Commons-Collections builds on the powerful Java Collections Framework
by providing new collection types and implementations, including (from the Jakarta site):
- Bag interface for collections that have a number of copies of each object
- Buffer interface for collections that have a well defined removal order, like FIFOs
- BidiMap interface for maps that can be looked up from value to key as well and key to value
- MapIterator interface to provide simple and quick iteration over maps
- Type checking decorators to ensure that only instances of a certain type can be added
- Transforming decorators that alter each object as it is added to the collection
- Composite collections that make multiple collections look like one
- Ordered maps and sets that retain the order elements are added in, including an LRU based map
- Identity map that compares objects based on their identity (==) instead of the equals method
- Reference map that allows keys and/or values to be garbage collected under close control
- Many comparator implementations
- Many iterator implementations
- Adapter classes from array and enumerations to collections
- Utilities to test or create typical set-theory properties of collections such as union, intersection, and closure
News
| Version 4.01 Released |
06.30.2006 |
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This release contains many generics enhancements to the CollectionUtils class, as well as typing improvements across the Predicate classes.
It also includes several bugfixes and enhancements from the sourceforge trackers.
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| Version 4.0 Beta 3 Released |
07.07.2005 |
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This release is a fully-functional beta with no known bugs.
A few clean-ups to Javadocs, the MultiMap interface, and the package structure.
The top-level package for the project is now org.apache.commons.collections15.
All unit tests pass.
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| Version 4.0 Beta 2 Released |
06.15.2005 |
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This release is a fully-functional beta with no known bugs.
MultiMap and related classes have been overhauled to better work with Java 1.5.
All unit tests pass.
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