Java PriorityQueue comparator() Method

The comparator() method of PriorityQueue() class returns the comparator that is used to order the elements of this queue, or returns null if the elements of this queue are sorted according to natural ordering.

Syntax

Return Value

The comparator() method returns the comparator that is used to order this queue, or returns null if this queue is sorted according to natural ordering.

Example 1

import java.util.Comparator;
import java.util.PriorityQueue;

public class JavaPriorityQueueComparatorExample1 {

public static void main(String[] args) {

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

Pqueue.add(67);
Pqueue.add(89);
Pqueue.add(10);
Pqueue.add(100);

// here it will return null

Comparator comp = Pqueue.comparator();

System.out.println("Comparator value is = "+comp);
    }
}

Test it Now

Output:

Comparator value is = null

Example 2

import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.PriorityQueue;

class Student {
public String name;
public int marks;

Student(String name,int marks){

this.name=name;
this.marks=marks;
    }
public String toString(){

return this.name+" got "+ this.marks+" marks.";
    }
}     
class sort implements Comparator<Student>{

@Override

public int compare(Student a, Student b) {
if(a.marks<b.marks)
return 1;
else if(a.marks>b.marks)
return-1;
return 0;
         }
     }

public class JavaPriorityQueueComparatorExample2 {

public static void main(String[] args) {

        Student student1 = new Student("Ram", 98);
        Student student2 = new Student("Rahul", 19);
        Student student3 = new Student("Himanshu", 78);
        Student student4 = new Student("Geetanjali", 18);

PriorityQueue<Student>Pqueue = new PriorityQueue<Student>(5,new sort());

Pqueue.add(student1);
Pqueue.add(student2);
Pqueue.add(student3);
Pqueue.add(student4);

for(Student xyz:Pqueue){

System.out.println(xyz);
        }
         Comparator comp =Pqueue.comparator();

System.out.println("\nComparator value is "+comp);
    }
}

Test it Now

Output:

Ram got 98 marks.
Rahul got 19 marks.
Himanshu got 78 marks.
Geetanjali got 18 marks.

Comparator value is [email protected]

Next TopicJava PriorityQueue

← prev next →

Help Others, Please Share

Javatpoint Services

JavaTpoint offers too many high quality services. Mail us on [email protected], to get more information about given services.

Website Designing
Website Development
Java Development
PHP Development
WordPress
Graphic Designing
Logo
Digital Marketing
On Page and Off Page SEO
PPC
Content Development
Corporate Training
Classroom and Online Training
Data Entry

Training For College Campus

JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at [email protected]
Duration: 1 week to 2 week

^{Like/Subscribe us for latest updates or newsletter}

Java PriorityQueue Class