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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

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Commons-Collections contains implementations, enhancements and utilities that complement the Java Collections Framework.

The Apache Commons Collections Framework component adds a significant amount of enhancements to the standard JDK collections. These enhancements come in the form of new interfaces, new implementations and utility classes.

See also the java.util package for the standard Java collections.

Main features

Commons-Collections defines a number of key interfaces:

InterfaceDescription
{@link org.apache.commons.collections.Bag} A new Collection subinterface that stores each object together with the number of occurrences. Methods are provided to get the number of occurrences, and to add and remove a certain number of that object.
{@link org.apache.commons.collections.Buffer} A new Collection subinterface that allows objects to be removed in some well-defined order. Methods enable the next item to be peeked and removed.
{@link org.apache.commons.collections.BidiMap} A new Map subinterface that allows lookup from key to value and from value to key with equal ease.
{@link org.apache.commons.collections.OrderedMap} A new Map subinterface that is used when a map has an order, but is not sorted. Methods enable bidirectional iteration through the map.
{@link org.apache.commons.collections.MapIterator} A new Iterator subinterface specially designed for maps. This iterator avoids the need for entrySet iteration of a map, and is simpler to use.
{@link org.apache.commons.collections.ResettableIterator} A new Iterator subinterface that allows the iteration to be reset back to the start. Many iterators in this library have this functionality.
{@link org.apache.commons.collections.Closure}
{@link org.apache.commons.collections.Predicate}
{@link org.apache.commons.collections.Transformer}
{@link org.apache.commons.collections.Factory}
A group of functor interfaces that provide plugin behaviour to various collections and utilities.

In addition to the interfaces, there are many implementations. Consult each subpackage for full details of these.





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