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PriorityQueue iterator() Method in Java

Last Updated : 10 Dec, 2018

The Java.util.PriorityQueue.iterator() method is used to return an iterator of the same elements as the Priority Queue. The elements are returned in random order from what present in the Queue. Syntax:

Iterator iterate_value = Priority_Queue.iterator();

Parameters: The function does not take any parameter. Return Value: The method iterates over the elements of the queue and returns the values(iterators). Below programs illustrate the Java.util.PriorityQueue.iterator() method: Program 1:

Java

// Java code to illustrate iterator()
import java.util.*;

public class PriorityQueueDemo {
    public static void main(String args[])
    {
        // Creating an empty PriorityQueue
        PriorityQueue<String> queue = new PriorityQueue<String>();

        // Use add() method to add elements into the Queue
        queue.add("Welcome");
        queue.add("To");
        queue.add("Geeks");
        queue.add("4");
        queue.add("Geeks");

        // Displaying the PriorityQueue
        System.out.println("PriorityQueue: " + queue);

        // Creating an iterator
        Iterator value = queue.iterator();

        // Displaying the values after iterating through the queue
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

Output:

PriorityQueue: [4, Geeks, To, Welcome, Geeks]
The iterator values are: 
4
Geeks
To
Welcome
Geeks

Program 2:

Java

// Java code to illustrate iterator()
import java.util.*;

public class PriorityQueueDemo {
    public static void main(String args[])
    {
        // Creating an empty PriorityQueue
        PriorityQueue<Integer> queue = new PriorityQueue<Integer>();

        // Use add() method to add elements into the Queue
        queue.add(10);
        queue.add(15);
        queue.add(30);
        queue.add(20);
        queue.add(5);

        // Displaying the PriorityQueue
        System.out.println("PriorityQueue: " + queue);

        // Creating an iterator
        Iterator value = queue.iterator();

        // Displaying the values after iterating through the queue
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

Output:

PriorityQueue: [5, 10, 30, 20, 15]
The iterator values are: 
5
10
30
20
15

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