
            
            // it will be return 1
            // if input character matched with these capital characters
            uppercase = random_character == 'A' || random_character == 'E' || random_character == 'I' || random_character == 'O' || random_character == 'U';
           
            if (lowercase || uppercase)
                System.out.println("\n'" + random_character + "' is a vowel character.");
            else
                System.out.println("\n'" + random_character + "' is a consonant character.");
        } else {
            System.out.println("\nSorry, You entered Non-Alphabetic character!");
        }
    }
}