Answer Posted / edward sudhaharchennai

Unlike other implementations of the collection interface,
implementation of the Set intrface do not allow duplicate
elements. This also means that a set can contain at most
one null value. The set interface does not define any new
methods, and its add() and addAll() methods will not store
duplicates. If an element is not currently in the set, two
consecutive calls to the add() method to insert the element
will first return true then false...........

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