Java program to calculate 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());
   int result = fact(a);            //call the recursive function to generate factorial
   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
*/