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  /*
   * Copyright (C) 2007 The Guava Authors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

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 java.util.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 java.util.Collection that may contain duplicate values like a java.util.List, yet has order-independent equality like a java.util.Set. One typical use for a multiset is to represent a histogram.
Multimap
A new type, which is similar to java.util.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(java.lang.Object). ListMultimap takes its name from the fact that the ListMultimap.get(java.lang.Object) associated with a given key fulfills the java.util.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 java.util.Set contract.
SortedSetMultimap
An extension of SetMultimap for which the collection values associated with a given key is a java.util.SortedSet.
Table
A new type, which is similar to java.util.Map, but which indexes its values by an ordered pair of keys, a row key and column key.
ClassToInstanceMap
An extension of java.util.Map that associates a raw type with an instance of that type.

Collection Implementations

of java.util.List

of java.util.Set

of java.util.Map

of BiMap

of Multiset

of Multimap

of Table

of ClassToInstanceMap

Classes of static utility methods

Comparison

Abstract implementations

Ranges

Other

Forwarding collections

@javax.annotation.ParametersAreNonnullByDefault
package com.google.common.collect;
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