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google-collections - Google Collections Library
- Description:
The Google Collections Library 1.0 is a suite of new
collections and collection-related goodness for Java 5.0,
brought to you by Google.
This library is a natural extension of the Java Collections
Framework you already know and love.
The major new types are:
* BiMap. A Map that guarantees unique values, and supports
an inverse view.
* Multiset. A Collection that may contain duplicate values
like a List, yet has order-independent equality like a Set.
Often used to represent a histogram.
* Multimap. Similar to Map, but may contain duplicate keys.
Has subtypes SetMultimap and ListMultimap providing more
specific behavior.
There are also more than a dozen collection implementations,
mostly of the interfaces above, but not all. ReferenceMap,
for example, is a ConcurrentMap implementation which easily
handles any combination of strong, soft or weak keys with
strong, soft or weak values.
Static utility classes include:
* Comparators. Natural order, compound, null-friendly,
ad-hoc . . .
* Iterators and Iterables. Element-based equality, cycle,
concat, partition, filter with predicate, transform with
function . . .
* Lists, Sets and Maps. A plethora of convenient factory
methods and much more.
* PrimitiveArrays: "boxing"/"unboxing" of primitive arrays
And there's more:
* Forwarding collections
* Constrained collections
* Implementation helpers like AbstractIterator
Packages