Factorial of a number using recursion

/*
 This program shows how to calculate
 Factorial of a number using recursion function.
 */

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class JavaFactorialUsingRecursion {

    public static void main(String args[]) throws NumberFormatException,
            IOException {
        System.out.println("Enter the number: ");
//get input from the user
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int a = Integer.parseInt(br.readLine());
//call the recursive function to generate factorial
        int result = fact(a);
        System.out.println("Factorial of the number is: " + result);
    }

    static int fact(int b) {
        if (b <= 1) //if the number is 1 then return 1
        {
            return 1;
        } else //else call the same function with the value - 1
        {
            return b * fact(b - 1);
        }
    }
}
/*
Output of this Java example would be
Enter the number:
5
Factorial of the number is: 120
*/