Java PriorityQueue iterator() Method

The iterator() method of the PriorityQueue class returns an iterator over the elements in this queue.

The elements are not returned in any particular order by the iterator.

Syntax

Parameter

Specified By

The iterator() method of the PrioriryQueue class is specified by:

iterator() method in interface Collection<E>.
iterator() method in interface Iterable<E>.
iterator() method in class AbstractCollection<E>.

Return Value

The iterator() method returns an iterator over the elements in this queue.

Example 1

import java.util.PriorityQueue;
import java.util.Iterator;

public class JavaPriorityQueueIteratorExample1 {
public static void main(String[] args) {
	PriorityQueue<String>pQueue = new PriorityQueue<String>();
	pQueue.add("Elena");
	pQueue.add("Dominic");
	pQueue.add("Brian");
	pQueue.add("Letty");
	        Iterator<String>iterator = pQueue.iterator();
	//Returns an iterator over the elements
	while(iterator.hasNext()){
	System.out.println(iterator.next());
	        }
}
}

Test it Now

Output:

Brian
Elena
Dominic
Letty

Example 2

import java.util.Iterator;
import java.util.PriorityQueue;

public class JavaPriorityQueueIteratorExample2 {
public static void main(String[] args) {
PriorityQueue<Integer>Pqueue = new PriorityQueue<Integer>();
Pqueue.add(200);
Pqueue.add(780);
Pqueue.add(654);
Pqueue.add(1090);
        Iterator<Integer> iterator = Pqueue.iterator();
System.out.println("Ascending order :");
while(iterator.hasNext()){
System.out.print(iterator.next()+" ");

        }       
    }
}

Test it Now

Output:

Ascending order :
200 780 654 1090

Example 3

import java.util.Iterator;
import java.util.PriorityQueue;

class Attendance implements Comparable  {
private int rollNo;
private String name;

public Attendance( int rollNo,String name) {
this.rollNo= rollNo;
this.name = name;
    }
public String toString(){
return this.rollNo+" "+this.name;
    }

@Override
public int compareTo(Object o) {
return 0;
    }
}

public class JavaPriorityQueueIteratorExample3 {
public static void main(String[] args) {
        Attendance a1 = new Attendance(1, "Amit");
        Attendance a2 = new Attendance(2, "Simran");
        Attendance a3 = new Attendance(3, "Raj");
        Attendance a4 = new Attendance(4, "Barun");

PriorityQueue<Attendance>Pqueue = new PriorityQueue<Attendance>();
Pqueue.add(a1);
Pqueue.add(a2);
Pqueue.add(a3);
Pqueue.add(a4);
        Iterator<Attendance> iterator = Pqueue.iterator();
while(iterator.hasNext()){
System.out.println(iterator.next());
        }
    }
}

Test it Now

Output:

1 Amit
2 Simran
3 Raj
4 Barun

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Java PriorityQueue Class

Java PriorityQueue iterator() Method

Syntax

Parameter

Specified By

Return Value

Example 1

Example 2

Example 3

Help Others, Please Share

Javatpoint Services

Training For College Campus