ArrayBlockingQueue size() Method in Java

To get the number of elements in the queue, use the size() method of the ArrayBlockingQueue class.

The syntax is as follows

int size()

To work with ArrayBlockingQueue class, you need to import the following package

import java.util.concurrent.ArrayBlockingQueue;

The following is an example to implement size() method of Java ArrayBlockingQueue class

Example

 Live Demo

import java.util.concurrent.ArrayBlockingQueue;
public class Demo {
   public static void main(String[] args) throws InterruptedException {
      ArrayBlockingQueue<Integer> q = new ArrayBlockingQueue<Integer>(10);
      q.add(200);
      q.add(310);
      q.add(400);
      q.add(450);
      q.add(500);
      q.add(550);
      q.add(700);
      System.out.println("ArrayBlockingQueue = " + q);
      System.out.println("The head of the queue = "+q.take());
      System.out.println("Number of elements in the queue = "+q.size());
      // adding more elements
      q.add(50);
      q.add(70);
      q.add(90);
      System.out.println("ArrayBlockingQueue = " + q);
      System.out.println("The head of the queue = "+q.take());
      System.out.println("Number of elements in the queue = "+q.size());
   }
}

Output

ArrayBlockingQueue = [200, 310, 400, 450, 500, 550, 700]
The head of the queue = 200
Number of elements in the queue = 6
ArrayBlockingQueue = [310, 400, 450, 500, 550, 700, 50, 70, 90]
The head of the queue = 310
Number of elements in the queue = 8