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…

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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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pls help me using python This is the code it provides: class Artist:# TODO: Define constructor with parameters to initialize instance attributes# (name, birth_year, death_year) # TODO: Define print_info() method. If death_year is -1, only print birth_year class Artwork:# TODO: Define constructor with parameters to initialize instance attributes# (title, year_created, artist) # TODO: Define print_info() method if __name__ == "__main__":user_artist_name = input()user_birth_year = int(input())user_death_year = int(input())user_title = input()user_year_created = int(input()) user_artist = Artist(user_artist_name, user_birth_year, user_death_year) new_artwork = Artwork(user_title, user_year_created, user_artist)new_artwork.print_info()
1.How do we gain access to private attributes outside of the class they are defined? Through public methods Through static methods Through private methods Through the class identifier 2. If you were designing a class called Point and the class had a static variable or function, which of the following would either define or use it correctly? self.x = x self.increaseNumPoints() def mystery(self, x, y): Point.numPoints += 1 3.To promote security and object ecapsulations, object attributes should be declared as: static protected private public 4. Two underscores ( __ ) will precede: public attributes private attributes public methods private methods Both public attributes and methods both private attributes and methods 5. Which of the following is required in a class to create unique…
It should be written in Python
A class called Book is designed to model a book written by one author. It contains:• Four private instance variables: name (String), author (of the class Author you have justcreated, assume that a book has one and only one author), price (double), and qty (int);• An __init__() to initialize the name, author, price, and qty with the given values;• Getters/Setters: getName(), getAuthor(), getPrice(), setPrice(), getQty(), setQty().• __str__() method that returns printable string of that object with the following format:"Book[name=?,Author[name=?,email=?,gender=?],price=?,qty=?".You should reuse Author’s __str__().Write the Book class (which uses the Author class written earlier). Also write a test drivercodeto test all the methods in the class Book. Take Note that you have to construct an instanceof Author before you can construct an instance of Book. E.g.,ahTeck = Author("Tan Ah Teck", "ahteck@nowhere.com", 'm') # Test the constructorprint(ahTeck) # Test __str__()dummyBook = Book("Java…
Question 6 Match the following: A constructor methods A class that contains no methods (other than constructors) that change any of the data in its object method name B. v modifier means that there are no restrictions on where an instance variable or method can be used c Accessor methods y hiding implementation details is done by marking data and methods as D Call-by-reference When we call a method in Java using class type parameters E Immutable class v Overloading is achieved when two or more methods in the same class have the same E Public G, private H method signatures
Which of the following statements are correct about the class in the OOP paradigm? (A) It is considered to be the blueprint of an object The object that will be produced out of the said class will have the same fields/variables, functions/methods, B and values It has a special method called a constructor. (D It has a special variable called a constructor. (E) None of the other choices are correct.
Note: Question of Object-oriented programming
Identify the cause of concern with the below piece of code. class Person (object): name = None def _init_(self, name) : Person.name = name def funct(self): return "Your name is " + self.name (1) Each Person's name will be equal to the most recently created Person's name. (2) Instantiating the object of class Person will lead to an error. (3) The name of every Person will be None. (4) Invoking funct on a person instance causes an error.
A class called Author (as shown in the class diagram) is designed to model a book's author. It contains: Three private instance variables: name (String), email (String), and gender (char of either 'm' or 'f'); One constructor to initialize the name, email and gender with the given values; public Author (String name, String email, char gender) {......} (There is no default constructor for Author, as there are no defaults for name, email and gender.) public getters/setters: getName(), getEmail(), setEmail(), and getGender();(There are no setters for name and gender, as these attributes cannot be changed.) A toString() method that returns string representation of author. A class called Book is designed (as shown in the class diagram) to model a book written by one author. It contains: Four private instance variables: name (String), author (of the class Author you have just created, assume that a book has one and only one author), price (double), and qty (int); Two constructors:…
QUESTION 2 What is the scope of a private instance variable? O Only the method in which the variable is defined. O The entire class in which the variable is defined. O All classes in the same package as the class in which the variable is defined. O The entire program. QUESTION 3 All Enumeration types are variable type O True O False QUESTION 4 A constructor cannot: O Specify return types or return values. O Initialize variables to their defaults. O Be overloaded. O Have the same name as the class. Click Save and Submit to save and submit. Click Save All Answers to save all answers. 33°C yub
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…

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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.