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@ParametersAreNonnullByDefault

Package com.google.common.collect

This package contains generic collection interfaces and implementations, and other utilities for working with collections.

See:
          Description

Interface Summary
BiMap<K,V> A bimap (or "bidirectional map") is a map that preserves the uniqueness of its values as well as that of its keys.
ClassToInstanceMap<B> A map, each entry of which maps a Java raw type to an instance of that type.
Constraint<E> A constraint that an element must satisfy in order to be added to a collection.
Interner<E> Provides equivalent behavior to String.intern() for other immutable types.
ListMultimap<K,V> A Multimap that can hold duplicate key-value pairs and that maintains the insertion ordering of values for a given key.
MapConstraint<K,V> A constraint on the keys and values that may be added to a Map or Multimap.
MapDifference<K,V> An object representing the differences between two maps.
MapDifference.ValueDifference<V> A difference between the mappings from two maps with the same key.
Multimap<K,V> A collection similar to a Map, but which may associate multiple values with a single key.
Multiset<E> A collection that supports order-independent equality, like Set, but may have duplicate elements.
Multiset.Entry<E> An unmodifiable element-count pair for a multiset.
PeekingIterator<E> An iterator that supports a one-element lookahead while iterating.
SetMultimap<K,V> A Multimap that cannot hold duplicate key-value pairs.
SortedSetMultimap<K,V> A SetMultimap whose set of values for a given key are kept sorted; that is, they comprise a SortedSet.
 

Class Summary
AbstractIterator<T> This class provides a skeletal implementation of the Iterator interface, to make this interface easier to implement for certain types of data sources.
ArrayListMultimap<K,V> Implementation of Multimap that uses an ArrayList to store the values for a given key.
Collections2 Provides static methods for working with Collection instances.
ComparisonChain A utility for performing a "lazy" chained comparison statement, which performs comparisons only until it finds a nonzero result.
ConcurrentHashMultiset<E> A multiset that supports concurrent modifications and that provides atomic versions of most Multiset operations (exceptions where noted).
Constraints Factories and utilities pertaining to the Constraint interface.
EnumBiMap<K extends Enum<K>,V extends Enum<V>> A BiMap backed by two EnumMap instances.
EnumHashBiMap<K extends Enum<K>,V> A BiMap backed by an EnumMap instance for keys-to-values, and a HashMap instance for values-to-keys.
EnumMultiset<E extends Enum<E>> Multiset implementation backed by an EnumMap.
ForwardingCollection<E> A collection which forwards all its method calls to another collection.
ForwardingConcurrentMap<K,V> A concurrent map which forwards all its method calls to another concurrent map.
ForwardingIterator<T> An iterator which forwards all its method calls to another iterator.
ForwardingList<E> A list which forwards all its method calls to another list.
ForwardingListIterator<E> A list iterator which forwards all its method calls to another list iterator.
ForwardingListMultimap<K,V> A list multimap which forwards all its method calls to another list multimap.
ForwardingMap<K,V> A map which forwards all its method calls to another map.
ForwardingMapEntry<K,V> A map entry which forwards all its method calls to another map entry.
ForwardingMultimap<K,V> A multimap which forwards all its method calls to another multimap.
ForwardingMultiset<E> A multiset which forwards all its method calls to another multiset.
ForwardingObject An abstract base class for implementing the decorator pattern.
ForwardingQueue<E> A queue which forwards all its method calls to another queue.
ForwardingSet<E> A set which forwards all its method calls to another set.
ForwardingSetMultimap<K,V> A set multimap which forwards all its method calls to another set multimap.
ForwardingSortedMap<K,V> A sorted map which forwards all its method calls to another sorted map.
ForwardingSortedSet<E> A sorted set which forwards all its method calls to another sorted set.
ForwardingSortedSetMultimap<K,V> A sorted set multimap which forwards all its method calls to another sorted set multimap.
HashBiMap<K,V> A BiMap backed by two HashMap instances.
HashMultimap<K,V> Implementation of Multimap using hash tables.
HashMultiset<E> Multiset implementation backed by a HashMap.
ImmutableBiMap<K,V> An immutable BiMap with reliable user-specified iteration order.
ImmutableBiMap.Builder<K,V> A builder for creating immutable bimap instances, especially public static final bimaps ("constant bimaps").
ImmutableClassToInstanceMap<B> A class-to-instance map backed by an ImmutableMap.
ImmutableClassToInstanceMap.Builder<B> A builder for creating immutable class-to-instance maps.
ImmutableCollection<E> An immutable collection.
ImmutableList<E> A high-performance, immutable, random-access List implementation.
ImmutableList.Builder<E> A builder for creating immutable list instances, especially public static final lists ("constant lists").
ImmutableListMultimap<K,V> An immutable ListMultimap with reliable user-specified key and value iteration order.
ImmutableListMultimap.Builder<K,V> A builder for creating immutable ListMultimap instances, especially public static final multimaps ("constant multimaps").
ImmutableMap<K,V> An immutable, hash-based Map with reliable user-specified iteration order.
ImmutableMap.Builder<K,V> A builder for creating immutable map instances, especially public static final maps ("constant maps").
ImmutableMultimap<K,V> An immutable Multimap.
ImmutableMultimap.Builder<K,V> A builder for creating immutable multimap instances, especially public static final multimaps ("constant multimaps").
ImmutableMultiset<E> An immutable hash-based multiset.
ImmutableMultiset.Builder<E> A builder for creating immutable multiset instances, especially public static final multisets ("constant multisets").
ImmutableSet<E> A high-performance, immutable Set with reliable, user-specified iteration order.
ImmutableSet.Builder<E> A builder for creating immutable set instances, especially public static final sets ("constant sets").
ImmutableSetMultimap<K,V> An immutable SetMultimap with reliable user-specified key and value iteration order.
ImmutableSetMultimap.Builder<K,V> A builder for creating immutable SetMultimap instances, especially public static final multimaps ("constant multimaps").
ImmutableSortedMap<K,V> An immutable SortedMap.
ImmutableSortedMap.Builder<K,V> A builder for creating immutable sorted map instances, especially public static final maps ("constant maps").
ImmutableSortedSet<E> An immutable SortedSet that stores its elements in a sorted array.
ImmutableSortedSet.Builder<E> A builder for creating immutable sorted set instances, especially public static final sets ("constant sets"), with a given comparator.
Interners Contains static methods pertaining to instances of Interner.
Iterables This class contains static utility methods that operate on or return objects of type Iterable.
Iterators This class contains static utility methods that operate on or return objects of type Iterator.
LinkedHashMultimap<K,V> Implementation of Multimap that does not allow duplicate key-value entries and that returns collections whose iterators follow the ordering in which the data was added to the multimap.
LinkedHashMultiset<E> A Multiset implementation with predictable iteration order.
LinkedListMultimap<K,V> An implementation of ListMultimap that supports deterministic iteration order for both keys and values.
Lists Static utility methods pertaining to List instances.
MapConstraints Factory and utilities pertaining to the MapConstraint interface.
MapMaker A ConcurrentMap builder, providing any combination of these features: soft or weak keys, soft or weak values, timed expiration, and on-demand computation of values.
Maps Static utility methods pertaining to Map instances.
Multimaps Provides static methods acting on or generating a Multimap.
Multisets Provides static utility methods for creating and working with Multiset instances.
MutableClassToInstanceMap<B> A mutable class-to-instance map backed by an arbitrary user-provided map.
ObjectArrays Static utility methods pertaining to object arrays.
Ordering<T> A comparator with added methods to support common functions.
Sets Static utility methods pertaining to Set instances.
Sets.SetView<E> An unmodifiable view of a set which may be backed by other sets; this view will change as the backing sets do.
TreeMultimap<K,V> Implementation of Multimap whose keys and values are ordered by their natural ordering or by supplied comparators.
TreeMultiset<E> A multiset which maintains the ordering of its elements, according to either their natural order or an explicit Comparator.
UnmodifiableIterator<E> An iterator that does not support UnmodifiableIterator.remove().
 

Exception Summary
AsynchronousComputationException Wraps an exception that occured during a computation in a different thread.
ComputationException Wraps an exception that occured during a computation.
 

Package com.google.common.collect Description

This package contains generic collection interfaces and implementations, and other utilities for working with collections. It is a part of the open-source Guava libraries.

Collection Types

BiMap
An extension of Map that guarantees the uniqueness of its values as well as that of its keys. This is sometimes called an "invertible map," since the restriction on values enables it to support an inverse view -- which is another instance of BiMap.
Multiset
An extension of Collection that may contain duplicate values like a List, yet has order-independent equality like a Set. One typical use for a multiset is to represent a histogram.
Multimap
A new type, which is similar to Map, but may contain multiple entries with the same key. Some behaviors of Multimap are left unspecified and are provided only by the subtypes mentioned below.
ListMultimap
An extension of Multimap which permits duplicate entries, supports random access of values for a particular key, and has partially order-dependent equality as defined by ListMultimap.equals(Object). ListMultimap takes its name from the fact that the collection of values associated with a given key fulfills the List contract.
SetMultimap
An extension of Multimap which has order-independent equality and does not allow duplicate entries; that is, while a key may appear twice in a SetMultimap, each must map to a different value. SetMultimap takes its name from the fact that the collection of values associated with a given key fulfills the Set contract.
SortedSetMultimap
An extension of SetMultimap for which the collection values associated with a given key is a SortedSet.
ClassToInstanceMap
An extension of Map that associates a raw type with an instance of that type.

Collection Implementations

of List

ImmutableList

of Set

ImmutableSet
ImmutableSortedSet

of Map

ImmutableMap
ImmutableSortedMap
MapMaker

of BiMap

ImmutableBiMap
HashBiMap
EnumBiMap
EnumHashBiMap

of Multiset

ImmutableMultiset
HashMultiset
LinkedHashMultiset
TreeMultiset
EnumMultiset
ConcurrentHashMultiset

of Multimap

ImmutableMultimap
ImmutableListMultimap
ImmutableSetMultimap
ArrayListMultimap
HashMultimap
TreeMultimap
LinkedHashMultimap
LinkedListMultimap

of ClassToInstanceMap

ImmutableClassToInstanceMap
MutableClassToInstanceMap

Classes of static utility methods

Collections2
Iterators
Iterables
Lists
Maps
Sets
Multisets
Multimaps
ObjectArrays

Comparison

Ordering
ComparisonChain

Abstract implementations

AbstractIterator
ImmutableCollection
UnmodifiableIterator

Other

Interner, Interners
Constraint, Constraints
MapConstraint, MapConstraints
MapDifference
PeekingIterator

Forwarding collections

ForwardingCollection
ForwardingConcurrentMap
ForwardingIterator
ForwardingList
ForwardingListIterator
ForwardingListMultimap
ForwardingMap
ForwardingMapEntry
ForwardingMultimap
ForwardingMultiset
ForwardingObject
ForwardingQueue
ForwardingSet
ForwardingSetMultimap
ForwardingSortedMap
ForwardingSortedSet
ForwardingSortedSetMultimap

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