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Java Queue and Dequeue: Understanding the Basics

In this article, we will delve into the world of Java collections and explore the concepts of queues and deques. We will discuss what these terms mean, how they differ from each other, and provide examples to help you better understand their usage.

What is a Queue in Java?

A queue is a linear data structure that follows the First-In-First-Out (FIFO) principle. This means that elements are added to the end of the queue and removed from the front of the queue. In Java, the `Queue` interface provides methods for adding and removing elements, as well as checking if the queue is empty or full.

What is a Dequeue in Java?

A deque (short for double-ended queue) is a linear data structure that allows elements to be added or removed from both ends. This means that we can add elements to the front of the deque and remove them from either end. In Java, the `Deque` interface provides methods for adding and removing elements from both ends.

Implementing Deque in Java

To implement a deque in Java, we need to use concrete classes such as `ArrayDeque` or `LinkedList`. These classes provide the functionality of the deque interface. Here's an example of how to create a deque object using the `ArrayDeque` class:

```java

Deque deque_obj = new ArrayDeque<>();

```

Here are some key features of deques in Java:

* Deques are not thread-safe unless external synchronization is provided.

* Deques do not support concurrent access by more than one thread.

* Deques do not allow the use of null values.

* Deques support resizable arrays that can grow as required.

Use Cases for Deque

Deques have a wide range of applications, including:

* Implementing undo or history features in web browsers

* Implementing priority queues

In this article, we have learned about Java queues and deques, including their differences, key features, and use cases. We hope that this information has been helpful in understanding the basics of these data structures.

Java queue and dequeue