## Package org.apache.commons.collections.set

This package contains implementations of the `Set` and `SortedSet` interfaces.

See:
Description

Interface Summary
CompositeSet.SetMutator: Define callbacks for mutation operations.

Class Summary
AbstractSerializableSetDecorator: Serializable subclass of AbstractSetDecorator.
AbstractSetDecorator: Decorates another `Set` to provide additional behaviour.
AbstractSortedSetDecorator: Decorates another `SortedSet` to provide additional behaviour.
CompositeSet: Decorates a set of other sets to provide a single unified view.
ListOrderedSet: Decorates another `Set` to ensure that the order of addition is retained and used by the iterator.
MapBackedSet: Decorates a `Map` to obtain `Set` behaviour.
PredicatedSet: Decorates another `Set` to validate that all additions match a specified predicate.
PredicatedSortedSet: Decorates another `SortedSet` to validate that all additions match a specified predicate.
SynchronizedSet: Decorates another `Set` to synchronize its behaviour for a multi-threaded environment.
SynchronizedSortedSet: Decorates another `SortedSet` to synchronize its behaviour for a multi-threaded environment.
TransformedSet: Decorates another `Set` to transform objects that are added.
TransformedSortedSet: Decorates another `SortedSet` to transform objects that are added.
TypedSet: Decorates another `Set` to validate that elements added are of a specific type.
TypedSortedSet: Decorates another `SortedSet` to validate that elements added are of a specific type.
UnmodifiableSet: Decorates another `Set` to ensure it can't be altered.
UnmodifiableSortedSet: Decorates another `SortedSet` to ensure it can't be altered.

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

This package contains implementations of the `Set` and `SortedSet` interfaces.

The implementations are in the form of direct implementations and decorators. A decorator wraps another implementation of the interface to add some specific additional functionality.

The following implementations are provided in the package:

- CompositeSet - a set that combines multiple sets 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 each element added
- ListOrdered - ensures that insertion order is retained
- MapBackedSet - a set formed by decorating a Map

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