08. Lower or Upper

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int x = scanner.next().charAt(0);

        if (x > 64 && x < 91) {
            System.out.println("upper-case");
        } else if (x > 96 && x < 123) {
            System.out.println("lower-case");
        }
    }
}

Solutions with methods:

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        char x = scanner.nextLine().charAt(0);

        if (Character.isUpperCase(x)) {
            System.out.println("upper-case");
        } else if (Character.isLowerCase(x)) {
            System.out.println("lower-case");
        }
    }
}

Solution with methods and ternary operator:

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        char x = scanner.nextLine().charAt(0);

        System.out.println(Character.isUpperCase(x) ? "upper-case": "lower-case");
    }
}

Or:

import java.util.Scanner;

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

        System.out.println(Character.isUpperCase(scanner.nextLine().charAt(0)) ? "upper-case": "lower-case");
    }
}