It is oriented to multi-threaded execution, doesn’t allow zero elements and capacity could be limited. So it inherits the properties of the Deque interface. BlockingDeque such as BlockingQueue is a blocking queue, but bidirectional. Implementing classes of BlockingQueue interface: ArrayBlockingQueue, DelayQueue, LinkedBlockingDeque, LinkedBlockingQueue, LinkedTransferQueue, PriorityBlockingQueue, SynchronousQueue.īlockingDeque is a subinterface for BlockingQueue. Standard Blocking Queues include LinkedBlockingQueue, SynchronousQueue, and ArrayBlockingQueue. Sure, the concept of "full queue" implies that the queue has a limited size, which is usually specified in the constructor.
#Abstract queue java full#
Similarly, when a thread tries to put elements into a full queue, it waits until some other thread takes the elements out of the queue to get free space for the elements. When a thread tries to get items from an empty queue, it waits until some other thread puts the items into the queue. thread is trying to put elements in the full queue.thread is trying to get elements from an empty queue.Let's take a glimpse at these groups.ĭequesDeque means Double- Ended Queue and supports addition or removal from either tail of the data as a queue (first-in-first-out/FIFO) or from the head as another popular data structure called stack (last-in-first-out/LIFO).Ĭlasses that implement Deque Interface: ArrayDeque, ConcurrentLinkedDeque, LinkedBlockingDeque, LinkedList.īlocking QueuesA blocking queue is a queue that blocks a thread in two cases: You may divide them into 3 groups: Deques, Blocking Queues and Transfer Queues with BlockingDeque belonging to the two first. Subinterfaces of Java Queue Queue interface is inherited by 4 subinterfaces – BlockingDeque, BlockingQueue, Deque, TransferQueue. Object element() – retrieves, but doesn’t remove an element from the head of the queue.Object peek() – retrieves, but doesn’t remove an element from the head of the queue.Object remove() – retrieves and removes an element from the head of the queue.
According to Oracle documentation, Queue interface has 2 superinterfaces, 4 different interfaces that inherit from the queue, and an extremely impressive list of classes.īlockingDeque, BlockingQueue, Deque, TransferQueueĪbstractQueue, ArrayBlockingQueue, ArrayDeque, ConcurrentLinkedDeque, ConcurrentLinkedQueue, DelayQueue, LinkedBlockingDeque, LinkedBlockingQueue, LinkedList, LinkedTransferQueue, PriorityBlockingQueue, PriorityQueue, SynchronousQueue Queue in JavaQueue in Java is an interface. This is the main principle of classical queue data structure work. So, while working with a queue, new elements are added to the end, and if you want to get an element, it will be taken from the beginning. If the new customer comes, he/she will be the 5th in line to get hamburgers. If you have four people in line in McDonalds or elsewhere, the first to line up will be the first to get the store. The customer that came first, is going to be served first as well. It seems like a queue or a line of customers in real life. You may imagine Queue data structure very easily. That means you can add an element (or enqueue, put in the queue) only at the end of the structure, and take an element (dequeue or remove from the queue) only from its beginning. Queue data structureA Queue is a linear abstract data structure with the particular order of performing operations - First In First Out (FIFO). After that, we take a closer look at the most important implementations and learn them with examples. Also, what implementations of Queue are in Java language. You’ll find out what Queue data structure is, how it is represented in Java, what methods are the most important for all queues. Here we are going to discuss the Java Queue interface.
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