![]() This method returns true if e was added and false otherwise.Ĥ. boolean offer(E e): It is used to insert the specified element e to the queue. It throws an exception named NoSuchElementException if the queue is empty.ģ. E element(): It is used to retrieve the element at the head of queue, but the element is not removed from the head of the queue. For simple FIFO queues, LinkedList and ArrayDeque classes are the best choices to create a queue.Ģ. Queue does not allow to add the null object.Ī Queue interface can be implemented in java by using either any one of four classes: LinkedList class, AbstractQueue class, PriorityQueue class, and ArrayDeque class.Elements can be added only from the back (tail) of the queue.Elements can be accessed and removed only from the front (head) of the queue.Java Queue interface orders elements in First In First Out policy.There are several interesting features of the queue in Java that is as follows: In the above syntax, E represents the type of objects that the set will hold. ![]() Queue is a generic interface that is declared in a general form as below: public interface Queue It provides all the normal functionalities of a queue. Out of these, ArrayDeque class is the best choice for simple FIFO queues. The hierarchy diagram of Queue interface in Java is shown below in the figure. ![]() ![]() It is the super interface of BlockingDeque, BlockingQueue, Deque, TransferQueue.Ī Queue interface is implemented by several classes such as LinkedList, AbstractQueue, ArrayBlockingQueue, ArrayDeque, and PriorityQueue. Java Queue interface extends the Collection interface. In the Java Collections Framework, a queue is represented by interface. ![]()
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