Count Consonants

import java.util.Scanner;

public class Main {
    private static boolean isAlphabet(char c) {
        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
    }

    private static boolean isVowel(char c) {
        c = Character.toLowerCase(c);
        return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a string: ");
        String s = sc.nextLine();

        int count = 0;
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);
            if (isAlphabet(ch) && !isVowel(ch)) {
                count++;
            }
        }
        System.out.println("Consonants: " + count);
        sc.close();
    }
}