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<h3>Java PriorityQueue</h3>
<p>In this tutorial, we will learn about the PriorityQueue, its contructors and methods and how to implement it in Java.</h4>
<p>Java Collection frameworks provide PriorityQueue class and it implements Queue Interface.It provides the implementation of heap data structure.</p>
<p>Unlink Queues, the elements are retrieved in a sorted order in PriorityQueue.</p>
<h4>Constructors of the PriorityQueue</h4>
<table border=2><tr><th>Constructors</th><th>Description</th></tr>
<tr><td>PriorityQueue():</td><td> Creates a PriorityQueue with the default initial capacity (11) that orders its elements according to their natural ordering.</td></tr>
<tr><td>PriorityQueue(Collection<E> c):</td><td> Creates a PriorityQueue containing the elements in the specified collection.</td></tr>
<tr><td>PriorityQueue(int initialCapacity):</td><td> Creates a PriorityQueue with the specified initial capacity that orders its elements according to their natural ordering.</td></tr>
<tr><td>PriorityQueue(int initialCapacity, Comparator<E> comparator):</td><td> Creates a PriorityQueue with the specified initial capacity that orders its elements according to the specified comparator.</td></tr>
<tr><td>PriorityQueue(PriorityQueue<E> c):</td><td> Creates a PriorityQueue containing the elements in the specified priority queue.</td></tr>
<tr><td>PriorityQueue(SortedSet<E> c):</td><td> Creates a PriorityQueue containing the elements in the specified sorted set.</td></tr></table>
<h4>Methods of PriorityQueue</h4>
<p>Apart from the methods inherited from its parent class/interface ,it has following methods :</p>
<table border=2><tr><th>Methods</th><th>Description</th></tr>
<tr><td>boolean add(E element):</td><td> This method inserts the specified element into this priority queue.</td></tr>
<tr><td>public remove():</td><td> This method removes a single instance of the specified element from this queue, if it is present.</td></tr>
<tr><td>public poll():</td><td> This method retrieves and removes the head of this queue, or returns null if this queue is empty.</td></tr>
<tr><td>public peek():</td><td> This method retrieves, but does not remove, the head of this queue, or returns null if this queue is empty.</td></tr>
<tr><td>Iterator iterator():</td><td> Returns an iterator over the elements in this queue.</td></tr>
<tr><td>boolean contains(Object o):</td><td> This method returns true if this queue contains the specified element.</td></tr>
<tr><td>void clear():</td><td> This method is used to remove all of the contents of the priority queue.</td></tr>
<tr><td>boolean offer(E e):</td><td> This method is used to insert a specific element into the priority queue.</td></tr>
<tr><td>int size():</td><td> The method is used to return the number of elements present in the set.</td></tr>
<tr><td>toArray():</td><td> This method is used to return an array containing all of the elements in this queue.</td></tr>
<tr><td>Comparator comparator():</td><td> The method is used to return the comparator that can be used to order the elements of the queue.</td></tr></table>
<h4>Example</h4>
<pre><code>
import java.util.PriorityQueue;
import java.util.Iterator;
class Main
{
public static void main(String[] args)
{
// Creating a priority queue
PriorityQueue<Integer> integers = new PriorityQueue<>();
// Using the add() method
integers.add(4);
integers.add(2);
integers.add(16);
integers.add(11);
integers.add(28);
System.out.println("PriorityQueue: " + integers);
// Using the offer() method
integers.offer(1);
System.out.println("Updated PriorityQueue: " + integers);
// Using the peek() method
int number1 = integers.peek();
System.out.println("Accessed Element: " + number1);
// Using the remove() method
boolean result = integers.remove(2);
System.out.println("Is the element 2 removed? " + result);
// Using the poll() method
int number2 = integers.poll();
System.out.println("Removed Element Using poll(): " + number2);
//Using the iterator() method
Iterator<Integer> iterate = integers.iterator();
while(iterate.hasNext())
{
System.out.print(iterate.next()+" ");
}
}
}
<strong>Output:</strong>
PriorityQueue: [2, 4, 16, 11, 28]
Updated PriorityQueue: [1, 4, 2, 11, 28, 16]
Accessed Element: 1
Is the element 2 removed? true
Removed Element Using poll(): 1
4 11 16 28
</code></pre>
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