# Package org.apache.commons.collections.collection

This package contains implementations of the `Collection` interface.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  CompositeCollection.CollectionMutator | Pluggable strategy to handle changes to the composite.

- Class Summary
  Class | Description
  --- | ---
  AbstractCollectionDecorator | Decorates another `Collection` to provide additional behaviour.
  AbstractSerializableCollectionDecorator | Serializable subclass of AbstractCollectionDecorator.
  CompositeCollection | Decorates a collection of other collections to provide a single unified view.
  PredicatedCollection | Decorates another `Collection` to validate that additions match a specified predicate.
  SynchronizedCollection | Decorates another `Collection` to synchronize its behaviour for a multi-threaded environment.
  TransformedCollection | Decorates another `Collection` to transform objects that are added.
  TypedCollection | Decorates a `Collection` to validate that elements added are of a specific type.
  UnmodifiableBoundedCollection | `UnmodifiableBoundedCollection` decorates another `BoundedCollection` to ensure it can't be altered.
  UnmodifiableCollection | Decorates another `Collection` to ensure it can't be altered.

## Package org.apache.commons.collections.collection Description

This package contains implementations of the `Collection` interface.

The following implementations are provided in the package:

- CompositeCollection - a collection that combines multiple collections into one

The following decorators are provided in the package:

- 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

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