BigDecimal舍入模式 [英] BigDecimal Rounding modes

问题描述

我们正在将一些sybase代码替换为Java，并且对Rounding BigDecimal出现问题以匹配sybase返回的内容

We are replacing some sybase code to Java and having issue with Rounding BigDecimal to match what sybase returns

11.4443999999999999062083588796667754650115966796875-应该返回11.44

11.4443999999999999062083588796667754650115966796875 - Should return 11.44

和

35.9549999999999982946974341757595539093017578125-应该返回35.96

35.9549999999999982946974341757595539093017578125 - should return 35.96

我尝试了将比例设置为2的所有不同的舍入选项，但是没有一个都适用.最好的选择是什么?

I have tried all different rounding options with scale set to 2, but none works for both. What is the best option?

推荐答案

您将必须采取两步方法.首先使用RoundingMode.HALF_UP将比例缩放为3，然后将比例缩放为2:

You'll have to take a two-step approach. First round to scale 3, then to scale 2, using RoundingMode.HALF_UP:

BigDecimal value1 = new BigDecimal("11.4443999999999999062083588796667754650115966796875");      
BigDecimal value2 = new BigDecimal("35.9549999999999982946974341757595539093017578125"); 

BigDecimal rounded1 = value1.setScale(3, RoundingMode.HALF_UP); // 11.444
rounded1 = rounded1.setScale(2, RoundingMode.HALF_UP);          // 11.44

BigDecimal rounded2 = value2.setScale(3, RoundingMode.HALF_UP); // 35.955
rounded2 = rounded2.setScale(2, RoundingMode.HALF_UP);          // 35.96

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