| AbstractCollectionDecorator | Decorates another Collection to provide additional behaviour. |
| CompositeCollection | Decorates a collection of other collections to provide a single unified view. |
| CompositeCollection.CollectionMutator | Pluggable strategy to handle changes to the composite. |
| 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. |