BigInteger运算

四则运算（add（加）、subtract（减）、multiply（乘）、divide（除）、remainder（余））

代码如下：

public class TestBigInteger {

public static void main(String[] args) {
// TODO Auto-generated method stub
BigInteger big1 = new BigInteger("100");
BigInteger big2 = new BigInteger("10");
System.out.println(big1.add(big2));//+
System.out.println(big1.subtract(big2));//-
System.out.println(big1.multiply(big2));//*
System.out.println(big1.divide(big2));//÷
System.out.println(big1.remainder(big2));//%
　　}

}