Check if BigDecimal is an integer in Java
bigdecimal, java
Solution
Depending on the source/usage of your `BigDecimal` values it might be faster to check if the scale <= 0 first. If it is, then it's definitely an integer value in the mathematical sense. If it is >0, then it could still be an integer value and the more expensive test would be needed.
Problem
What is an efficient way of determining whether a `BigDecimal` is an integer value in the mathematical sense? At present I have the following code: ``` private boolean isIntegerValue(BigDecimal bd) { boolean ret; try { bd.toBigIntegerExact(); ret = true; } catch (ArithmeticException ex) { ret = false; } return ret; } ``` ... but would like to avoid the object creation overhead if possible. Previously I was using `bd.longValueExact()` which would avoid creating an object if the `BigDecimal` was using its compact representation internally, but obviously would fail if the value was too big to fit into a long.