A queue is a collection of items whereby its operations work in a FIFO - First In First Out manner. The two primary operations associated with them are enqueue and dequeue.

In real life, we often encounter queues, whether it's waiting in line at a grocery store or in a drive-thru. The principle behind queues is also applicable in computer science and software development.

Java Implementation of a Queue

Let's start with a simple implementation of a queue using Java. In Java, we can use the Queue interface and its implementation class LinkedList to create a queue.

Here's an example of how to create and use a queue in Java:

1import java.util.Queue;
2import java.util.LinkedList;
3
4public class Main {
5  public static void main(String[] args) {
6    // Replace with your Java logic here
7    Queue<String> queue = new LinkedList<>();
8
9    // Enqueue elements
10    queue.add("Apple");
11    queue.add("Banana");
12    queue.add("Orange");
13
14    // Dequeue elements
15    while (!queue.isEmpty()) {
16      String element = queue.poll();
17      System.out.println(element);
18    }
19  }
20}

This code snippet demonstrates how to create a queue using the LinkedList class and perform enqueue and dequeue operations. In this example, the queue stores strings and the elements are added to the queue using the add method. The poll method is used to remove and retrieve elements from the queue in the order they were added.

By understanding the basics of queues and how to implement them in Java, we can now move on to exploring different queue implementations and their advantages and disadvantages.

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class Main {

  public static void main(String[] args) {

    // Replace with your Java logic here

    Queue<String> queue = new LinkedList<>();

​

    // Enqueue elements

    queue.add("Apple");

    queue.add("Banana");

    queue.add("Orange");

​

    // Dequeue elements

    while (!queue.isEmpty()) {

      String element = queue.poll();

      System.out.println(element);

    }

  }

}