Java 如何在不舍入的情况下截断 BigDecimal
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How to truncate a BigDecimal without rounding
提问by JJ180
After a series of calculations in my code, I have a BigDecimalwith value 0.01954
在我的代码中经过一系列计算后，我有了一个BigDecimal值0.01954
I then need to multiply this BigDecimalby 100and I wish the calculated value to be 1.95
那么我就需要这个相乘BigDecimal的100，我希望计算出的值是1.95
I do not wish to perform any rounding up or down, I just want any values beyond two decimal places to be truncated
我不想执行任何向上或向下舍入，我只想截断小数点后两位以上的任何值
I tried setting scale to 2, but then I got an ArithmeticExceptionsaying rounding is necessary. How can I set scale without specifying rounding?
我尝试将比例设置为 2，但后来我得到了一个ArithmeticException说法，四舍五入是必要的。如何在不指定舍入的情况下设置比例？
采纳答案by GriffeyDog
Use either RoundingMode.DOWNor RoundingMode.FLOOR.
使用RoundingMode.DOWN或RoundingMode.FLOOR。
BigDecimal newValue = myBigDecimal.setScale(2, RoundingMode.DOWN);
回答by user1676075
Use the setScale override that includes RoundingMode:
使用包含 RoundingMode 的 setScale 覆盖：
value.setScale(2, RoundingMode.DOWN);
