Java PriorityQueue remove() Method

The remove() method of PriorityQueue class removes a single instance of the specified element from this queue, only if it is present.

Syntax

Parameter

o - It is the element to be eliminated from this queue.

Specified By

The remove() method of the PriorityQueue class is specified by remove() method in interface Collection<E>.

Override

The remove() method of the PriorityQueue class is override by remove() method in class AbstractCollection<E>.

Return Value

The remove() method returns true if this queue is changed after the call.

Example 1

import java.util.PriorityQueue;

public class PriorityQueueRemoveExample1 {
public static void main(String[] args) {

PriorityQueue<String>Pqueue = new PriorityQueue<String>();

Pqueue.add("Amir");
Pqueue.add("Adam");
Pqueue.add("Chris");
Pqueue.add("Rafiq");
Pqueue.add("Ahana");

System.out.println("Queue before using remove() method :");

for (String value : Pqueue) {

System.out.println(value);
        } 
System.out.println("Queue after using remove() method :" +Pqueue.remove("Chris"));

for (String value : Pqueue) {
System.out.println(value);

          } 
      }
}

Test it Now

Output:

Queue before using remove() method :
Adam
Ahana
Chris
Rafiq
Amir
Queue after using remove() method :true
Adam
Ahana
Amir
Rafiq

Example 2

import java.util.PriorityQueue; 
public class PriorityQueueRemoveExample2 {

public static void main(String[] args) {

PriorityQueue<Integer>Pqueue = new PriorityQueue<Integer>();

Pqueue.add(98);
Pqueue.add(56);
Pqueue.add(45);
Pqueue.add(67);
Pqueue.add(73);

System.out.println("Queue before using remove() method :");
for (Integer number : Pqueue) {
System.out.println(number);
             }

System.out.println("Queue after using remove() method :" +Pqueue.remove(23));

for (Integer number : Pqueue) {
System.out.println(number);
             }
       }
}

Test it Now

Output:

Queue before using remove() method :
45
67
56
98
73
Queue after using remove() method :false
45
67
56
98
73

Example 3

import java.util.PriorityQueue;

class Patients implements Comparable{
    String name;
public Patients(String name) {
this.name = name;
    }
public String toString(){
return this.name;
    }
@Override
public int compareTo(Object o) {
return 0;
    }
}
public class PriorityQueueRemoveExample3 {
public static void main(String[] args) {
PriorityQueue<Patients>Pqueue = new  PriorityQueue<Patients>();
        Patients p1 =new Patients("Amar");
        Patients p2 =new Patients("Mukta");
        Patients p3 =new Patients("Aloke");
Pqueue.add(p1);
Pqueue.add(p2);
Pqueue.add(p3);
System.out.println("Patients are : "+Pqueue);
Pqueue.remove(p2);
System.out.println("Patients left : "+Pqueue);
    }
}

Test it Now

Output:

Patients are : [Amar, Mukta, Aloke]
Patients left : [Amar, Aloke]

Example 4

import java.util.PriorityQueue;

public class PriorityQueueRemoveExample4 {
public static void main(String[] args) {
PriorityQueue<Integer>Pqueue = new  PriorityQueue<Integer>();
Pqueue.add(1);
Pqueue.add(2);
Pqueue.add(3);
System.out.println("Elements in queue = "+Pqueue);
//if no value is provided then by default remove() method removes the head element.
System.out.println("Element removed = "+Pqueue.remove());
System.out.println("Elements left in queue = "+Pqueue);
System.out.println("Element removed = "+Pqueue.remove());
System.out.println("Elements left in queue = "+Pqueue);
    }
}

Test it Now

Output:

Elements in queue = [1, 2, 3]
Element removed = 1
Elements left in queue = [2, 3]
Element removed = 2
Elements left in queue = [3]

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