PriorityBlockingQueue put() method in Java

The put(E e) method of PriorityBlockingQueue is used to add an element into this queue. This method inserts the specified element into this priority queue. Since the queue is unbounded, this method will be never be blocked.

Syntax:

public void put(E e)

Parameter: This method accepts a mandatory parameter e which is the element to be inserted in PriorityBlockingQueue.



Return Value: The method does not return anything.

Exception: This method throws following excpetions:

  • ClassCastException – if the specified element cannot be compared with elements currently in the priority queue according to the priority queue’s ordering.
  • NullPointerException – if the specified element is null.

Below programs illustrate put() method in PriorityBlockingQueue:

Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program Demonstrate put(E e)
// method of PriorityBlockingQueue
  
import java.util.concurrent.PriorityBlockingQueue;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<Integer> pbq
            = new PriorityBlockingQueue<Integer>();
  
        // Add element using put() method
        pbq.put(1);
        pbq.put(2);
        pbq.put(3);
        pbq.put(4);
  
        // print elements of queue
        System.out.println("Queue: " + pbq);
    }
}

chevron_right


Output:

Queue: [1, 2, 3, 4]

Program 2: To demonstrate NullPointerException

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program Demonstrate put(E e)
// method of PriorityBlockingQueue
  
import java.util.concurrent.PriorityBlockingQueue;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<String> pbq
            = new PriorityBlockingQueue<String>();
  
        // try to put null value in put method
        try {
            pbq.put(null);
        }
        catch (Exception e) {
            // print error details
            System.out.println("Exception: " + e);
        }
    }
}

chevron_right


Output:

Exception: java.lang.NullPointerException


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.