JAVA超大数的运算（BigInteger类）

import java.math.*;
public class javaLang {
	public static void main(String[] args){
		BigInteger m=new BigInteger("425287628746279647233986234525425423535345363534532463563463554");
		BigInteger n=new BigInteger("1451454524154154278278278272278272727278272121541213");
		BigInteger x=m.multiply(n);
		System.out.println(x);
		System.out.println("*********************************************");
		System.out.println(factorial(100));
	}
	
	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;
	}
}