BigDecimal通过setScale设置小数位数发生ArithmeticException_bigdecimal 0setscale 2位不生效-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_38025219/article/details/85122743

本文详细介绍了BigDecimal在Java中处理小数运算时的各种舍入模式，包括ROUND_CEILING、ROUND_DOWN、ROUND_FLOOR等，并通过实例展示了如何使用setScale方法设置保留小数位数及舍入方式。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

使用bigdecimal 保留小数位，出现以下错误
在这里插入图片描述

参数定义

ROUND_CEILING
Rounding mode to round towards positive infinity.
向正无穷方向舍入

ROUND_DOWN
Rounding mode to round towards zero.
向零方向舍入

ROUND_FLOOR
Rounding mode to round towards negative infinity.
向负无穷方向舍入

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

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

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

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

ROUND_UP
Rounding mode to round away from zero.
向远离0的方向舍入

解决办法:

BigDecimal bd = new BigDecimal("14141515E10");
bd = bd.setScale(2,BigDecimal.ROUND_HALF_UP);