public static void main(String[] args) {
BigInteger aa =new BigInteger("100");
BigInteger bb= new BigInteger("25");
BigInteger sub=aa.subtract(bb);//大整数的减
BigInteger add=aa.add(bb);//大整数的加
BigInteger mul=aa.multiply(bb);//大整数的乘
BigInteger div=aa.divide(bb);//大整数的除
System.out.println(sub.toString());
System.out.println(add.toString());
System.out.println(mul.toString());
System.out.println(div.toString()); }