For each implementation, I recommend appropriate use cases. To implement a queue using array, create an array arr of size n and take two variables front and rear both of which will be initialized to 0 which means the queue is currently empty. First of all, the queue contains two pointers, rear, and front. This queue does not permit null elements. Since Queue is an interface you need to instantiate a concrete implementation of the interface in order to use it. Live Demo. A program that demonstrates queue in Java is given as follows − Example. This means that the elements entered first are the ones that are deleted first. Queue is an interface that extends Collection in Java. Which concurrent Queue implementation should I use in Java? Even in the implementations that permit it, null should not be inserted into a Queue , as null is also used as a special return value by the poll method to indicate that the queue contains no elements. Also, different operations are done at two different ends. The queue interface is provided in java.util package and it implements the Collection interface. From the JavaDocs: A ConcurrentLinkedQueue is an appropriate choice when many threads will share access to a common collection. In the previous article, we have seen the array implementation which can not be used for the large-scale applications where the queues are implemented. You can choose between the following Queue implementations in the Java Collections API: java.util.LinkedList; java.util.PriorityQueue; LinkedList is a pretty standard queue implementation. ArrayDeque. Active 2 years ago. Here, we have used the LinkedList class that implements the Queue interface. In this article, we will discuss the implementation of Queue using Linked List. In queue, insertion and deletion happen at the opposite ends, so implementation is not as simple as stack. 76. Viewed 111k times 134. One of the alternatives of array implementation is linked list implementation of a queue. Java Queue Implementations. Queue: [1, 2, 3] Removed Element: 1 Queue after deletion: [2, 3] In the above example, we have used the Queue interface to implement the queue in Java. To implement queue using Arrays, we first declare an array that will hold n number of queue elements. It has all the functions needed to support FIFO architecture.. For concrete implementation you may use LinkedList.LinkedList implements Deque which in turn implements Queue.All of these are a part of java.util package.. For details about method with sample example you can refer FIFO based Queue implementation in Java. Java Queue Array Implementation. The queue implements FIFO i.e. numbers.offer() - insert elements to the rear of the queue First In First Out. Queue implementation is not as straightforward as a stack implementation. 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