Java BigInteger calculate factorial

import java.math.BigInteger;

public class Main {
   public static void main(String[] args) {
      System.out.println("50! is \n" + factorial(50));
   }//ww w .  j  a  v  a  2s.c o m

   public static BigInteger factorial(long n) {
      BigInteger result = BigInteger.ONE;
      for (int i = 1; i <= n; i++)
         result = result.multiply(new BigInteger(i + ""));

      return result;
   }
}