org.apache.commons.collections4.list

## Class UnmodifiableList<E>

- java.lang.Object
- - org.apache.commons.collections4.collection.AbstractCollectionDecorator<E>
  - - org.apache.commons.collections4.list.AbstractListDecorator<E>
    - - org.apache.commons.collections4.list.AbstractSerializableListDecorator<E>
      - - org.apache.commons.collections4.list.UnmodifiableList<E>

- All Implemented Interfaces:
    Serializable, Iterable<E>, Collection<E>, List<E>, Unmodifiable

      public final class UnmodifiableList<E>
      extends AbstractSerializableListDecorator<E>
      implements Unmodifiable

  Decorates another `List` to ensure it can't be altered.

  This class is Serializable from Commons Collections 3.1.

  Attempts to modify it will result in an UnsupportedOperationException.

  Since:
    3.0
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `UnmodifiableList(List<? extends E> list)` Constructor that wraps (not copies).

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `add(int index, E object)`
    `boolean` | `add(Object object)`
    `boolean` | `addAll(Collection<? extends E> coll)`
    `boolean` | `addAll(int index, Collection<? extends E> coll)`
    `void` | `clear()`
    `Iterator<E>` | `iterator()`
    `ListIterator<E>` | `listIterator()`
    `ListIterator<E>` | `listIterator(int index)`
    `E` | `remove(int index)`
    `boolean` | `remove(Object object)`
    `boolean` | `removeAll(Collection<?> coll)`
    `boolean` | `retainAll(Collection<?> coll)`
    `E` | `set(int index, E object)`
    `List<E>` | `subList(int fromIndex, int toIndex)`
    `static <E> List<E>` | `unmodifiableList(List<? extends E> list)` Factory method to create an unmodifiable list.

    - ### Methods inherited from class org.apache.commons.collections4.list.AbstractListDecorator

      `decorated, equals, get, hashCode, indexOf, lastIndexOf`

    - ### Methods inherited from class org.apache.commons.collections4.collection.AbstractCollectionDecorator

      `contains, containsAll, isEmpty, setCollection, size, toArray, toArray, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface java.util.List

      `contains, containsAll, isEmpty, replaceAll, size, sort, spliterator, toArray, toArray`

    - ### Methods inherited from interface java.util.Collection

      `parallelStream, removeIf, stream`

    - ### Methods inherited from interface java.lang.Iterable

      `forEach`

- - ### Constructor Detail

    - #### UnmodifiableList

          public UnmodifiableList(List<? extends E> list)

      Constructor that wraps (not copies).
      Parameters:
        `list` - the list to decorate, must not be null
      Throws:
        `NullPointerException` - if list is null

  - ### Method Detail

    - #### unmodifiableList

          public static <E> List<E> unmodifiableList(List<? extends E> list)

      Factory method to create an unmodifiable list.
      Type Parameters:
        `E` - the type of the elements in the list
      Parameters:
        `list` - the list to decorate, must not be null
      Returns:
        a new unmodifiable list
      Throws:
        `NullPointerException` - if list is null
      Since:
        4.0

    - #### iterator

          public Iterator<E> iterator()

      Specified by:
        `iterator` in interface `Iterable<E>`
      Specified by:
        `iterator` in interface `Collection<E>`
      Specified by:
        `iterator` in interface `List<E>`
      Overrides:
        `iterator` in class `AbstractCollectionDecorator<E>`

    - #### add

          public boolean add(Object object)

      Specified by:
        `add` in interface `Collection<E>`
      Specified by:
        `add` in interface `List<E>`
      Overrides:
        `add` in class `AbstractCollectionDecorator<E>`

    - #### addAll

          public boolean addAll(Collection<? extends E> coll)

      Specified by:
        `addAll` in interface `Collection<E>`
      Specified by:
        `addAll` in interface `List<E>`
      Overrides:
        `addAll` in class `AbstractCollectionDecorator<E>`

    - #### clear

          public void clear()

      Specified by:
        `clear` in interface `Collection<E>`
      Specified by:
        `clear` in interface `List<E>`
      Overrides:
        `clear` in class `AbstractCollectionDecorator<E>`

    - #### remove

          public boolean remove(Object object)

      Specified by:
        `remove` in interface `Collection<E>`
      Specified by:
        `remove` in interface `List<E>`
      Overrides:
        `remove` in class `AbstractCollectionDecorator<E>`

    - #### removeAll

          public boolean removeAll(Collection<?> coll)

      Specified by:
        `removeAll` in interface `Collection<E>`
      Specified by:
        `removeAll` in interface `List<E>`
      Overrides:
        `removeAll` in class `AbstractCollectionDecorator<E>`

    - #### retainAll

          public boolean retainAll(Collection<?> coll)

      Specified by:
        `retainAll` in interface `Collection<E>`
      Specified by:
        `retainAll` in interface `List<E>`
      Overrides:
        `retainAll` in class `AbstractCollectionDecorator<E>`

    - #### listIterator

          public ListIterator<E> listIterator()

      Specified by:
        `listIterator` in interface `List<E>`
      Overrides:
        `listIterator` in class `AbstractListDecorator<E>`

    - #### listIterator

          public ListIterator<E> listIterator(int index)

      Specified by:
        `listIterator` in interface `List<E>`
      Overrides:
        `listIterator` in class `AbstractListDecorator<E>`

    - #### add

          public void add(int index,
                          E object)

      Specified by:
        `add` in interface `List<E>`
      Overrides:
        `add` in class `AbstractListDecorator<E>`

    - #### addAll

          public boolean addAll(int index,
                                Collection<? extends E> coll)

      Specified by:
        `addAll` in interface `List<E>`
      Overrides:
        `addAll` in class `AbstractListDecorator<E>`

    - #### remove

          public E remove(int index)

      Specified by:
        `remove` in interface `List<E>`
      Overrides:
        `remove` in class `AbstractListDecorator<E>`

    - #### set

          public E set(int index,
                       E object)

      Specified by:
        `set` in interface `List<E>`
      Overrides:
        `set` in class `AbstractListDecorator<E>`

    - #### subList

          public List<E> subList(int fromIndex,
                                 int toIndex)

      Specified by:
        `subList` in interface `List<E>`
      Overrides:
        `subList` in class `AbstractListDecorator<E>`

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