public class MultiplyViaRecursion{

public static void main(String[] args){

    System.out.println("8 * 9 == " + multiply(8, 9));
    System.out.println("6 * 0 == " + multiply(6, 0));
    System.out.println("0 * 6 == " + multiply(0, 6));
    System.out.println("7 * -6 == " + multiply(7, -6));
}

public static int multiply(int x, int y){
    int result = 0;

    if(y > 0)
        return result = (x + multiply(x, (y-1)));
    if(y == 0)
        return result;
    if(y < 0)
        return result = -multiply(x, -y);   

    return result;
}

}

My question is very simple and basic, why after each "if" the "return" still cannot pass the compilation, error shows missing return.