how to check if a string contains all alphabets in java code example

Example: how to check if a string is in alphabetical order in java

public static boolean checkAlphabetic(String input) {
    for (int i = 0; i != input.length(); ++i) {
        if (!Character.isLetter(input.charAt(i))) {
            return false;
        }
    }

    return true;
}