Starting Out with Java: From Control Structures through Data Structures (4th Edition) (What's New in Computer Science)
Starting Out with Java: From Control Structures through Data Structures (4th Edition) (What's New in Computer Science)
4th Edition
ISBN: 9780134787961
Author: Tony Gaddis, Godfrey Muganda
Publisher: PEARSON
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Chapter 20.6, Problem 20.6CP
Program Plan Intro

Queue:

The queue is a linear data structure used to store a set of data and is the collection of data that uses FIFO (first-in-first-out) order for performing operations.

  • The queue is opened at its both ends. One end is for inserting items to the queue called a “rear” end and the other end is for removing the items from the queue called a “front” end.
  • The two basic operations done on a queue data structure are,
    • enqueue() – add an item to queue.
    • dequeue() – remove an item from the queue.
  • When the “enqueue()” method is invoked, it checks whether the queue is full or not. If the queue is full, it throws an exception.
    • If the queue has slots available, then element is added at the rear end.
  • When the “dequeue()” method is invoked on a queue, it checks whether the queue is empty or not. If queue is empty, it throws the exception.
    • If the queue is not empty, then elements are deleted from the front end in first-in-first-out order.

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