Class com.google.common.collect.Sets

Added Methods
CopyOnWriteArraySet<E> newCopyOnWriteArraySet()	Creates an empty {@code CopyOnWriteArraySet} instance.
CopyOnWriteArraySet<E> newCopyOnWriteArraySet(Iterable<? extends E>)	Creates a {@code CopyOnWriteArraySet} instance containing the given elements.
NavigableSet<E> unmodifiableNavigableSet(NavigableSet<E>)	Returns an unmodifiable view of the specified navigable set.