PriorityQueue iterator() Method in Java
Last Updated :
10 Dec, 2018
Improve
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:
Java
Java
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 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:
Program 2:
PriorityQueue: [4, Geeks, To, Welcome, Geeks] The iterator values are: 4 Geeks To Welcome Geeks
// 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
