Puzzled by the redefinition of the methods in java.util.Set

Hi all,
I don't understand why those methods in java.util.Set redefined since their counterparts have alrealdy been defined in java.util.Collection and java.util.Set extends java.util.Collection. I agree to redefine boolean add(Object o) because its contract has been modified, but what about the rest like
size() and iterator() ?
Thanks.

Hi all,
I don't understand why those methods in
in java.util.Set redefined since their counterparts
have alrealdy been defined in java.util.Collection
and java.util.Set extends java.util.Collection. I
agree to redefine boolean add(Object o) because its
contract has been modified, but what about the rest
like
size() and iterator() ?Completeness's sake?
~Cheers

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