org.apache.commons.collections.collection

This package contains implementations of the {@link java.util.Collection Collection} interface.

The following implementations are provided in the package:

• CompositeCollection - a collection that combines multiple collections into one

• Synchronized - synchronizes method access for multi-threaded environments
• Unmodifiable - ensures the collection cannot be altered
• Predicated - ensures that only elements that are valid according to a predicate can be added
• Typed - ensures that only elements that are of a specific type can be added
• Transformed - transforms elements as they are added

Each method call made on this Collection is forwarded to the decorated Collection.

You should create a concrete subclass of this class to test any custom Collection implementation.

Changes made to this collection will actually be made on the decorated collection. Add and remove operations require the use of a pluggable strategy.

The validation of additions is performed via an instanceof test against a specified Class.