public BigInteger add(BigInteger val)：加

 public BigInteger subtract(BigInteger val)：减

 public BigInteger multiply(BigInteger val)：乘

 public BigInteger divide(BigInteger val)：除

 public BigInteger divideAndRemainder(BigInteger val)：返回 商 和 余数的数组

 package cn.itcast_02;

 import java.math.BigInteger;

 /*

  * public BigInteger add(BigInteger val):加

  * public BigInteger subtract(BigInteger val):减

  * public BigInteger multiply(BigInteger val):乘

  * public BigInteger divide(BigInteger val):除

  * public BigInteger[] divideAndRemainder(BigInteger val):返回商和余数的数组

  */

 public class BigIntegerDemo {

     public static void main(String[] args) {

         BigInteger bi1 = new BigInteger("100");

         BigInteger bi2 = new BigInteger("50");

         // public BigInteger add(BigInteger val):加

         System.out.println("add:" + bi1.add(bi2));

         // public BigInteger subtract(BigInteger val):加

         System.out.println("subtract:" + bi1.subtract(bi2));

         // public BigInteger multiply(BigInteger val):加

         System.out.println("multiply:" + bi1.multiply(bi2));

         // public BigInteger divide(BigInteger val):加

         System.out.println("divide:" + bi1.divide(bi2));

         // public BigInteger[] divideAndRemainder(BigInteger val):返回商和余数的数组

         BigInteger[] bis = bi1.divideAndRemainder(bi2);

         System.out.println("商：" + bis[0]);

         System.out.println("余数：" + bis[1]);

     }

 }