BigDecimal - material decimal places

I have a BigDecimal value and I want to know if the number of decimal places it has is outside a boundary.

e.g. If BigDecimal is 123.456 and my decimal places boundary is 2 then this would be an error

However 123.450 with a boundary of 2 is ok as I consider the 0 to be immaterial for this test.

I am a bit unsure about BigDecimal with it's scale/unscaled implementation.

I have looked at scale() as an option but I think this could be wrong 开发者_开发问答for my case where trailing zeros are concerned.

Does anyone know the correct way to test for this?

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BigDecimal has stripTrailingZeros(). After that scale() will do what you want.

OR you could use BigDecimal.setScale(2, RoundingMode.UNNECESSARY) which will throw an Exception if there are non-zeros. To me this looks a bit inefficient in the common case. But if you would throw an exception anyway it might be useful.