Question

Are there any java libraries for doing double comparison?
e.g.

public static boolean greaterThanOrEqual(double a, double b, double epsilon){
     return a - b > -epsilon;
}

Every project I start I end up re-implementing this and copy-pasting code and test.

NB a good example of why its better to use 3rd party JARs is that IBM recommend the following:

“If you don’t know the scale of the underlying measurements, using the
test “abs(a/b – 1) < epsilon” is likely to be more robust than simply
comparing the difference”

I doubt many people would have thought of this and illustrates that even simple code can be sub-optimal.

Answer 1

Guava has DoubleMath.fuzzyCompare().