What is Circular Queue in Java?In a standard queue data structure re-buffering problem occurs for each dequeue operation. To solve this problem by joining the front and rear ends of a queue to make the queue as a circular queueCircular queue is a. It follows principle. In circular queue the last node is connected back to the first node to make a circle.
Circular linked list fallow the First In First Out principle. Elements are added at the rear end and the elements are deleted at front end of the queue.
Both the front and the rear pointers points to the beginning of the array. It is also called as “Ring buffer”. Items can inserted and deleted from a queue in O(1) time.Program to implement Circular Queue in Java. $ javac CircularQ.java$ java CircularQEnter the size of the queue: 51: Add2: Delete3: Display4: ExitYour Choice: 1Enter number to be added: 311: Add2: Delete3: Display4: ExitYour Choice: 1Enter number to be added: 281: Add2: Delete3: Display4: ExitYour Choice: 1Enter number to be added: 91: Add2: Delete3: Display4: ExitYour Choice: 1Enter number to be added: 561: Add2: Delete3: Display4: ExitYour Choice: 3312891: Add2: Delete3: Display4: Exit.
Java Program To Implement Circular Queue Adt Using An Array
Prerequisite –Circular Queue is a linear data structure in which the operations are performed based on FIFO (First In First Out) principle and the last position is connected back to the first position to make a circle. It is also called ‘Ring Buffer’.In a normal Queue, we can insert elements until queue becomes full. But once queue becomes full, we can not insert the next element even if there is a space in front of queue.Operations on Circular Queue:. Front: Get the front item from queue. Rear: Get the last item from queue. enQueue(value) This function is used to insert an element into the circular queue.
In a circular queue, the new element is always inserted at Rear position.Steps:. Check whether queue is Full – Check ((rear SIZE-1 && front 0) (rear front-1)). If it is full then display Queue is full. If queue is not full then, check if (rear SIZE – 1 && front!= 0) if it is true then set rear=0 and insert element. deQueue This function is used to delete an element from the circular queue. In a circular queue, the element is always deleted from front position.Steps:. Check whether queue is Empty means check (front-1).
If it is empty then display Queue is empty. If queue is not empty then step 3. Check if (frontrear) if it is true then set front=rear= -1 else check if (frontsize-1), if it is true then set front=0 and return the element.