码农公寓

Java的大数操作分为BigInteger和BigDecimal,但这两给类是分开使用的，有时候在编程的时候显得略微繁琐，现在编写了一个将二者合二为一的大数操作类。

大数操作类代码如下:

 

  1 package blog;
  2 
  3 import java.math.BigDecimal;
  4 import java.math.BigInteger;
  5 import java.math.RoundingMode;
  6 
  7 /**
  8  * 
  9  * @author 瓦尔登湖畔的小木屋
 10  * BigNumberOperation封装了对十进制大数整数和大数浮点数的四则运算的操作
 11  */
 12 public class BigNumberOperation {
 13     /**
 14      * 对加法的封装操作
 15      */
 16     public static BigInteger add(BigInteger number1, BigInteger number2) {
 17         return number1.add(number2);
 18     }
 19     
 20     public static BigDecimal add(BigDecimal number1, BigDecimal number2) {
 21         return number1.add(number2);
 22     }
 23     
 24     public static BigDecimal add(BigDecimal number1, BigInteger number2) {
 25         return number1.add(new BigDecimal(number2));
 26     }
 27     
 28     public static BigDecimal add(BigInteger number1, BigDecimal number2) {
 29         return new BigDecimal(number1).add(number2);
 30     }
 31     
 32     /**
 33      * 对减法的封装操作
 34      */
 35     public static BigInteger subtract(BigInteger number1, BigInteger number2) {
 36         return number1.subtract(number2);
 37     }
 38     
 39     public static BigDecimal subtract(BigDecimal number1, BigDecimal number2) {
 40         return number1.subtract(number2);
 41     }
 42     
 43     public static BigDecimal subtract(BigDecimal number1, BigInteger number2) {
 44         return number1.subtract(new BigDecimal(number2));
 45     }
 46     
 47     public static BigDecimal subtract(BigInteger number1, BigDecimal number2) {
 48         return new BigDecimal(number1).subtract(number2);
 49     }
 50     
 51     /**
 52      * 对乘法的封装操作
 53      */
 54     public static BigInteger multiply(BigInteger number1, BigInteger number2) {
 55         return number1.multiply(number2);
 56     }
 57     
 58     public static BigDecimal multiply(BigDecimal number1, BigDecimal number2) {
 59         return number1.multiply(number2);
 60     }
 61     
 62     public static BigDecimal multiply(BigDecimal number1, BigInteger number2) {
 63         return number1.multiply(new BigDecimal(number2));
 64     }
 65     
 66     public static BigDecimal multiply(BigInteger number1, BigDecimal number2) {
 67         return new BigDecimal(number1).multiply(number2);
 68     }
 69     
 70     /**
 71      * 对除法的封装
 72      * 大数浮点数时，结果默认保留10位小数，也可以通过count指定保留小数的位数
 73      * 对于最末一位的取舍采取RoundingMode.HALF_EVEN模式
 74      */
 75     public static BigInteger divide(BigInteger number1, BigInteger number2) {
 76         return number1.divide(number2);
 77     }
 78     
 79     public static BigDecimal divide(BigDecimal number1, BigDecimal number2) {
 80         return number1.divide(number2, 10, RoundingMode.HALF_EVEN);
 81     }
 82     
 83     public static BigDecimal divide(BigDecimal number1, BigDecimal number2, int count) {
 84         return number1.divide(number2, count, RoundingMode.HALF_EVEN);
 85     }
 86     
 87     public static BigDecimal divide(BigDecimal number1, BigInteger number2) {
 88         return number1.divide(new BigDecimal(number2), 10, RoundingMode.HALF_EVEN);
 89     }
 90     
 91     public static BigDecimal divide(BigDecimal number1, BigInteger number2, int count) {
 92         return number1.divide(new BigDecimal(number2), count, RoundingMode.HALF_EVEN);
 93     }
 94     
 95     public static BigDecimal divide(BigInteger number1, BigDecimal number2) {
 96         return new BigDecimal(number1).divide(number2, 10, RoundingMode.HALF_EVEN);