Goal: develop a class Queue, an ordered collection of objects that restricts insertions to the rear of the queue and removal from the front of the queue •The class Queue should support methods: Queue (): Constructor that initializes the queue to an empty queue enqueue (item) : Add item to the end of the queue • dequeue (): Remove and return the element at the front of the queue isEmpty(): Returns True if the queue is empty, False otherwise >>> appts Queue () >>> appts.enqueue ('John') >>> appts.enqueue ('Annie') >>> appts.enqueue ('Sandy') >>> appts.dequeue () 'John' >>> appts.dequeue () 'Annie' >>> appts.dequeue () 'Sandy' >>> appts.isEmpty() True

Goal: develop a class Queue, an ordered collection of objects that restricts insertions to the rear of the queue and removal from the front of the queue •The class Queue should support methods: Queue (): Constructor that initializes the queue to an empty queue enqueue (item) : Add item to the end of the queue • dequeue (): Remove and return the element at the front of the queue isEmpty(): Returns True if the queue is empty, False otherwise >>> appts Queue () >>> appts.enqueue ('John') >>> appts.enqueue ('Annie') >>> appts.enqueue ('Sandy') >>> appts.dequeue () 'John' >>> appts.dequeue () 'Annie' >>> appts.dequeue () 'Sandy' >>> appts.isEmpty() True

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Goal: develop a class Queue, an ordered collection of objects that restricts
insertions to the rear of the queue and removal from the front of the queue
•The class Queue should support methods:
•
●
Queue (): Constructor that initializes the queue to an empty queue
enqueue (item): Add item to the end of the queue
dequeue (): Remove and return the element at the front of the
queue
isEmpty(): Returns True if the queue is empty, False otherwise
appts Queue ()
>>> appts.enqueue ('John')
>>> appts.enqueue ('Annie')
>>> appts.enqueue ('Sandy')
>>> appts.dequeue ()
'John'
>>> appts.dequeue ()
'Annie'
>>> appts.dequeue ()
'Sandy'
>>> appts.isEmpty()
True

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