1. Java Concurrency Utilities - java.util.concurrent
2. Java BlockingQueue
3. ArrayBlockingQueue
4. DelayQueue
5. LinkedBlockingQueue
6. PriorityBlockingQueue
7. SynchronousQueue
8. BlockingDeque
9. LinkedBlockingDeque
10. ConcurrentMap
11. ConcurrentNavigableMap
12. CountDownLatch
13. CyclicBarrier
14. Exchanger
15. Semaphore
16. Java ExecutorService
17. Java Callable
18. Java Future
19. ThreadPoolExecutor
20. ScheduledExecutorService
21. Java Fork and Join using ForkJoinPool
22. Java Lock
23. ReadWriteLock
24. AtomicBoolean
25. AtomicInteger
26. AtomicLong
27. AtomicReference
28. AtomicStampedReference
29. AtomicIntegerArray
30. AtomicLongArray
31. AtomicReferenceArray

The ArrayBlockingQueue class implements the BlockingQueue interface. Read the BlockingQueue text for more information about the interface.

ArrayBlockingQueue is a bounded, blocking queue that stores the elements internally in an array. That it is bounded means that it cannot store unlimited amounts of elements. There is an upper bound on the number of elements it can store at the same time. You set the upper bound at instantiation time, and after that it cannot be changed.

The ArrayBlockingQueue stores the elements internally in FIFO (First In, First Out) order. The head of the queue is the element which has been in queue the longest time, and the tail of the queue is the element which has been in the queue the shortest time.

Here is how to instantiate and use an ArrayBlockingQueue:

BlockingQueue queue = new ArrayBlockingQueue(1024);

queue.put("1");

Object object = queue.take();

Here is a BlockingQueue example that uses Java Generics. Notice how you can put and take String's instead of :

BlockingQueue<String> queue = new ArrayBlockingQueue<String>(1024);

queue.put("1");

String string = queue.take();