Java PriorityQueue add() method

The add() method of the PriorityQueue class is used to insert the specified element into this priority queue.

Syntax

Parameter

e - It is the element to be added

Override

The add() method of class PriorityQueue overrides the add() method of class AbstractQueue<E>.

Return Value

The add() method returns true(as specified by Collection.add(E)).

Throws

The add() method throws :

ClassCastException - if the elements in this priority queue are not comparable with the specified element according to the priority queue's ordering.
NullPointerException - if the specified element is null.

Example 1

import java.util.PriorityQueue;

public class JavaPriorityQueueaddMethodExample1 {
public static void main(String[] args) {
PriorityQueue<String>pQueue =
new PriorityQueue<String>();
// Adding items to the pQueue using add()
pQueue.add("C");
pQueue.add("C++");
pQueue.add("Java");
pQueue.add("Python");
// Printing the elements of pQueue
for (String value :pQueue) {
System.out.println("Course : " + value);
        }
    }
}

Test it Now

Output:

Course : C
Course : C++
Course : Java
Course : Python

Example 2

import java.util.PriorityQueue;

class Student extends Object implements Comparable< Student>{

    String rollNo, name,course;

int age;

public Student(String rollNo, String name, String course,int age) {

this.rollNo= rollNo;

this.name = name;

this.course= course;

this.age= age;
    }

@Override

public int compareTo(Student o) {

return 0;
     }
 }

public class JavaPriorityQueueaddMethodExample2 {

static int i =1;

public static void main(String[] args) {

PriorityQueue<Student>pQueue = new PriorityQueue<>();

        Student val1 = new Student("2","ravi","C",21);

        Student val2 = new Student("1","Geetanjali","Java",21);

        Student val3 = new Student("3","Himanshu Bhardwaj","C++",21);

// Adding items to the pQueue using add()

pQueue.add(val1);

pQueue.add(val2);

pQueue.add(val3);

for(Student xyz:pQueue){

System.out.println(i++ +" Roll No = "+xyz.rollNo+"\n Name = "+xyz.name +"\n Course = "

+xyz.course+"\n Age = "+xyz.age+"\n");

       }
    }
}

Test it Now

Output:

1 Roll No = 2
 Name = ravi
 Course = C
 Age = 21

2 Roll No = 1
 Name = Geetanjali
 Course = Java
 Age = 21

3 Roll No = 3
 Name = HimanshuBhardwaj
 Course = C++
 Age = 21

Example 3

import java.util.Collections;
import java.util.PriorityQueue;

public class JavaPriorityQueueaddMethodExample3 {

public static void main(String[] args) {
Integer[] val = {0,1};
PriorityQueue<Integer>pQueue = new PriorityQueue<>();

// Adding items to the pQueue using add()

pQueue.add(7118);

pQueue.add(800);

pQueue.add(1178);

pQueue.add(1190);

System.out.println("Elements are : ");

for(Integer i:pQueue){

System.out.println(i);

val[0] = Collections.max(pQueue);

val[1]=Collections.min(pQueue);
          }

System.out.println("Max element = "+ val[0]);

System.out.println("Min element = "+ val[1]);
        }
    }

Test it Now

Output:

Elements are :
800
1190
1178
7118
Max element = 7118
Min element = 800

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Java PriorityQueue Class

Java PriorityQueue add() method

Syntax

Parameter

Override

Return Value

Throws

Example 1

Example 2

Example 3

Help Others, Please Share

Javatpoint Services

Training For College Campus