Package com.google.common.collect

Class ImmutableSortedSet<E>

java.lang.Object

java.util.AbstractCollection<E>

com.google.common.collect.ImmutableCollection<E>

com.google.common.collect.ImmutableSet<E>

com.google.common.collect.ImmutableSortedSetFauxverideShim<E>

com.google.common.collect.ImmutableSortedSet<E>

All Implemented Interfaces:

SortedIterable<E>, java.io.Serializable, java.lang.Iterable<E>, java.util.Collection<E>, java.util.NavigableSet<E>, java.util.Set<E>, java.util.SortedSet<E>

Direct Known Subclasses:

ContiguousSet, DescendingImmutableSortedSet, ImmutableRangeSet.AsSet, RegularImmutableSortedSet

public abstract class ImmutableSortedSet<E>
extends ImmutableSortedSetFauxverideShim<E>
implements java.util.NavigableSet<E>, SortedIterable<E>

A NavigableSet whose contents will never change, with many other important properties detailed at ImmutableCollection.

Warning: as with any sorted collection, you are strongly advised not to use a Comparator or Comparable type whose comparison behavior is inconsistent with equals. That is, a.compareTo(b) or comparator.compare(a, b) should equal zero if and only if a.equals(b). If this advice is not followed, the resulting collection will not correctly obey its specification.

See the Guava User Guide article on immutable collections.

Since:

2.0 (implements NavigableSet since 12.0)

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ImmutableSortedSet.Builder<E>	A builder for creating immutable sorted set instances, especially public static final sets ("constant sets"), with a given comparator.
private static class	ImmutableSortedSet.SerializedForm<E>

Nested classes/interfaces inherited from class com.google.common.collect.ImmutableSet

ImmutableSet.Indexed<E>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) java.util.Comparator<? super E>	comparator
(package private) ImmutableSortedSet<E>	descendingSet
(package private) static int	SPLITERATOR_CHARACTERISTICS

Fields inherited from class com.google.common.collect.ImmutableSet

HASH_FLOODING_FPP, MAX_RUN_MULTIPLIER, MAX_TABLE_SIZE

Constructor Summary

Constructors

Constructor	Description
ImmutableSortedSet(java.util.Comparator<? super E> comparator)

Method Summary

Modifier and Type	Method	Description
E	ceiling(E e)
java.util.Comparator<? super E>	comparator()	Returns the comparator that orders the elements, which is Ordering.natural() when the natural ordering of the elements is used.
(package private) static <E> ImmutableSortedSet<E>	construct(java.util.Comparator<? super E> comparator, int n, E... contents)	Constructs an ImmutableSortedSet from the first n elements of contents.
static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E>	copyOf(E[] elements)	Returns an immutable sorted set containing the given elements sorted by their natural ordering.
static <E> ImmutableSortedSet<E>	copyOf(java.lang.Iterable<? extends E> elements)	Returns an immutable sorted set containing the given elements sorted by their natural ordering.
static <E> ImmutableSortedSet<E>	copyOf(java.util.Collection<? extends E> elements)	Returns an immutable sorted set containing the given elements sorted by their natural ordering.
static <E> ImmutableSortedSet<E>	copyOf(java.util.Comparator<? super E> comparator, java.lang.Iterable<? extends E> elements)	Returns an immutable sorted set containing the given elements sorted by the given Comparator.
static <E> ImmutableSortedSet<E>	copyOf(java.util.Comparator<? super E> comparator, java.util.Collection<? extends E> elements)	Returns an immutable sorted set containing the given elements sorted by the given Comparator.
static <E> ImmutableSortedSet<E>	copyOf(java.util.Comparator<? super E> comparator, java.util.Iterator<? extends E> elements)	Returns an immutable sorted set containing the given elements sorted by the given Comparator.
static <E> ImmutableSortedSet<E>	copyOf(java.util.Iterator<? extends E> elements)	Returns an immutable sorted set containing the given elements sorted by their natural ordering.
static <E> ImmutableSortedSet<E>	copyOfSorted(java.util.SortedSet<E> sortedSet)	Returns an immutable sorted set containing the elements of a sorted set, sorted by the same Comparator.
(package private) abstract ImmutableSortedSet<E>	createDescendingSet()
abstract UnmodifiableIterator<E>	descendingIterator()
ImmutableSortedSet<E>	descendingSet()
(package private) static <E> RegularImmutableSortedSet<E>	emptySet(java.util.Comparator<? super E> comparator)
E	first()
E	floor(E e)
ImmutableSortedSet<E>	headSet(E toElement)
ImmutableSortedSet<E>	headSet(E toElement, boolean inclusive)
(package private) abstract ImmutableSortedSet<E>	headSetImpl(E toElement, boolean inclusive)
E	higher(E e)
(package private) abstract int	indexOf(java.lang.Object target)	Returns the position of an element within the set, or -1 if not present.
abstract UnmodifiableIterator<E>	iterator()	Returns an unmodifiable iterator across the elements in this collection.
E	last()
E	lower(E e)
static <E extends java.lang.Comparable<?>> ImmutableSortedSet.Builder<E>	naturalOrder()	Returns a builder that creates immutable sorted sets whose elements are ordered by their natural ordering.
static <E> ImmutableSortedSet<E>	of()	Returns the empty immutable sorted set.
static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E>	of(E element)	Returns an immutable sorted set containing a single element.
static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E>	of(E e1, E e2)	Returns an immutable sorted set containing the given elements sorted by their natural ordering.
static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E>	of(E e1, E e2, E e3)	Returns an immutable sorted set containing the given elements sorted by their natural ordering.
static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E>	of(E e1, E e2, E e3, E e4)	Returns an immutable sorted set containing the given elements sorted by their natural ordering.
static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E>	of(E e1, E e2, E e3, E e4, E e5)	Returns an immutable sorted set containing the given elements sorted by their natural ordering.
static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E>	of(E e1, E e2, E e3, E e4, E e5, E e6, E... remaining)	Returns an immutable sorted set containing the given elements sorted by their natural ordering.
static <E> ImmutableSortedSet.Builder<E>	orderedBy(java.util.Comparator<E> comparator)	Returns a builder that creates immutable sorted sets with an explicit comparator.
E	pollFirst()	Deprecated. Unsupported operation.
E	pollLast()	Deprecated. Unsupported operation.
private void	readObject(java.io.ObjectInputStream unused)
static <E extends java.lang.Comparable<?>> ImmutableSortedSet.Builder<E>	reverseOrder()	Returns a builder that creates immutable sorted sets whose elements are ordered by the reverse of their natural ordering.
java.util.Spliterator<E>	spliterator()
ImmutableSortedSet<E>	subSet(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)
ImmutableSortedSet<E>	subSet(E fromElement, E toElement)
(package private) abstract ImmutableSortedSet<E>	subSetImpl(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)
ImmutableSortedSet<E>	tailSet(E fromElement)
ImmutableSortedSet<E>	tailSet(E fromElement, boolean inclusive)
(package private) abstract ImmutableSortedSet<E>	tailSetImpl(E fromElement, boolean inclusive)
static <E> java.util.stream.Collector<E,?,ImmutableSortedSet<E>>	toImmutableSortedSet(java.util.Comparator<? super E> comparator)	Returns a Collector that accumulates the input elements into a new ImmutableSortedSet, ordered by the specified comparator.
(package private) int	unsafeCompare(java.lang.Object a, java.lang.Object b)
(package private) static int	unsafeCompare(java.util.Comparator<?> comparator, java.lang.Object a, java.lang.Object b)
(package private) java.lang.Object	writeReplace()

Methods inherited from class com.google.common.collect.ImmutableSortedSetFauxverideShim

builder, builderWithExpectedSize, copyOf, of, of, of, of, of, of, toImmutableSet

Methods inherited from class com.google.common.collect.ImmutableSet

asList, chooseTableSize, createAsList, equals, hashCode, hashFloodingDetected, isHashCodeFast, rebuildHashTable

Methods inherited from class com.google.common.collect.ImmutableCollection

add, addAll, clear, contains, copyIntoArray, internalArray, internalArrayEnd, internalArrayStart, isPartialView, remove, removeAll, removeIf, retainAll, toArray, toArray

Methods inherited from class java.util.AbstractCollection

containsAll, isEmpty, size, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, remove, removeAll, retainAll, size, toArray, toArray

Field Detail

SPLITERATOR_CHARACTERISTICS

static final int SPLITERATOR_CHARACTERISTICS

See Also:

Constant Field Values

comparator

final transient java.util.Comparator<? super E> comparator

descendingSet

transient ImmutableSortedSet<E> descendingSet

Constructor Detail

ImmutableSortedSet

ImmutableSortedSet(java.util.Comparator<? super E> comparator)

Method Detail

toImmutableSortedSet

public static <E> java.util.stream.Collector<E,?,ImmutableSortedSet<E>> toImmutableSortedSet(java.util.Comparator<? super E> comparator)

Returns a Collector that accumulates the input elements into a new ImmutableSortedSet, ordered by the specified comparator.

If the elements contain duplicates (according to the comparator), only the first duplicate in encounter order will appear in the result.

Since:

21.0

emptySet

static <E> RegularImmutableSortedSet<E> emptySet(java.util.Comparator<? super E> comparator)

of

public static <E> ImmutableSortedSet<E> of()

Returns the empty immutable sorted set.

of

public static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E> of(E element)

Returns an immutable sorted set containing a single element.

of

public static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E> of(E e1,
                                                                                   E e2)

Returns an immutable sorted set containing the given elements sorted by their natural ordering. When multiple elements are equivalent according to Comparable.compareTo(T), only the first one specified is included.

Throws:

java.lang.NullPointerException - if any element is null

of

public static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E> of(E e1,
                                                                                   E e2,
                                                                                   E e3)

Returns an immutable sorted set containing the given elements sorted by their natural ordering. When multiple elements are equivalent according to Comparable.compareTo(T), only the first one specified is included.

Throws:

java.lang.NullPointerException - if any element is null

of

public static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E> of(E e1,
                                                                                   E e2,
                                                                                   E e3,
                                                                                   E e4)

Returns an immutable sorted set containing the given elements sorted by their natural ordering. When multiple elements are equivalent according to Comparable.compareTo(T), only the first one specified is included.

Throws:

java.lang.NullPointerException - if any element is null

of

public static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E> of(E e1,
                                                                                   E e2,
                                                                                   E e3,
                                                                                   E e4,
                                                                                   E e5)

Returns an immutable sorted set containing the given elements sorted by their natural ordering. When multiple elements are equivalent according to Comparable.compareTo(T), only the first one specified is included.

Throws:

java.lang.NullPointerException - if any element is null

of

public static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E> of(E e1,
                                                                                   E e2,
                                                                                   E e3,
                                                                                   E e4,
                                                                                   E e5,
                                                                                   E e6,
                                                                                   E... remaining)

Returns an immutable sorted set containing the given elements sorted by their natural ordering. When multiple elements are equivalent according to Comparable.compareTo(T), only the first one specified is included.

Throws:

java.lang.NullPointerException - if any element is null

Since:

3.0 (source-compatible since 2.0)

copyOf

public static <E extends java.lang.Comparable<? super E>> ImmutableSortedSet<E> copyOf(E[] elements)

Returns an immutable sorted set containing the given elements sorted by their natural ordering. When multiple elements are equivalent according to Comparable.compareTo(T), only the first one specified is included.

Throws:

java.lang.NullPointerException - if any of elements is null

Since:

3.0

copyOf

public static <E> ImmutableSortedSet<E> copyOf(java.lang.Iterable<? extends E> elements)

Returns an immutable sorted set containing the given elements sorted by their natural ordering. When multiple elements are equivalent according to compareTo(), only the first one specified is included. To create a copy of a SortedSet that preserves the comparator, call copyOfSorted(java.util.SortedSet<E>) instead. This method iterates over elements at most once.

Note that if s is a Set<String>, then ImmutableSortedSet.copyOf(s) returns an ImmutableSortedSet<String> containing each of the strings in s, while ImmutableSortedSet.of(s) returns an ImmutableSortedSet<Set<String>> containing one element (the given set itself).

Despite the method name, this method attempts to avoid actually copying the data when it is safe to do so. The exact circumstances under which a copy will or will not be performed are undocumented and subject to change.

This method is not type-safe, as it may be called on elements that are not mutually comparable.

Throws:

java.lang.ClassCastException - if the elements are not mutually comparable

java.lang.NullPointerException - if any of elements is null

copyOf

public static <E> ImmutableSortedSet<E> copyOf(java.util.Collection<? extends E> elements)

Returns an immutable sorted set containing the given elements sorted by their natural ordering. When multiple elements are equivalent according to compareTo(), only the first one specified is included. To create a copy of a SortedSet that preserves the comparator, call copyOfSorted(java.util.SortedSet<E>) instead. This method iterates over elements at most once.

Note that if s is a Set<String>, then ImmutableSortedSet.copyOf(s) returns an ImmutableSortedSet<String> containing each of the strings in s, while ImmutableSortedSet.of(s) returns an ImmutableSortedSet<Set<String>> containing one element (the given set itself).

Note: Despite what the method name suggests, if elements is an ImmutableSortedSet, it may be returned instead of a copy.

This method is not type-safe, as it may be called on elements that are not mutually comparable.

This method is safe to use even when elements is a synchronized or concurrent collection that is currently being modified by another thread.

Throws:

java.lang.ClassCastException - if the elements are not mutually comparable

java.lang.NullPointerException - if any of elements is null

Since:

7.0 (source-compatible since 2.0)

copyOf

public static <E> ImmutableSortedSet<E> copyOf(java.util.Iterator<? extends E> elements)

Returns an immutable sorted set containing the given elements sorted by their natural ordering. When multiple elements are equivalent according to compareTo(), only the first one specified is included.

This method is not type-safe, as it may be called on elements that are not mutually comparable.

Throws:

java.lang.ClassCastException - if the elements are not mutually comparable

java.lang.NullPointerException - if any of elements is null

copyOf

public static <E> ImmutableSortedSet<E> copyOf(java.util.Comparator<? super E> comparator,
                                               java.util.Iterator<? extends E> elements)

Returns an immutable sorted set containing the given elements sorted by the given Comparator. When multiple elements are equivalent according to compareTo(), only the first one specified is included.

Throws:

java.lang.NullPointerException - if comparator or any of elements is null

copyOf

public static <E> ImmutableSortedSet<E> copyOf(java.util.Comparator<? super E> comparator,
                                               java.lang.Iterable<? extends E> elements)

Returns an immutable sorted set containing the given elements sorted by the given Comparator. When multiple elements are equivalent according to compare(), only the first one specified is included. This method iterates over elements at most once.

Despite the method name, this method attempts to avoid actually copying the data when it is safe to do so. The exact circumstances under which a copy will or will not be performed are undocumented and subject to change.

Throws:

java.lang.NullPointerException - if comparator or any of elements is null

copyOf

public static <E> ImmutableSortedSet<E> copyOf(java.util.Comparator<? super E> comparator,
                                               java.util.Collection<? extends E> elements)

Returns an immutable sorted set containing the given elements sorted by the given Comparator. When multiple elements are equivalent according to compareTo(), only the first one specified is included.

Despite the method name, this method attempts to avoid actually copying the data when it is safe to do so. The exact circumstances under which a copy will or will not be performed are undocumented and subject to change.

This method is safe to use even when elements is a synchronized or concurrent collection that is currently being modified by another thread.

Throws:

java.lang.NullPointerException - if comparator or any of elements is null

Since:

7.0 (source-compatible since 2.0)

copyOfSorted

public static <E> ImmutableSortedSet<E> copyOfSorted(java.util.SortedSet<E> sortedSet)

Returns an immutable sorted set containing the elements of a sorted set, sorted by the same Comparator. That behavior differs from copyOf(Iterable), which always uses the natural ordering of the elements.

Despite the method name, this method attempts to avoid actually copying the data when it is safe to do so. The exact circumstances under which a copy will or will not be performed are undocumented and subject to change.

This method is safe to use even when sortedSet is a synchronized or concurrent collection that is currently being modified by another thread.

Throws:

java.lang.NullPointerException - if sortedSet or any of its elements is null

construct

static <E> ImmutableSortedSet<E> construct(java.util.Comparator<? super E> comparator,
                                           int n,
                                           E... contents)

Constructs an ImmutableSortedSet from the first n elements of contents. If k is the size of the returned ImmutableSortedSet, then the sorted unique elements are in the first k positions of contents, and contents[i] == null for k <= i < n.

If k == contents.length, then contents may no longer be safe for modification.

Throws:

java.lang.NullPointerException - if any of the first n elements of contents is null

orderedBy

public static <E> ImmutableSortedSet.Builder<E> orderedBy(java.util.Comparator<E> comparator)

Returns a builder that creates immutable sorted sets with an explicit comparator. If the comparator has a more general type than the set being generated, such as creating a SortedSet<Integer> with a Comparator<Number>, use the ImmutableSortedSet.Builder constructor instead.

Throws:

java.lang.NullPointerException - if comparator is null

reverseOrder

public static <E extends java.lang.Comparable<?>> ImmutableSortedSet.Builder<E> reverseOrder()

Returns a builder that creates immutable sorted sets whose elements are ordered by the reverse of their natural ordering.

naturalOrder

public static <E extends java.lang.Comparable<?>> ImmutableSortedSet.Builder<E> naturalOrder()

Returns a builder that creates immutable sorted sets whose elements are ordered by their natural ordering. The sorted sets use Ordering.natural() as the comparator. This method provides more type-safety than ImmutableSortedSetFauxverideShim.builder(), as it can be called only for classes that implement Comparable.

unsafeCompare

int unsafeCompare(java.lang.Object a,
                  java.lang.Object b)

unsafeCompare

static int unsafeCompare(java.util.Comparator<?> comparator,
                         java.lang.Object a,
                         java.lang.Object b)

comparator

public java.util.Comparator<? super E> comparator()

Returns the comparator that orders the elements, which is Ordering.natural() when the natural ordering of the elements is used. Note that its behavior is not consistent with SortedSet.comparator(), which returns null to indicate natural ordering.

Specified by:

comparator in interface SortedIterable<E>

Specified by:

comparator in interface java.util.SortedSet<E>

iterator

public abstract UnmodifiableIterator<E> iterator()

Description copied from class: ImmutableCollection

Returns an unmodifiable iterator across the elements in this collection.

Specified by:

iterator in interface java.util.Collection<E>

Specified by:

iterator in interface java.lang.Iterable<E>

Specified by:

iterator in interface java.util.NavigableSet<E>

Specified by:

iterator in interface java.util.Set<E>

Specified by:

iterator in interface SortedIterable<E>

Specified by:

iterator in class ImmutableSet<E>

headSet

public ImmutableSortedSet<E> headSet(E toElement)

This method returns a serializable ImmutableSortedSet.

The SortedSet.headSet(E) documentation states that a subset of a subset throws an IllegalArgumentException if passed a toElement greater than an earlier toElement. However, this method doesn't throw an exception in that situation, but instead keeps the original toElement.

Specified by:

headSet in interface java.util.NavigableSet<E>

Specified by:

headSet in interface java.util.SortedSet<E>

headSet

public ImmutableSortedSet<E> headSet(E toElement,
                                     boolean inclusive)

Specified by:

headSet in interface java.util.NavigableSet<E>

Since:

12.0

subSet

public ImmutableSortedSet<E> subSet(E fromElement,
                                    E toElement)

This method returns a serializable ImmutableSortedSet.

The SortedSet.subSet(E, E) documentation states that a subset of a subset throws an IllegalArgumentException if passed a fromElement smaller than an earlier fromElement. However, this method doesn't throw an exception in that situation, but instead keeps the original fromElement. Similarly, this method keeps the original toElement, instead of throwing an exception, if passed a toElement greater than an earlier toElement.

Specified by:

subSet in interface java.util.NavigableSet<E>

Specified by:

subSet in interface java.util.SortedSet<E>

subSet

public ImmutableSortedSet<E> subSet(E fromElement,
                                    boolean fromInclusive,
                                    E toElement,
                                    boolean toInclusive)

Specified by:

subSet in interface java.util.NavigableSet<E>

Since:

12.0

tailSet

public ImmutableSortedSet<E> tailSet(E fromElement)

This method returns a serializable ImmutableSortedSet.

The SortedSet.tailSet(E) documentation states that a subset of a subset throws an IllegalArgumentException if passed a fromElement smaller than an earlier fromElement. However, this method doesn't throw an exception in that situation, but instead keeps the original fromElement.

Specified by:

tailSet in interface java.util.NavigableSet<E>

Specified by:

tailSet in interface java.util.SortedSet<E>

tailSet

public ImmutableSortedSet<E> tailSet(E fromElement,
                                     boolean inclusive)

Specified by:

tailSet in interface java.util.NavigableSet<E>

Since:

12.0

headSetImpl

abstract ImmutableSortedSet<E> headSetImpl(E toElement,
                                           boolean inclusive)

subSetImpl

abstract ImmutableSortedSet<E> subSetImpl(E fromElement,
                                          boolean fromInclusive,
                                          E toElement,
                                          boolean toInclusive)

tailSetImpl

abstract ImmutableSortedSet<E> tailSetImpl(E fromElement,
                                           boolean inclusive)

lower

public E lower(E e)

Specified by:

lower in interface java.util.NavigableSet<E>

Since:

12.0

floor

public E floor(E e)

Specified by:

floor in interface java.util.NavigableSet<E>

Since:

12.0

ceiling

public E ceiling(E e)

Specified by:

ceiling in interface java.util.NavigableSet<E>

Since:

12.0

higher

public E higher(E e)

Specified by:

higher in interface java.util.NavigableSet<E>

Since:

12.0

first

public E first()

Specified by:

first in interface java.util.SortedSet<E>

last

public E last()

Specified by:

last in interface java.util.SortedSet<E>

pollFirst

@Deprecated
public final E pollFirst()

Deprecated.

Unsupported operation.

Guaranteed to throw an exception and leave the set unmodified.

Specified by:

pollFirst in interface java.util.NavigableSet<E>

Throws:

java.lang.UnsupportedOperationException - always

Since:

12.0

pollLast

@Deprecated
public final E pollLast()

Deprecated.

Unsupported operation.

Guaranteed to throw an exception and leave the set unmodified.

Specified by:

pollLast in interface java.util.NavigableSet<E>

Throws:

java.lang.UnsupportedOperationException - always

Since:

12.0

descendingSet

public ImmutableSortedSet<E> descendingSet()

Specified by:

descendingSet in interface java.util.NavigableSet<E>

Since:

12.0

createDescendingSet

abstract ImmutableSortedSet<E> createDescendingSet()

spliterator

public java.util.Spliterator<E> spliterator()

Specified by:

spliterator in interface java.util.Collection<E>

Specified by:

spliterator in interface java.lang.Iterable<E>

Specified by:

spliterator in interface java.util.Set<E>

Specified by:

spliterator in interface java.util.SortedSet<E>

Overrides:

spliterator in class ImmutableCollection<E>

descendingIterator

public abstract UnmodifiableIterator<E> descendingIterator()

Specified by:

descendingIterator in interface java.util.NavigableSet<E>

Since:

12.0

indexOf

abstract int indexOf(java.lang.Object target)

Returns the position of an element within the set, or -1 if not present.

readObject

private void readObject(java.io.ObjectInputStream unused)
                 throws java.io.InvalidObjectException

Throws:

java.io.InvalidObjectException

writeReplace

java.lang.Object writeReplace()

Overrides:

writeReplace in class ImmutableSet<E>