Guessing Game

package guessinggame;
import java.util.Scanner;
public class GuessingGame {

    public static void giveHighHint() {
        System.out.println("Guess a higher number.");
    }

    public static void giveLowHint() {
        System.out.println("Guess a lower number.");
    }

    public static int randomNumber(int randomNum) {
        randomNum = (int)(20 * Math.random() + 1);
        return(randomNum);
    }

    public static void main(String[] args) {
        int randomNum = 0, guess = 0;
        Scanner input = new Scanner(System.in);
        randomNum = randomNumber(randomNum);
        while (guess != randomNum) {
            System.out.print("Guess a number between 1 & 20: ");
            guess = input.nextInt();
            if (guess > randomNum) {
                giveLowHint();
            }
            else if (guess < randomNum) {
                giveHighHint();
            }
        }
        System.out.print("You guessed the right number!");
    }
}