Как узнать регистр символа в Java?

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public class Main {
    public static void main(String args[]) {
        char lower = 'с';
        char upper = 'С';
        
        // Вывод: true
        System.out.println(Character.isLowerCase(lower));
        // Вывод: false
        System.out.println(Character.isUpperCase(lower));

        // Вывод: true
        System.out.println(Character.isUpperCase(upper));
    }
}

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char ch = 'A';
if(Character.isUpperCase(ch)) {
    System.out.println(ch + " is an upper case letter.");
} else if(Character.isLowerCase(ch)) {
    System.out.println(ch + " is a lower case letter.");
} else {
    System.out.println(ch + " is not a letter.");
}

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A is an upper case letter.