java实现大数取模

import java.math.*;  import java.util.*;  public class Main {      public static void main(String[] args) {    // TODO Auto-generated method stub    BigInteger a,b;    Scanner cin = new Scanner(System.in);        while(cin.hasNext()){     a = cin.nextBigInteger();     b = cin.nextBigInteger();              BigInteger result=a.mod(b);   System.out.println(result);    }   }    }