Factorial with BigInteger

Factorial.java

package com.hp.hpls.monsoon.servicecat.service.impl;

import java.math.BigInteger;

/**
 *
 * @author Lim, Teck Hooi
 *
 *
 */

public class Factorial {
    public static void main(String[] args) {
        System.out.println(fac(BigInteger.valueOf(100000)));
    }

    public static BigInteger fac(BigInteger j) {
        if (j.equals(BigInteger.valueOf(0))) {
            return BigInteger.valueOf(1);
        }
        return fac((j.add(BigInteger.valueOf(-1)))).multiply(j);
    }
}