Public Method addAll

abstract boolean addAll(Collection c)

_INSERT_METHOD_SIGNATURE_HERE_

Adds all of the elements in the specified collection to this set if they're not already present (optional operation).

If the specified collection is also a set, the addAll operation effectively modifies this set so that its value is the union of the two sets. The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress.