QUEUE JAVA DEFINITION MOVIE

Return a // following approach, explained above function dequeue - to remove data from queue function enqueue - to add data to queue declaring enqueue, dequeue and display functions * Below program is written in C++ language */

If the queue is not empty, then print the element at the head and increment the head.

If the queue is empty, then print underflow error and exit the program.

If the queue is not full, then increment the tail and add the element.

If the queue is full, then print overflow error and exit the program.

In approach there is no such overhead, but whenever we move head one position ahead, after removal of first element, the size on Queue is reduced by one space each time. In approach there is an overhead of shifting the elements one position forward every time we remove the first element. In approach we remove the element from head position and then move head to the next position. In approach, we remove the element at head position, and then one by one shift all the other elements in forward position. When we remove an element from Queue, we can follow two possible approaches (mentioned and in above diagram). As we add elements to the queue, the tail keeps on moving ahead, always pointing to the position where the next element will be inserted, while the head remains at the first index. Initially the head(FRONT) and the tail(REAR) of the queue points at the first index of the array (starting the index of array from 0). The easiest way of implementing a queue is by using an Array. Queue can be implemented using an Array, Stack or Linked List. The interrupts are handled in the same order as they arrive i.e First come first served.

Handling of interrupts in real-time systems.

In real life scenario, Call Center phone systems uses Queues to hold people calling them in an order, until a service representative is free.

Serving requests on a single shared resource, like a printer, CPU task scheduling etc.

Queue, as the name suggests is used whenever we need to manage any group of objects in an order in which the first one coming in, also gets out first while the others wait for their turn, like in the following scenarios:

peek( ) function is oftenly used to return the value of first element without dequeuing it.

Once a new element is inserted into the Queue, all the elements inserted before the new element in the queue must be removed, to remove the new element.

Queue is a FIFO( First in First Out ) structure.

Like stack, queue is also an ordered list of elements of similar data types.The process to add an element into queue is called Enqueue and the process of removal of an element from queue is called Dequeue. Data inserted first, will leave the queue first. Right? Same is the case with Queue data structure.

QUEUE JAVA DEFINITION MOVIE

If you go to a ticket counter to buy movie tickets, and are first in the queue, then you will be the first one to get the tickets. Which is exactly how queue system works in real world. This makes queue as FIFO(First in First Out) data structure, which means that element inserted first will be removed first. Queue is also an abstract data type or a linear data structure, just like stack data structure, in which the first element is inserted from one end called the REAR(also called tail), and the removal of existing element takes place from the other end called as FRONT(also called head).īefore you continue reading about queue data structure, check these topics before to understand it clearly:

Queue java definition