# Package org.apache.commons.collections4.list

This package contains implementations of the `List` interface.

See: Description

- Class Summary
  Class | Description
  --- | ---
  AbstractLinkedList<E> | An abstract implementation of a linked list which provides numerous points for subclasses to override.
  AbstractLinkedList.LinkedListIterator<E> | A list iterator over the linked list.
  AbstractLinkedList.LinkedSubList<E> | The sublist implementation for AbstractLinkedList.
  AbstractLinkedList.LinkedSubListIterator<E> | A list iterator over the linked sub list.
  AbstractLinkedList.Node<E> | A node within the linked list.
  AbstractListDecorator<E> | Decorates another `List` to provide additional behaviour.
  AbstractSerializableListDecorator<E> | Serializable subclass of AbstractListDecorator.
  CursorableLinkedList<E> | A `List` implementation with a `ListIterator` that allows concurrent modifications to the underlying list.
  CursorableLinkedList.Cursor<E> | An extended `ListIterator` that allows concurrent changes to the underlying list.
  CursorableLinkedList.SubCursor<E> | A cursor for the sublist based on LinkedSubListIterator.
  FixedSizeList<E> | Decorates another `List` to fix the size preventing add/remove.
  GrowthList<E> | Decorates another `List` to make it seamlessly grow when indices larger than the list size are used on add and set, avoiding most IndexOutOfBoundsExceptions.
  LazyList<E> | Decorates another `List` to create objects in the list on demand.
  NodeCachingLinkedList<E> | A `List` implementation that stores a cache of internal Node objects in an effort to reduce wasteful object creation.
  PredicatedList<E> | Decorates another `List` to validate that all additions match a specified predicate.
  SetUniqueList<E> | Decorates a `List` to ensure that no duplicates are present much like a `Set`.
  TransformedList<E> | Decorates another `List` to transform objects that are added.
  TreeList<E> | A `List` implementation that is optimised for fast insertions and removals at any index in the list.
  UnmodifiableList<E> | Decorates another `List` to ensure it can't be altered.

## Package org.apache.commons.collections4.list Description

This package contains implementations of the `List` interface.

The following implementations are provided in the package:

- TreeList - a list that is optimised for insertions and removals at any index in the list
- CursorableLinkedList - a list that can be modified while the listIterator (cursor) is being used
- NodeCachingLinkedList - a linked list that caches the storage nodes for a performance gain

The following decorators are provided in the package:

- Unmodifiable - ensures the collection cannot be altered
- Predicated - ensures that only elements that are valid according to a predicate can be added
- Transformed - transforms each element added
- FixedSize - ensures that the size of the list cannot change
- Lazy - creates objects in the list on demand
- Growth - grows the list instead of erroring when set/add used with index beyond the list size
- SetUnique - a list that avoids duplicate entries like a Set

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