Remaining Time: 14 minutes, 10 seconds.Question Completion Status:QUESTION 1What is the scope of a private instanceable?All classes in the same package as the class in which the variable is defined.Only the method in which the variable is defined.The entire class in which the variable is defined.The entireprogram.QUESTION 2When an ohiect is created it wilL fin

The class's instance variables are shared by all of the class's methods and can be marked as public…

Answered: What is the scope of a private instance…

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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Note: Question of Object-oriented programming
If the programmer doesn't declare any constructors for an extended class, what constructors will be inherited from the superclass? How does this inherited constructor initialize new instance variables that are not part of the superclass? Suppose that Vehicle is a class and Car is a new class that extends Vehicle. Write a description of which kind of assignments are permitted between Car and Vehicle variables. Suppose you write a new constructor for an extended class. Describe two different ways that the superclass's instance variables could be initialized within the constructor for the extended class.
Draw the following Class Structure as a (class digram): 1. NotificationSystem: This is the main class that manages the notification system. It has the following attributes and methods: - Attributes: - users: a list of User objects representing all the users registered in the system - tweets: a list of Tweet objects representing all the tweets posted in the system - Methods: - register_user(user): adds a new user to the system - post_tweet(user, message): posts a new tweet on behalf of a user - get_timeline(user): returns a list of tweets from all users that the specified user follows - get_mentions(user): returns a list of tweets that mention the specified user 2. User: This class represents a user in the system. It has the following attributes and methods: - Attributes: - username: a string representing the username of the user - followers: a list of User objects representing all users who follow this user - following: a list of User objects representing all…
If class A is a subclass of class B, then A has access to all of B's instance variables, including private ones. True False
Suppose we have an program which is a Human Resources system used to hire and track new employees. One class in the program is the Employee class. Other classes include Payroll, Supplies, Vendors and Trainers. Consider just the Employee class itself. Which of the following data fields and methods would be appropriate to include in the Employee class and any classes extended from Employee? Hint: Think about object oriented design principles, and locating data fields and methods in classes to which they directly belong and associate to. O first name O hire date O Office Address O Company Lax ID O Supplier tax ID O Vendor Invoices O birth date O employe ID number
The class object is added to the class object. When a state change is recognized, the method in the interface is called. The ConcreteObserver the Observer interface.
Explain........... A method defined within a class and whose header does NOT include the static modifier is known as which of the following? a class method b instance method c super method d private method e public method

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What is the scope of a private instance variable? O All classes in the same package as the class in which the variable is defined. O Only the method in which the variable is defined. The entire class in which the variable is defined. The entire program.