T- the types of object this
public interface Equator<T>
It is the functional sibling of
Equator is to
Comparator is to
o1- the first object to be equated.
o2- the second object to be equated.
int hash(T o)
equals(Object)method to an Equator (and so must also delegate their
hashCode()method), or for implementations of
HashedMapthat use an Equator for the key objects.
o- the object to calculate the hash for.
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