In what situations is it recommended to use the Dequeue data structure in applications?

Deque (double-ended queue) is useful when you need to efficiently add and remove elements from both ends of a collection. It is recommended to use in the following situations:

• Implementation of caches with LRU or FIFO policies.
• Processing priority tasks, where tasks can be added at both the beginning and the end of the queue.
• Implementation of algorithms requiring bidirectional traversal, such as breadth-first search with the ability to add new nodes at the beginning or end.
• When you need to quickly change the order of elements without copying the entire collection.

In Java, to work with Deque, you can use the Deque interface and classes like ArrayDeque:

Deque<String> deque = new ArrayDeque<>();
deque.addFirst("First");
deque.addLast("Last");
String first = deque.removeFirst();
String last = deque.removeLast();