Java Double Comparison [duplicate]

Answer 1

In the standard Java library there are no methods to handle your problem actually I suggest you to follow Joachim's link and use that library which is quite good for your needs, even though my suggestion would be to create an utils library in which you could add frequently used methods as the one you've stated in your question, as for different implementations of your problem you should consider looking into this :

Java double comparison epsilon

Feel free to ask out any other ambiguities

Answer 2

Guava has DoubleMath.fuzzyCompare().

Answer 3

You should abstain from any library that uses the naive "maximum absolute difference" approach (like Guava). As detailed in the Bruce Dawson's excellent article Comparing Floating Point Numbers, 2012 edition, it is highly error-prone as it only works for a very limited range of values. A much more robust approach is to use relative differences or ULPs for approximate comparisons.

The only library I know of that does implement a correct approximate comparison algorithm is apache.common.math.