BigDecimal除法报异常java.lang.ArithmeticException

通过BigDecimal的divide方法进行除法时当不整除，出现无限循环小数时，就会抛异常的，异常如下：java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result. at java.math.BigDecimal.divide(Unknown Source) 

解决之道：就是给divide设置精确的小数点divide(xxxxx,2, BigDecimal.ROUND_HALF_EVEN)

注意不能写成 如下形式,不然依然会报错divide(xxxx).setScale(2, BigDecimal.ROUND_HALF_EVEN)(错误的)

BigDecimal定义了一下舍入模式，只有在作除法运算或四舍五入时才用到舍入模式，下面简单介绍，详细请查阅J2se API文档

static int	ROUND_CEILING            Rounding mode to round towards positive infinity. 向正无穷方向舍入
static int	ROUND_DOWN            Rounding mode to round towards zero. 向零方向舍入
static int	ROUND_FLOOR            Rounding mode to round towards negative infinity. 向负无穷方向舍入
static int	ROUND_HALF_DOWN            Rounding mode to round towards "nearest neighbor" unless both neighbors are equidistant, in which case round down. 向（距离）最近的一边舍入，除非两边（的距离）是相等,如果是这样，向下舍入, 例如1.55 保留一位小数结果为1.5
static int	ROUND_HALF_EVEN            Rounding mode to round towards the "nearest neighbor" unless both neighbors are equidistant, in which case, round towards the even neighbor. 向（距离）最近的一边舍入，除非两边（的距离）是相等,如果是这样，如果保留位数是奇数，使用ROUND_HALF_UP ，如果是偶数，使用ROUND_HALF_DOWN
static int	ROUND_HALF_UP            Rounding mode to round towards "nearest neighbor" unless both neighbors are equidistant, in which case round up. 向（距离）最近的一边舍入，除非两边（的距离）是相等,如果是这样，向上舍入, 1.55保留一位小数结果为1.6
static int	ROUND_UNNECESSARY            Rounding mode to assert that the requested operation has an exact result, hence no rounding is necessary. 计算结果是精确的，不需要舍入模式
static int	ROUND_UP            Rounding mode to round away from zero. 向远离0的方向舍入