What is the PriorityQueue.iterator() method in Java?

Introduction

The PriorityQueue.iterator() method is present in the PriorityQueue class, inside the java.util package.

The PriorityQueue.iterator() method is used to return an iterator which can be used to iterate over all the elements in the PriorityQueue class.

Syntax

The syntax of the PriorityQueue.iterator() function is as follows:

public Iterator iterator();

Parameters

The PriorityQueue.iterator() method does not accept any parameters.

Return value

The PriorityQueue.iterator() method returns an iterator which is used to iterate over all the elements of the PriorityQueue class. The iterator does not iterate the elements in any specific order.

Code

Let’s look at the code now:

import java.util.*;
class Main 
{
  public static void main(String[] args)
  {
    PriorityQueue<Integer> p = new PriorityQueue<Integer>();
    p.add(2);
    p.add(28);
    p.add(6);
    p.add(80);
    p.add(28);
    p.add(7);
    p.add(15);
    Iterator i = p.iterator();
    System.out.print("The elements of priority queue are: ");
 
    while (i.hasNext()) 
      System.out.print(i.next() + " ");
  }
}

Code explanation

  • Line 1: We import the required package.
  • Line 2: We make a Main class.
  • Line 4: We make a main() function.
  • Line 6: We declare a PriorityQueue class that consists of Integer type elements.
  • Lines 8 to 14: We insert the elements in the PriorityQueue class by using the PriorityQueue.add() method.
  • Line 16: We declare an iterator for the PriorityQueue class, using the iterator() method.
  • Lines 20 to 21: We use a while loop to check the presence of the next element in the PriorityQueue class with the hasNext() method, and display the value of the iterator over each element.

This is how to use the PriorityQueue.iterator() method in Java.

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