a String expression to represent an object's state. a. toString () b. abstract c. super () d. this () 11. The call in a class constructor invokes the superclass's constructor that has the corresponding argument list. a. tostring () b. abstract c. super () d. this() 12. The call to invokes the constructor for the current class whose parameter list matches the argument list. a. tostring () b. abstract c. super () d. this () 13. If no constructors are defined for a class, the constructor for that class will be provided by default. a. private b. super c. public d. no-argument 14. What is a keyword to declare a subclass to a super class in Java? a. implements b. extends c. throws d. follows

a String expression to represent an object's state. a. toString () b. abstract c. super () d. this () 11. The call in a class constructor invokes the superclass's constructor that has the corresponding argument list. a. tostring () b. abstract c. super () d. this() 12. The call to invokes the constructor for the current class whose parameter list matches the argument list. a. tostring () b. abstract c. super () d. this () 13. If no constructors are defined for a class, the constructor for that class will be provided by default. a. private b. super c. public d. no-argument 14. What is a keyword to declare a subclass to a super class in Java? a. implements b. extends c. throws d. follows

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

See similar textbooks

Similar questions

Draw the follClass Structure: 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 users whom this user follows -…
variables are variables that have the same name as variables that have been declared in a superclass and are declared in a subclass, respectively.
Java Programming Object-Oriented Programming In an abstract class, write a factory method for creating a category of object of your choice (aside from furniture). Also, write the class representing that category.b) Write the child classes that are necessary to create 3 different types of objects that belong to that category
The classes Name and Date are separate classes used as properties in the Employee class. Class Employee is the superclass of the classes SalariedEmployee and HourlyEmployee. The superclass has the attributes name and data of hire and methods to set and get these attributes. It also has 2 abstract methods equals() which check if the objects are same and toString() which convert the properties to a printable string. Also the method read() which used as an input method. The SalariedEmployee subclass has in addition to the attributes of the super-class the attribute annualSalary and set and get methods for it. This class also defines the read() method and grossPay() which in this case returns the salary of the employee. The HourlyEmployee subclass has in addition to the attributes of the super-class, the hoursWorked and hourlyRate attributes. It provides ‘get’ and ‘set’ methods for these attributes. Also it provides the methods equals() and toString(). Finally, it provides an…
Why is a destructor required for a class to implement?
is the word for the process of converting a member of one class into a member of another.
Distinguish between implementing an interface and implementing a derived class.
A single class can have many instances of that class it’s true or false
Class definitionDefine a class bankAccount to implement the basic properties of a bank account. Anobject of this class should store the following data: Account holder’s name (string) Account number (int) Account type (string, check/savings/business) Balance (double) Interest rate (double) – store interest rate as a decimal number. Add appropriate member functions to manipulate an object. Use a static member in theclass to automatically assign account numbers.
1. Create an interface OnlineQuiz with the following details: Member variables: totalMarks=10 Member Methods: · nQuestions(): An abstract method that calculates and return the number of questions. Defined in subclass. · display(): An abstract method that displays all details. Defined in a subclass. 2. Create a class Staff that inherits OnlineQuiz with the following details: Member variables: · staffD // id of the staff string type · staffName // Name of the staff string type · nMCQ // Number of MCQ type questions int type · nTF // Number of true/false type questions int type · nMatch // Number of match type questions int type Member Methods: · Define the parameterized constructor to set the member variables. · Define the method nQuestions(): which calculate and return the total number of questions. Total number of question= nMCQ + nTF +…
QUESTION 5 All methods in an abstract class must also be declared abstract. True False QUESTION 6 All fields declared in an interface are treated as final and static have protected access must be initialized in the class implementing the interface have private access
246. The process of forming a new class from an existing class. a. Abstraction b. Polymorphism c. Inheritance d. Implementation