Java Queue: FIFO Data Structure & Implementation Guide

In Java, a Queue is a data structure that follows the First-In-First-Out (FIFO) principle. It is an interface that is a part of the Java Collections Framework. \u000a\u000aSome common implementations of the Queue interface in Java include:\u000a\u000a1. LinkedList: A doubly-linked list that can be used as a Queue.\u000a2. ArrayDeque: A resizable array that can be used as a Queue.\u000a3. PriorityQueue: A Queue that orders its elements based on their natural ordering or a specified Comparator.\u000a\u000aHere is an example of how to use a LinkedList as a Queue in Java:\u000a\u000ajava\u000aimport java.util.LinkedList;\u000aimport java.util.Queue;\u000a\u000apublic class QueueExample {\u000a public static void main(String[] args) {\u000a Queue<String> queue = new LinkedList<>();\u000a\u000a // Adding elements to the Queue\u000a queue.add("Element 1");\u000a queue.add("Element 2");\u000a queue.add("Element 3");\u000a\u000a // Accessing and removing elements from the Queue\u000a String element = queue.poll();\u000a System.out.println("Removed element: " + element);\u000a\u000a // Accessing the head of the Queue without removing it\u000a String head = queue.peek();\u000a System.out.println("Head of the Queue: " + head);\u000a\u000a // Checking if the Queue is empty\u000a boolean isEmpty = queue.isEmpty();\u000a System.out.println("Is the Queue empty? " + isEmpty);\u000a }\u000a}\u000a\u000a\u000aOutput:\u000a\u000aRemoved element: Element 1\u000aHead of the Queue: Element 2\u000aIs the Queue empty? false\u000a\u000a\u000aIn the example above, we create a Queue using a LinkedList implementation. We add elements to the Queue using the add() method. We then remove an element from the Queue using the poll() method, which returns and removes the head of the Queue. We access the head of the Queue without removing it using the peek() method. Finally, we check if the Queue is empty using the isEmpty() method.