So you have an array of restriction-free capacity and you can add new elements according to your needs. Deque in Java is an Interface, which implementations provide the support of a resizable array.Read about Queue in Java: Java Queue Interface and its implementations Deque’s features Read about Stack in Java: Java Stack 101: Delving into the Stack Class So you can enqueue and dequeue from both ends of a Java Deque, that means you can use a Deque as both queue and stack.
#Enqueue and dequeue in java code
We will demonstrate this example with Java code soon. Here we have an example: we add all yellow bricks to the top and all reds to the bottom. You can also remove a brick from both sides. You can add a new brick to the top of the tower or to the bottom. Imagine a typical lego brick and one-column “towers” made of the bricks. Java 8 or almost any other version supports it. Want to add or remove elements from the both sides of some linear structure? Use Deque. “Deque” is pronounced like a "deck" of cards and you know what? It is somewhat similar to a real deck of cards: you may take a card from the bottom or the top of such a deck.
The name “Deque” means “Double Ended Queue”. Hence, it seems to be a mixture of Stack and Queue. The same story with removing: you may remove the last or the first element from this structure. Queue vs DequeDeque is kinda weird type of Queue: you may add new elements both to the tail and the head of the line. It is similar to a stack of plates, adding or removing is only possible at the top. There is also an important data structure called Stack, a list that works with elements in totally reverse principle, LIFO - last in, first out. In Java Queue is an Interface, a part of the Collections Framework. This principle is called First In First Out (FIFO) and it works like any usual line of customers in real life. In the “traditional” queue you add elements to the tail of the line (after the last element) and remove elements from the head of the queue. You may add and remove elements both to the head and to the tail of the Deque. Java Deque is a data structure that combines an ordinary Queue and Stack.
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