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Java PriorityQueue add() Method with Example

PriorityQueue Class add() method: Here, we are going to learn about the add() method of PriorityQueue Class with its syntax and example.
Submitted by Preeti Jain, on March 11, 2020

PriorityQueue Class add() method

• add() method is available in java.util package.
• add() method is used to add the given element (ele) into a priority queue.
• add() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• add() method may throw an exception at the time of adding an element.
  • ClassCastException: This exception may throw when the given element is incompatible to compare with others.
  • NullPointerException: This exception may throw when the given parameter is null exists.

Syntax:

    public boolean add(Element ele);

Parameter(s):

• Element ele – represents the element (ele) to be inserted.

Return value:

The return type of the method is boolean, it returns true when the given element is to be inserted successfully otherwise it returns false.

Example:

// Java program to demonstrate the example 
// of boolean add(Element ele) method of 
// PriorityQueue

import java.util.*;
public class AddOfPriorityQueue {
    public static void main(String args[]) {
        // Instantiate PriorityQueue
        PriorityQueue < String > pq = new PriorityQueue < String > ();

        // By using add() method is add
        // the given element into priority
        // queue
        pq.add("C");
        pq.add("C++");
        pq.add("JAVA");
        pq.add("PHP");
        pq.add("ANDROID");

        // Display PriorityQueue
        System.out.println("PriorityQueue: " + pq);
    }
}

Output

PriorityQueue: [ANDROID, C, JAVA, PHP, C++]