The Set interface defines a set. It extends Collection and specifies the behavior of a collection that does not allow duplicate elements.
Therefore, the add( ) method returns false if an attempt is made to add duplicate elements to a set.
It does not have any additional methods of its own.
Set is a generic interface that has this declaration:
public interface Set<E> extends Collection<E>
Here, E specifies the type of objects that the set will hold. Set has methods only that is declared in Collection interface.
sub-type of set interface in java that extends Set interface.
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