What is Deque interface in Java programming?

The Deque (Double-Ended Queue) interface in Java is part of the Java Collections Framework and represents a data structure that allows the insertion and removal of elements from both ends. It extends the Queue interface and provides additional methods to manipulate the elements at both the front and the back of the queue. Key Features of Deque: Double-Ended Operations: You can add, remove, and access elements from both ends (head and tail) of the deque. Flexible Implementation: Deques can be implemented as either a linked list or an array, allowing for efficient operations. Supports Null Elements: Unlike some other collections, deques can contain null elements. Common Implementations: ArrayDeque: A resizable array implementation of the Deque interface. It is generally faster than LinkedList for most operations. LinkedList: A doubly linked list implementation that can also be used as a deque. Common Methods: Adding Elements: addFirst(E e): Inserts the specified element at the front of the deque. addLast(E e): Inserts the specified element at the end of the deque. offerFirst(E e): Inserts the specified element at the front of the deque, returning true upon success. offerLast(E e): Inserts the specified element at the end of the deque, returning true upon success. Removing Elements: removeFirst(): Removes and returns the first element of the deque. removeLast(): Removes and returns the last element of the deque. pollFirst(): Retrieves and removes the first element, or returns null if the deque is empty. pollLast(): Retrieves and removes the last element, or returns null if the deque is empty. Accessing Elements: getFirst(): Retrieves, but does not remove, the first element of the deque. getLast(): Retrieves, but does not remove, the last element of the deque. peekFirst(): Retrieves, but does not remove, the first element, or returns null if the deque is empty. peekLast(): Retrieves, but does not remove, the last element, or returns null if the deque is empty.