Why Java does not support Equality comparison on the Lines of Comparator?

Java provides way to define comparison of object outside scope Object using `Comparator`. Now my questions is why java does not allow do same for equals() and hashcode(). Now each collection `contains()` method can easily use this external equality provider to check objects are equal.
Currently the only way to do this is to create a wrapper for keys/elements. Trove4j supports custom HashingStrategies. trove4j.sourceforge.net/javadocs/gnu/trove/strategy/…

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