Method addAll

lib/java/util/Set.java:58–58

Adds the objects in the specified collection which do not exist yet in this set. @param collection the collection of objects. @return true if this set is modified, false otherwise. @throws UnsupportedOperationException when adding to this set is not supported.

(Collection<? extends E> collection)

     *             when an object cannot be added to this set.
     */
    public boolean addAll(Collection<? extends E> collection);

    /**
     * Removes all elements from this set, leaving it empty.