QUESTION 17Which of the following are incorrect? (Choose all that applyA. You may declare a final abstract class.B. The constructors in an abstract class should be protectC. An abstract class contains constructors.D. An interface may contain constructors.E. The constructors in an abstract class are private.

We cannot make an abstract class as final because as we know a final class cannot be subclassed and…

Which of the following are incorrect? (Choose all that apply A. You may declare a final abstract class. B. The constructors in an abstract class should be protec C. An abstract class contains constructors. D. An interface may contain constructors. E. The constructors in an abstract class are private.

Which of the following are incorrect? (Choose all that apply A. You may declare a final abstract class. B. The constructors in an abstract class should be protec C. An abstract class contains constructors. D. An interface may contain constructors. E. The constructors in an abstract class are private.

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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OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is:

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(JAVA) What is the benefit of an abstract class? Group of answer choices A) There is a guarantee that all classes that inherit from the abstract class have the methods and fields of the abstract class. B) They cannot be instantiated, so you only need to write the code for the fields and methods that are common to all classes that extend it. You also need to initialize those fields in a constructor. C) All choices are correct. D) All classes that extend the abstract class will automatically inherit all the methods from the abstract classes without need to implement them again.
Which of the following is true regarding abstract classes or abstract methods? (Select all that apply) All methods in an abstract class must be overriden and implemented in any of its subclasses. Abstract classes only become useful when we create objects from them. Abstract classes only become useful when they are extended. Abstract methods must be overriden
(Java) The Abstract Art Class Write an abstract class as follows: The class is named Art It inherits from the Comparable interface It has a private String member variable named name It has a private String member variable named artist It has a private int member variable called year It has a default constructor that assigns the values "No name" to name, "No artist" to artist and -1 to the year. This default constructor calls the three argument constructor. It has a three-argument constructor to assign values to the name, artist and year variables. It has a copy constructor that makes a copy of another non-null Art object It has getters and setters for the name, artist and year variables It has a toString() method that creates a string of artist, with name and year tabbed once on subsequent lines (see sample output) It has an equals method that compares this Art to another Object It has a compareTo method that compares in this order: 1) artist, 2) name, 3) year This class contains no…
Which of the following statements are correct? (Select all that applies.) Group of answer choices a) Inheritance is the process by which one object can acquire the properties of another object. b) "super" is used to access the method or member variables from the parent class. c) Constructors are used to initialize a newly created object. d) Method overriding occurs when a child class declares a method that has the same type of arguments as a method declared by one of its parent classes. e) An object that has more than one form is referred to polymorphism.
Which ONE or MORE of the following, if any, ARE characteristics of Object-Oriented Programming? (you may select zero, one, or more than one choice) a. A class can be thought of as a category from which multiple "instances" or objects can be created. b. Flow of control is structured so that one function after another can manipulate data, which is available globally to all functions. c. Data and behaviors are grouped together in objects d. Object-Oriented Programming often results in "spaghetti code" that is hard to follow