A Double（Java）中的小数位数 [英] How many decimal Places in A Double (Java)

问题描述

在java中是否有任何内置函数告诉我double中有多少小数位。例如：

Is there any in built function in java to tell me how many decimal places in a double. For example:

101.13 = 2
101.130 = 3
1.100 = 3
1.1 = 1
-3.2322 = 4 etc.

我很乐意首先转换为另一种类型需要，我已经考虑过转换为bigdecimal而没有运气。

I am happy to convert to another type first if needed, I have looked at converting to bigdecimal first with no luck.

推荐答案

否。

1.100和1.1是完全相同的值（它们在 double 中表示完全相同）。

1.100 and 1.1 are exactly the same value (they are represented exactly the same bit-for-bit in a double).

因此，您无法从 double 获得此类信息。

Therefore you can't ever get that kind of information from a double.

你可以做的唯一事情是获得将十进制数解析为相同的 double 值所需的最小小数位数。这就像调用 Double.toString（）一样简单，并检查它有多少位数。

The only thing you can do is to get the minimum number of decimal digits necessary for a decimal number to be parsed into the same double value. And that is as easy as calling Double.toString() and checking how many decimal digits there are.

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