Java Collections - PriorityQueue.add() Examples

[Last Updated: Nov 8, 2025]

Class:

java.util.PriorityQueue

Method:

public boolean add(E e)

Inserts the specified element into this priority queue. Call to this method is forwarded to offer() method.

Examples

package com.logicbig.example.priorityqueue;

import java.util.PriorityQueue;

public class AddExample {

    public static void main(String... args) {
        PriorityQueue<String> pq = new PriorityQueue<>();
        pq.add("one");
        pq.add("two");
        System.out.println(pq);
    }
}

Output

[one, two]

PriorityQueue does not allow null elements:

package com.logicbig.example.priorityqueue;

import java.util.PriorityQueue;

public class AddExample2 {

    public static void main(String... args) {
        PriorityQueue<String> pq = new PriorityQueue<>();
        pq.add(null);
    }
}

Output

java.lang.NullPointerException
    at java.util.PriorityQueue.offer (PriorityQueue.java:336)
    at java.util.PriorityQueue.add (PriorityQueue.java:322)
    at com.logicbig.example.priorityqueue.AddExample2.main (AddExample2.java:15)

Java Collections - PriorityQueue.add() Examples

Class:

Method:

Examples

Output

Output

See Also