Count Consonants in Java

1import java.util.Scanner;
2
3public class Main {
4    private static boolean isAlphabet(char c) {
5        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
6    }
7
8    private static boolean isVowel(char c) {
9        c = Character.toLowerCase(c);
10        return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
11    }
12
13    public static void main(String[] args) {
14        Scanner sc = new Scanner(System.in);
15        System.out.print("Enter a string: ");
16        String s = sc.nextLine();
17
18        int count = 0;
19        for (int i = 0; i < s.length(); i++) {
20            char ch = s.charAt(i);
21            if (isAlphabet(ch) && !isVowel(ch)) {
22                count++;
23            }
24        }
25        System.out.println("Consonants: " + count);
26        sc.close();
27    }
28}