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AbstractSequentialList in Java with Examples

Last Updated : 24 Apr, 2026

AbstractSequentialList is an abstract class in the Java Collections Framework that provides a skeletal implementation of the List interface for sequential-access data structures like linked lists. It simplifies list implementation by providing default methods.

  • Extends AbstractList and is designed for sequential access rather than random access.
  • Abstract class, so it cannot be instantiated directly.
  • For AbstractSequentialList, you must implement listIterator(int index) and size()

Output
[5, 6, 7]

Hierarchy of AbstractSequentialList

It implements Iterable<E>, Collection<E>, and List<E> interfaces.

👁 interface

Implementing class Of AbstractSequentialList

LinkedList : it is the only direct subclass of AbstractSequentialList.

Declaration of AbstractSequentialList

public abstract class AbstractSequentialList<E>extends AbstractList<E>

Constructors of AbstractSequentialList

protected AbstractSequentialList(): Since it is protected and the class is abstract, objects cannot be created directly.

AbstractSequentialList<Integer> asl = new LinkedList<Integer>();


Output
AbstractSequentialList: [Geeks, for, Geeks, 10, 20]
Final List: [Geeks, for, Geeks, 20]
The element is: Geeks

Methods of AbstractSequentialList

METHOD

DESCRIPTION

 add​(int index, E element)Inserts the specified element at the specified position in this list (optional operation).
 addAll​(int index, Collection<? extends E> c)Inserts all of the elements in the specified collection into this list at the specified position (optional operation).
 get​(int index)Returns the element at the specified position in this list.
 iterator()Returns an iterator over the elements in this list (in proper sequence).
listIterator​(int index)Returns a list iterator over the elements in this list (in proper sequence).
remove​(int index)Removes the element at the specified position in this list (optional operation).
set​(int index, E element)Replaces the element at the specified position in this list with the specified element (optional operation).

Methods Inherited From class java.util.AbstractList

METHOD

DESCRIPTION

add​(E e)Appends the specified element to the end of this list (optional operation).
clear()Removes all of the elements from this list (optional operation).
equals​(Object o)Compares the specified object with this list for equality.
hashCode()Returns the hash code value for this list.
indexOf​(Object o)Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
lastIndexOf​(Object o)Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
listIterator()Returns a list iterator over the elements in this list (in proper sequence).
removeRange​(int fromIndex, int toIndex)Removes from this list all of the elements whose index is between fromIndex, inclusive, and toIndex, exclusive.
subList​(int fromIndex, int toIndex)Returns a view of the portion of this list between the specified fromIndex, inclusive, and toIndex, exclusive.

 Methods Inherited From class java.util.AbstractCollection

METHOD

DESCRIPTION

addAll​(Collection<? extends E> c)Adds all of the elements in the specified collection to this collection (optional operation).
contains​(Object o)Returns true if this collection contains the specified element.
containsAll​(Collection<?> c)Returns true if this collection contains all of the elements in the specified collection.
isEmpty()Returns true if this collection contains no elements.
remove​(Object o)Removes a single instance of the specified element from this collection, if it is present (optional operation).
removeAll​(Collection<?> c)Removes all of this collection's elements that are also contained in the specified collection (optional operation).
 retainAll​(Collection<?> c)Retains only the elements in this collection that are contained in the specified collection (optional operation).
 toArray()Returns an array containing all of the elements in this collection.
 toArray​(T[] a)Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.
 toString()Returns a string representation of this collection.

Methods Inherited From Interface java.util.Collection

METHOD

DESCRIPTION

parallelStream()Returns a possibly parallel Stream with this collection as its source.
removeIf​(Predicate<? super E> filter)Removes all of the elements of this collection that satisfy the given predicate.
stream()Returns a sequential Stream with this collection as its source.
toArray​(IntFunction<T[]> generator)Returns an array containing all of the elements in this collection, using the provided generator function to allocate the returned array.

Methods Inherited From Interface java.lang.Iterable

METHOD

DESCRIPTION

forEach​(Consumer<? super T> action)Performs the given action for each element of the Iterable until all elements have been processed or the action throws an exception.

Methods Inherited From Interface java.util.List

METHODDESCRIPTION
addAll​(Collection<? extends E> c)

Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection's iterator (optional operation).

contains​(Object o)Returns true if this list contains the specified element.
containsAll​(Collection<?> c)Returns true if this list contains all of the elements of the specified collection.
isEmpty()Returns true if this list contains no elements.
remove​(Object o)Removes the first occurrence of the specified element from this list, if it is present (optional operation).
removeAll​(Collection<?> c)Removes from this list all of its elements that are contained in the specified collection (optional operation).
replaceAll​(UnaryOperator<E> operator)Replaces each element of this list with the result of applying the operator to that element.
retainAll​(Collection<?> c)Retains only the elements in this list that are contained in the specified collection (optional operation).
size()Returns the number of elements in this list.
sort​(Comparator<? super E> c)Sorts this list according to the order induced by the specified Comparator.
spliterator()Creates a Spliterator over the elements in this list.
toArray()Returns an array containing all of the elements in this list in proper sequence (from first to last element).
toArray​(T[] a)

Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.


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