This library is a natural extension of the java collections framework. 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:
* immutable collections
* forwarding collections
* constrained collections
* implementation helpers like abstractiterator