IEqualityComparer interface in Java

Question

More specifically I want an interface to compare objects which can be only compared for equality [e.g. complex numbers] but don\'t have total order on them. It should have [Not

Answer 1

The type you want is Guava's Equivalence. However, you may be disappointed, as in Java Collection and Map are fairly rigidly specified in terms of Object.equals, and you will not find implementations of those in Guava that use an alternate equivalence. You can, however, simulate that behavior a bit using myEquivalence.wrap(myObject).