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<h3>Java Queue Interface</h3>
<p>In this tutorial, we will learn about Queue Interface and it's methods in Java.</h4>
<p>Java Collection frameworks provide Queue Interface which works on Queue data structure.It is present in java.util package and it implements Collection Interface.It works on the principle of First-In-First-Out(FIFO).</p>
<h4>Characteristics of a Queue:</h4>
<p>The following are the characteristics of the queue:</p>
<ul>
<li>The Queue is used to insert elements at the end of the queue and removes from the beginning of the queue. It follows FIFO concept.</li>
<li>The Java Queue supports all methods of Collection interface including insertion, deletion etc.</li>
<li>If any null operation is performed on BlockingQueues, NullPointerException is thrown.</li>
<li>The Queues which are available in java.util package are Unbounded Queues.</li>
<li>The Queues which are available in java.util.concurrent package are the Bounded Queues.</li>
<li>All Queues except the Deques supports insertion and removal at the tail and head of the queue respectively. The Deques support element insertion and removal at both ends.</li>
</ul>
<h4>Derived classes of Queue Interface</h4>
<p>We can not create objects of an interface so we need derived-classes to create objects.So Java provided us 3 derived classes for our use.They are :</p>
<ol><li><strong><a href="priority-queue-java.html">PriorityQueue</a></strong></li>
<li><strong><a href="linked-list-java.html">LinkedList</a></strong></li>
<li><strong><a href="array-deque-java.html">ArrayDeque</a></strong></li></ol>
<h4>Sub-Interfaces of Queue Interface</h4>
<ol><li><strong><a href="deque-interface-java.html">Deque</a></strong></li>
<li><strong><a href="blocking-queue-interface-java.html">BlockingQueue</a></strong></li>
<li><strong>BlockingDeque</strong></li></ol>
<h4>Methods of Queue Interface</h4>
<p>Some of the commonly used methods of the Queue interface are:</p>
<table border=2><tr><th>Methods</th><th>Description</th></tr>
<tr><td>add():</td><td> It inserts the given element into the queue and return true.</td></tr>
<tr><td>offer():</td><td> It inserts the given element into the queue and return true.</td></tr>
<tr><td>element():</td><td> It returns the head of the queue. It throws an exception if the queue is empty.</td></tr>
<tr><td>peek():</td><td>It returns the head of the queue and returns null if the queue is empty.</td></tr>
<tr><td>remove():</td><td> It returns and removes the head of the queue.It throws exception if found empty.</td></tr>
<tr><td>poll():</td><td> It returns and removes the head of the queue. Returns null if the queue is empty.</td></tr></table>
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