That is, when you reach the end of a queue, you start from the beginning of a queue. Additionally, this queue works by the process of circular incrementation. However, implementing a circular link is a new addition that you need to execute. You can implement the circular queue using both the 1-D array and the Linked list. Representation of Circular Queue using Arrays and a Linked List This operation takes place from the front of the Queue. deQueue() - Used to delete a value from the Circular Queue.This operation takes place from the end of the Queue. enQueue(value) - Used to insert a new value in the Circular Queue.Rear - Used to get the end element of the Circular Queue.Front - Used to get the starting element of the Circular Queue.The Circular Queue is similar to a Linear Queue in the sense that it follows the FIFO (First In First Out) principle but differs in the fact that the last position is connected to the first position, replicating a circle. Hence, it is also called a Ring Buffer.Īs shown in the illustration above, the circular queue resolves the memory wastage problem with the help of a circular link. What is Circular Queue in a Data Structure?Ī circular queue is an extended version of a linear queue as it follows the First In First Out principle with the exception that it connects the last node of a queue to its first by forming a circular link. Thus, this particular type of queue is considered the best version of a queue data structure. This simple addition of a circular link resolves the problem of memory wastage in the case of queue implementation. Hence, experts introduced the concept of the circular queue to overcome this limitation.Īs shown in the figure above, the rear pointer arrives at the beginning of a queue with the help of a circular link to re-utilize the empty space to insert a new element. In the case of a linear queue, when the rear pointer reaches the MaxSize of a queue, there might be a possibility that after a certain number of dequeue() operations, it will create an empty space at the start of a queue.Īdditionally, this newly created empty space can never be re-utilized as the rear pointer reaches the end of a queue. However, memory is a crucial resource that you should always protect by analyzing all the implications while designing algorithms or solutions. ![]() Implementation of a linear queue brings the drawback of memory wastage. Why Was the Concept of Circular Queue Introduced? In this tutorial, you will explore a circular queue in a data structure along with its implementation and applications. You use a circular queue as a buffer to store the processes in order of their insertion and then remove them at the time of resource allocation or execution. It is used to manage the execution of computing processes or programs. ("Item deleted from queue: " + queue.It is common to use circular queues in a data structure in operating systems. * retrieve queue element then increment */ Throw new RuntimeException("Queue is empty") * Checks whether the queue is empty or not */ * increment rear then insert element to queue */ * Checks whether the queue is full or not */ Java Program for Queue Implementation Using an Array Peek: Get a value from the front of the queue without having to remove it. Remove: To delete an item from the front of the queue. Insert: To add an item at the back / rear end of the queue. Queue Implementation in Javaįor a Queue-based system, the following three operations are used. Another alternative is to use a circular queue, with the front and back pointing to the beginning of the array after the maximum size has been achieved. To fill the gap, we can rearrange the remaining components to fill the space, but it is a time-consuming procedure. When elements are added to a queue and then deleted, a gap is created. When utilising an array to construct a queue, the fact that an array has a fixed size once declared poses an issue in the queue implementation. Items are added to the end of the line and removed from the beginning. QueueĪ queue is data structure that is based on first-in first-out (FIFO) in which the first item input is also the first item removed. Here, we have given a brief knowledge of the process of implementing a queue using an array. ![]() The queue is a type of data structure that can be implemented using an array or a linked list. Next → ← prev Implement Queue Using Array in Java
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