что делаю не так?

import java.util.Scanner;
public class Main {
    public static int sign(int number) {
        if(number > 0) {
            int a = 1;
            return a;
        }
        else  if(number < 0) {
            int a = -1;
            return a;
        }
        else  if(number == 0) {
            int a = 0;
            return a;
        }
    }
    /* Do not change code below */
    public static void main(String[] args) {
        final Scanner scanner = new Scanner(System.in);
        final int n = scanner.nextInt();
        System.out.println(sign(n));
    }
}
/*что делаю не так?
Write a method with the name sign that takes an int number and checks whether the number is negative, positive or zero. The method should return -1, +1 or 0 respectively.