Package com.google.common.collect

Class ImmutableList<E>

java.lang.Object

java.util.AbstractCollection<E>

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

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

All Implemented Interfaces:

Serializable, Iterable<E>, Collection<E>, List<E>, RandomAccess

@GwtCompatible(serializable=true,
               emulated=true)
public abstract class ImmutableList<E>
extends ImmutableCollection<E>
implements List<E>, RandomAccess

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

See the Guava User Guide article on immutable collections.

Since:

2.0

Author:

Kevin Bourrillion

See Also:

ImmutableMap, ImmutableSet, Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ImmutableList.Builder<E>	A builder for creating immutable list instances, especially public static final lists ("constant lists").

Method Summary

Modifier and Type	Method	Description
void	add(int index, E element)	Deprecated. Unsupported operation.
boolean	addAll(int index, Collection<? extends E> newElements)	Deprecated. Unsupported operation.
ImmutableList<E>	asList()	Deprecated. There is no reason to use this; it always returns this.
static <E> ImmutableList.Builder<E>	builder()	Returns a new builder.
static <E> ImmutableList.Builder<E>	builderWithExpectedSize(int expectedSize)	Returns a new builder, expecting the specified number of elements to be added.
boolean	contains(Object object)
static <E> ImmutableList<E>	copyOf(E[] elements)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	copyOf(Iterable<? extends E> elements)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	copyOf(Collection<? extends E> elements)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	copyOf(Iterator<? extends E> elements)	Returns an immutable list containing the given elements, in order.
boolean	equals(Object obj)
int	hashCode()
int	indexOf(Object object)
UnmodifiableIterator<E>	iterator()	Returns an unmodifiable iterator across the elements in this collection.
int	lastIndexOf(Object object)
UnmodifiableListIterator<E>	listIterator()
UnmodifiableListIterator<E>	listIterator(int index)
static <E> ImmutableList<E>	of()	Returns the empty immutable list.
static <E> ImmutableList<E>	of(E e1)	Returns an immutable list containing a single element.
static <E> ImmutableList<E>	of(E e1, E e2)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3, E e4)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3, E e4, E e5)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3, E e4, E e5, E e6)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3, E e4, E e5, E e6, E e7)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9, E e10)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9, E e10, E e11)	Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9, E e10, E e11, E e12, E... others)	Returns an immutable list containing the given elements, in order.
E	remove(int index)	Deprecated. Unsupported operation.
ImmutableList<E>	reverse()	Returns a view of this immutable list in reverse order.
E	set(int index, E element)	Deprecated. Unsupported operation.
static <E extends Comparable<? super E>> ImmutableList<E>	sortedCopyOf(Iterable<? extends E> elements)	Returns an immutable list containing the given elements, sorted according to their natural order.
static <E> ImmutableList<E>	sortedCopyOf(Comparator<? super E> comparator, Iterable<? extends E> elements)	Returns an immutable list containing the given elements, in sorted order relative to the specified comparator.
ImmutableList<E>	subList(int fromIndex, int toIndex)	Returns an immutable list of the elements between the specified fromIndex, inclusive, and toIndex, exclusive.
static <E> Collector<E,?,ImmutableList<E>>	toImmutableList()	Returns a Collector that accumulates the input elements into a new ImmutableList, in encounter order.

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

add, addAll, clear, remove, removeAll, retainAll, spliterator, 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.List

add, addAll, clear, containsAll, get, isEmpty, remove, removeAll, replaceAll, retainAll, size, sort, spliterator, toArray, toArray

Method Detail

toImmutableList

public static <E> Collector<E,?,ImmutableList<E>> toImmutableList()

Returns a Collector that accumulates the input elements into a new ImmutableList, in encounter order.

Since:

33.2.0 (available since 21.0 in guava-jre)

of

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

Returns the empty immutable list. This list behaves and performs comparably to Collections.emptyList(), and is preferable mainly for consistency and maintainability of your code.

Performance note: the instance returned is a singleton.

of

public static <E> ImmutableList<E> of(E e1)

Returns an immutable list containing a single element. This list behaves and performs comparably to Collections.singletonList(T), but will not accept a null element. It is preferable mainly for consistency and maintainability of your code.

Throws:

NullPointerException - if the element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3,
                                      E e4)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3,
                                      E e4,
                                      E e5)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3,
                                      E e4,
                                      E e5,
                                      E e6)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3,
                                      E e4,
                                      E e5,
                                      E e6,
                                      E e7)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3,
                                      E e4,
                                      E e5,
                                      E e6,
                                      E e7,
                                      E e8)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3,
                                      E e4,
                                      E e5,
                                      E e6,
                                      E e7,
                                      E e8,
                                      E e9)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3,
                                      E e4,
                                      E e5,
                                      E e6,
                                      E e7,
                                      E e8,
                                      E e9,
                                      E e10)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3,
                                      E e4,
                                      E e5,
                                      E e6,
                                      E e7,
                                      E e8,
                                      E e9,
                                      E e10,
                                      E e11)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if any element is null

of

@SafeVarargs
public static <E> ImmutableList<E> of(E e1,
                                      E e2,
                                      E e3,
                                      E e4,
                                      E e5,
                                      E e6,
                                      E e7,
                                      E e8,
                                      E e9,
                                      E e10,
                                      E e11,
                                      E e12,
                                      E... others)

Returns an immutable list containing the given elements, in order.

The array others must not be longer than Integer.MAX_VALUE - 12.

Throws:

NullPointerException - if any element is null

Since:

3.0 (source-compatible since 2.0)

copyOf

public static <E> ImmutableList<E> copyOf(Iterable<? extends E> elements)

Returns an immutable list containing the given elements, in order. If elements is a Collection, this method behaves exactly as copyOf(Collection); otherwise, it behaves exactly as copyOf(elements.iterator().

Throws:

NullPointerException - if elements contains a null element

copyOf

public static <E> ImmutableList<E> copyOf(Collection<? extends E> elements)

Returns an immutable list containing the given elements, in order.

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.

Note that if list is a List<String>, then ImmutableList.copyOf(list) returns an ImmutableList<String> containing each of the strings in list, while ImmutableList.of(list) returns an ImmutableList<List<String>> containing one element (the given list itself).

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

Throws:

NullPointerException - if elements contains a null element

copyOf

public static <E> ImmutableList<E> copyOf(Iterator<? extends E> elements)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if elements contains a null element

copyOf

public static <E> ImmutableList<E> copyOf(E[] elements)

Returns an immutable list containing the given elements, in order.

Throws:

NullPointerException - if elements contains a null element

Since:

3.0

sortedCopyOf

public static <E extends Comparable<? super E>> ImmutableList<E> sortedCopyOf(Iterable<? extends E> elements)

Returns an immutable list containing the given elements, sorted according to their natural order. The sorting algorithm used is stable, so elements that compare as equal will stay in the order in which they appear in the input.

If your data has no duplicates, or you wish to deduplicate elements, use ImmutableSortedSet.copyOf(elements); if you want a List you can use its asList() view.

Java 8+ users: If you want to convert a Stream to a sorted ImmutableList, use stream.sorted().collect(toImmutableList()).

Throws:

NullPointerException - if any element in the input is null

Since:

21.0

sortedCopyOf

public static <E> ImmutableList<E> sortedCopyOf(Comparator<? super E> comparator,
                                                Iterable<? extends E> elements)

Returns an immutable list containing the given elements, in sorted order relative to the specified comparator. The sorting algorithm used is stable, so elements that compare as equal will stay in the order in which they appear in the input.

If your data has no duplicates, or you wish to deduplicate elements, use ImmutableSortedSet.copyOf(comparator, elements); if you want a List you can use its asList() view.

Java 8+ users: If you want to convert a Stream to a sorted ImmutableList, use stream.sorted(comparator).collect(toImmutableList()).

Throws:

NullPointerException - if any element in the input is null

Since:

21.0

iterator

public UnmodifiableIterator<E> iterator()

Description copied from class: ImmutableCollection

Returns an unmodifiable iterator across the elements in this collection.

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in interface List<E>

Specified by:

iterator in class ImmutableCollection<E>

listIterator

public UnmodifiableListIterator<E> listIterator()

Specified by:

listIterator in interface List<E>

listIterator

public UnmodifiableListIterator<E> listIterator(int index)

Specified by:

listIterator in interface List<E>

indexOf

public int indexOf(@CheckForNull
                   Object object)

Specified by:

indexOf in interface List<E>

lastIndexOf

public int lastIndexOf(@CheckForNull
                       Object object)

Specified by:

lastIndexOf in interface List<E>

contains

public boolean contains(@CheckForNull
                        Object object)

Specified by:

contains in interface Collection<E>

Specified by:

contains in interface List<E>

Specified by:

contains in class ImmutableCollection<E>

subList

public ImmutableList<E> subList(int fromIndex,
                                int toIndex)

Returns an immutable list of the elements between the specified fromIndex, inclusive, and toIndex, exclusive. (If fromIndex and toIndex are equal, the empty immutable list is returned.)

Note: in almost all circumstances, the returned ImmutableList retains a strong reference to this, which may prevent the original list from being garbage collected. If you want the original list to be eligible for garbage collection, you should create and use a copy of the sub list (e.g., ImmutableList.copyOf(originalList.subList(...))).

Specified by:

subList in interface List<E>

addAll

@CanIgnoreReturnValue
@Deprecated
public final boolean addAll(int index,
                            Collection<? extends E> newElements)

Deprecated.

Unsupported operation.

Guaranteed to throw an exception and leave the list unmodified.

Specified by:

addAll in interface List<E>

Throws:

UnsupportedOperationException - always

set

@CanIgnoreReturnValue
@Deprecated
public final E set(int index,
                   E element)

Deprecated.

Unsupported operation.

Guaranteed to throw an exception and leave the list unmodified.

Specified by:

set in interface List<E>

Throws:

UnsupportedOperationException - always

add

@Deprecated
public final void add(int index,
                      E element)

Deprecated.

Unsupported operation.

Guaranteed to throw an exception and leave the list unmodified.

Specified by:

add in interface List<E>

Throws:

UnsupportedOperationException - always

remove

@CanIgnoreReturnValue
@Deprecated
public final E remove(int index)

Deprecated.

Unsupported operation.

Guaranteed to throw an exception and leave the list unmodified.

Specified by:

remove in interface List<E>

Throws:

UnsupportedOperationException - always

asList

@InlineMe(replacement="this")
@Deprecated
public final ImmutableList<E> asList()

Deprecated.

There is no reason to use this; it always returns this.

Returns this list instance.

Overrides:

asList in class ImmutableCollection<E>

Since:

2.0

reverse

public ImmutableList<E> reverse()

Returns a view of this immutable list in reverse order. For example, ImmutableList.of(1, 2, 3).reverse() is equivalent to ImmutableList.of(3, 2, 1).

Returns:

a view of this immutable list in reverse order

Since:

7.0

equals

public boolean equals(@CheckForNull
                      Object obj)

Specified by:

equals in interface Collection<E>

Specified by:

equals in interface List<E>

Overrides:

equals in class Object

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<E>

Specified by:

hashCode in interface List<E>

Overrides:

hashCode in class Object

builder

public static <E> ImmutableList.Builder<E> builder()

Returns a new builder. The generated builder is equivalent to the builder created by the ImmutableList.Builder constructor.

builderWithExpectedSize

public static <E> ImmutableList.Builder<E> builderWithExpectedSize(int expectedSize)

Returns a new builder, expecting the specified number of elements to be added.

If expectedSize is exactly the number of elements added to the builder before ImmutableList.Builder.build() is called, the builder is likely to perform better than an unsized builder() would have.

It is not specified if any performance benefits apply if expectedSize is close to, but not exactly, the number of elements added to the builder.

Since:

23.1