Java API Documentation

According to JAVA SE 8

Data Structures

import java.util.*;

List

Modifier and Type Method and Description
boolean add(E e)

Appends the specified element to the end of this list (optional operation).
void add(int index, E element)

Inserts the specified element at the specified position in this list (optional operation).
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 (optional operation).
boolean 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).
void clear()

Removes all of the elements from this list (optional operation).
boolean contains(Object o)

Returns true if this list contains the specified element.
boolean containsAll(Collection<?> c)

Returns true if this list contains all of the elements of the specified collection.
boolean equals(Object o)

Compares the specified object with this list for equality.
E get(int index)

Returns the element at the specified position in this list.
int hashCode()

Returns the hash code value for this list.
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.
boolean isEmpty()

Returns true if this list contains no elements.
Iterator<E> iterator()

Returns an iterator over the elements in this list in proper sequence.
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.
ListIterator<E> listIterator()

Returns a list iterator over the elements in this list (in proper sequence).
ListIterator<E> listIterator(int index)

Returns a list iterator over the elements in this list (in proper sequence), starting at the specified position in the list.
E remove(int index)

Removes the element at the specified position in this list (optional operation).
boolean remove(Object o)

Removes the first occurrence of the specified element from this list, if it is present (optional operation).
boolean removeAll(Collection<?> c)

Removes from this list all of its elements that are contained in the specified collection (optional operation).
default void replaceAll(UnaryOperator<E> operator)

Replaces each element of this list with the result of applying the operator to that element.
boolean retainAll(Collection<?> c)

Retains only the elements in this list that are contained in the specified collection (optional operation).
E set(int index, E element)

Replaces the element at the specified position in this list with the specified element (optional operation).
int size()

Returns the number of elements in this list.
default void sort(Comparator<? super E> c)

Sorts this list according to the order induced by the specified Comparator.
default Spliterator<E> spliterator()

Creates a Spliterator over the elements in this list.
List<E> subList(int fromIndex, int toIndex)

Returns a view of the portion of this list between the specified fromIndex, inclusive, and toIndex, exclusive.
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.
ArrayList

List<E> list = new ArrayList<E>();

void ensureCapacity(int minCapacity)

Increases the capacity of this ArrayList instance, if necessary, to ensure that it can hold at least the number of elements specified by the minimum capacity argument.
void forEach(Consumer<? super E> action)

Performs the given action for each element of the Iterable until all elements have been processed or the action throws an exception.
boolean removeIf(Predicate<? super E> filter)

Removes all of the elements of this collection that satisfy the given predicate.
protected void removeRange(int fromIndex, int toIndex)

Removes from this list all of the elements whose index is betweenfromIndex, inclusive, and toIndex, exclusive.
void trimToSize()

Trims the capacity of this ArrayList instance to be the list’s current size.
LinkedList

List<E> list = new LinkedList<E>();

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.
Iterator<E> descendingIterator()

Returns an iterator over the elements in this deque in reverse sequential order.
E element()

Retrieves, but does not remove, the head (first element) of this list.
E getFirst()

Returns the first element in this list.
E getLast()

Returns the last element in 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.
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 nullif this list is empty.
E peekLast()

Retrieves, but does not remove, the last element of this list, or returns nullif this list is empty.
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.
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).
Stack

List<E> list = new Stack<E>();

boolean empty()

Tests if this stack is empty.
E peek()

Looks at the object at the top of this stack without removing it from the stack.
E pop()

Removes the object at the top of this stack and returns that object as the value of this function.
E push(E item)

Pushes an item onto the top of this stack.
int search(Object o)

Returns the 1-based position where an object is on this stack.
Vector

List<E> list = new Vector<E>();