如何在Java中识别Double中的BigDecimal

Question

I'm writing a financial application where i'm getting a value as string and need to check if the value is can be fit into double or BigDecimal without data loss.

What will be the best way to identify if the string value should be converted to a double or a BigDecimal?

Answer 1

If it's a financial value, you should pretty much always use BigDecimal - or use an integer with an implicit scaling value (eg store cents instead of dollars).

Floating binary point ( float , double ) is almost never appropriate for financial applications, as the values usually have precise decimal values which aren't exactly representable in floating binary point.

That doesn't mean double is a useless data type - it's fine for natural, continuous values such as distances. It's just not good for "artificial" discrete values which are typically measured specified in decimal.