LinkedList class « LinkedList « List « Collections

Linked list implementation of the List interface. This class is a member of the Java Collections Framework.

Constructor	Summary
LinkedList()	Creates an empty list.
LinkedList(Collection<? extends E> c)	Creates a list containing the elements of the specified collection, in the order they are returned by the collection's iterator.

Add element to LinkedList

Return	Method	Summary
boolean	add(E e)	Appends the specified element to the end of this list.
void	add(int index, E element)	Inserts the specified element at the specified position in this list.
boolean	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.
boolean	addAll(int index, Collection<? extends E> c)	Inserts all of the elements in the specified collection into this list, starting at the specified position.
void	addFirst(E e)	Inserts the specified element at the beginning of this list.
void	addLast(E e)	Appends the specified element to the end of this list.
boolean	offer(E e)	Adds the specified element as the tail (last element) of this list.
boolean	offerFirst(E e)	Inserts the specified element at the front of this list.
boolean	offerLast(E e)	Inserts the specified element at the end of this list.

Remove all elements from LinkedList

Return	Method	Summary
void	clear()	Removes all of the elements from this list.

Shallow copy of a LinkedList

Return	Method	Summary
Object	clone()	Returns a shallow copy of this LinkedList.

If contain a certain element

Return	Method	Summary
boolean	contains(Object o)	Returns true if this list contains the specified element.

Get iterator from LinkedList

Return	Method	Summary
Iterator<E>	descendingIterator()	Returns an iterator over the elements in this deque in reverse sequential order.
ListIterator<E>	listIterator(int index)	Returns a list-iterator of the elements in this list (in proper sequence), starting at the specified position in the list.

Peek the element

Return	Method	Summary
E	element()	Retrieves, but does not remove, the head (first element) of this list.
E	peek()	Retrieves, but does not remove, the head (first element) of this list.
E	peekFirst()	Retrieves, but does not remove, the first element of this list, or returns null if this list is empty.
E	peekLast()	Retrieves, but does not remove, the last element of this list, or returns null if this list is empty.

Get the element from LinkedList

Return	Method	Summary
E	get(int index)	Returns the element at the specified position in this list.
E	getFirst()	Returns the first element in this list.
E	getLast()	Returns the last element in this list.

Get the index of an element

Return	Method	Summary
int	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.
int	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.

Poll, pop and push element to a LinkedList

Return	Method	Summary
E	poll()	Retrieves and removes the head (first element) of this list
E	pollFirst()	Retrieves and removes the first element of this list, or returns null if this list is empty.
E	pollLast()	Retrieves and removes the last element of this list, or returns null if this list is empty.
E	pop()	Pops an element from the stack represented by this list.
void	push(E e)	Pushes an element onto the stack represented by this list.

Remove element from a LinkedList

Return	Method	Summary
E	remove()	Retrieves and removes the head (first element) of this list.
E	remove(int index)	Removes the element at the specified position in this list.
boolean	remove(Object o)	Removes the first occurrence of the specified element from this list, if it is present.
E	removeFirst()	Removes and returns the first element from this list.
boolean	removeFirstOccurrence(Object o)	Removes the first occurrence of the specified element in this list (when traversing the list from head to tail).
E	removeLast()	Removes and returns the last element from this list.
boolean	removeLastOccurrence(Object o)	Removes the last occurrence of the specified element in this list (when traversing the list from head to tail).

Replace the element at the position

Return	Method	Summary
E	set(int index, E element)	Replaces the element at the specified position in this list with the specified element.

Get the size of a LinkedList

Return	Method	Summary
int	size()	Returns the number of elements in this list.

Convert LinkedList to Array

Return	Method	Summary
Object[]	toArray()	Returns an array containing all of the elements in this list in proper sequence (from first to last element).
<T> T[]	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.