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## com.google.common.collect
Class Sets.SetView<E>

    java.lang.Object
      java.util.AbstractCollection<E>
          java.util.AbstractSet<E>
              com.google.common.collect.Sets.SetView<E>

All Implemented Interfaces:
  Iterable<E>, Collection<E>, Set<E>

Enclosing class:
  Sets

    public abstract static class Sets.SetView<E>

extends AbstractSet<E>

An unmodifiable view of a set which may be backed by other sets; this view will change as the backing sets do. Contains methods to copy the data into a new set which will then remain stable. There is usually no reason to retain a reference of type `SetView`; typically, you either use it as a plain `Set`, or immediately invoke `immutableCopy()` or `copyInto(S)` and forget the `SetView` itself.

Since:
  2.0 (imported from Google Collections Library)

Method Summary
`
`<S extends Set<E>> S`
` | `copyInto(S set)` Copies the current contents of this set view into an existing set.
`ImmutableSet<E>` | `immutableCopy()` Returns an immutable copy of the current contents of this set view.

Methods inherited from class java.util.AbstractSet
`equals, hashCode, removeAll`

Methods inherited from class java.util.AbstractCollection
`add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, retainAll, size, toArray, toArray, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.Set
`add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, retainAll, size, toArray, toArray`

Method Detail

### immutableCopy

    public ImmutableSet<E> immutableCopy()

  Returns an immutable copy of the current contents of this set view. Does not support null elements.

  Warning: this may have unexpected results if a backing set of this view uses a nonstandard notion of equivalence, for example if it is a `TreeSet` using a comparator that is inconsistent with `Object.equals(Object)`.

### copyInto

    public <S extends Set<E>> S copyInto(S set)

  Copies the current contents of this set view into an existing set. This method has equivalent behavior to `set.addAll(this)`, assuming that all the sets involved are based on the same notion of equivalence.

  Returns:
    a reference to `set`, for convenience

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