Finding Factorial of a number Program. Java

Q: 4(a) Write an application that reads a nonnegative integer from an input dialog and computes and prints its factorial.

import java.util.Scanner;

public class fact {

    public static void main(String args[])
    {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the number to find Fictorial: ");
        int num = input.nextInt();
        if(num < 0 )
            System.out.println("Negative values not allowed, Enter value greater than 0");
        else
            System.out.println("Answer: "+factorial(num));
       
    }

    public static long factorial(int n)
    {
        int x;
       
    if(n == 0)
    {
        return 0;
    }
    else
    {
        if(n == 1)
        {
            return 1;
        }
        else if(n > 1)
        {
            return n*factorial(n-1);
        }
    }
        return 0;
    }
   
}