ArrayBlockingQueue is one implementation of the java.util.concurrent.BlockingQueue which internally store the queue elements inside an array. The ArrayBlockingQueue can store elements for the size defined when the object is initialized, by the constructor. Once it size is defined it cannot be change or resize.

The code snippet below demonstrate the ArrayBlockingQueue class. We initialize the queue to allow its internal array to store maximum of 64 elements.

package org.kodejava.example.util.concurrent;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

public class ArrayBlockingQueueExample {
    private BlockingQueue<String> sharedQueue = new ArrayBlockingQueue<>(64);

    public static void main(String[] args) {
        new ArrayBlockingQueueExample().createProducerConsumer();
    }

    private void createProducerConsumer() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    System.out.println(Thread.currentThread().getName());
                    try {
                        sharedQueue.put("DATA");
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }, "Producer Thread").start();

        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    System.out.print(Thread.currentThread().getName() + "=> ");
                    try {
                        System.out.println(sharedQueue.take());
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }, "Consumer Thread-1").start();
    }
}

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Wayan Saryada

Programmer, runner, recreational diver, currently living in the island of Bali, Indonesia. Mostly programming in Java, creating web based application with Spring Framework, Hibernate / JPA.

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