| static <E extends @Nullable Object>Sets.SetView<E>
 | Sets. difference(Set<E> set1,
          Set<?> set2) | Returns an unmodifiable view of the difference of two sets. | 
| static <E extends @Nullable Object>Sets.SetView<E>
 | Sets. intersection(Set<E> set1,
            Set<?> set2) | Returns an unmodifiable view of the intersection of two sets. | 
| static <E extends @Nullable Object>Sets.SetView<E>
 | Sets. symmetricDifference(Set<? extends E> set1,
                   Set<? extends E> set2) | Returns an unmodifiable view of the symmetric difference of two sets. | 
| static <E extends @Nullable Object>Sets.SetView<E>
 | Sets. union(Set<? extends E> set1,
     Set<? extends E> set2) | Returns an unmodifiable view of the union of two sets. |