// Create an empty set ImmutableSetAll of these examples create an ImmutableSet instance containing the given elements. The first example creates an empty set, while the second example creates a set with the elements "a", "b", and "c". The third example creates a set from an existing collection. ImmutableSet provides various methods for querying its elements, such as contains(), size(), and isEmpty(). It also provides methods for creating subsets of the set, such as headSet() and tailSet(), which return ImmutableSets containing elements from the beginning or end of the original set, respectively. Overall, ImmutableSet is a useful class for creating immutable sets with the added benefits of thread safety and additional functionality.set1 = ImmutableSet.of(); // Create a set with elements ImmutableSet set2 = ImmutableSet.of("a", "b", "c"); // Create a set from an existing collection Collection coll = Arrays.asList("d", "e", "f"); ImmutableSet set3 = ImmutableSet.copyOf(coll);