It is the ability of an object to have many forms? Select one: O a. Interface O b. Polymorphism O c. Inheritance O d. Abstraction O e. None of these Clear my choice Which of the following class declaration is not allowed to be inherited? Select one: O a. class Person{} O b. None of these O c. public class Person {} O d. public abstract class Person {} e. public final class Person {}

It is the ability of an object to have many forms? Select one: O a. Interface O b. Polymorphism O c. Inheritance O d. Abstraction O e. None of these Clear my choice Which of the following class declaration is not allowed to be inherited? Select one: O a. class Person{} O b. None of these O c. public class Person {} O d. public abstract class Person {} e. public final class Person {}

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 8 An cannot be instantiated, they act as place holders for abstraction. O a. Abstract class O b. Subclass O C. Superclass O d. Parent class
In order to qualify as a subclass of an abstract class, a class must offer concrete implementations for all of the abstract methods defined in the abstract parent class. Exactly how do you feel about this?
1). Write a java abstract class called Solid and you will derive two classes – Cylinder and Sphere – from Solid. The class Solid Member variables type whose data type is String. For example, the type could be sphere, cube, parallelepiped. 2). The methods should include: A default or null constructor A constructor that initializes the value of type Getters and Setters An abstract method to find volume whose signature is public abstract double findVolume(); An abstract method to find surface area whose signature is public abstract double findSurfaceArea() a toString method that returns a string like the following Solid Type: Sphere an equals method that returns true if two Solid objects have the same type and false otherwise. 3). The class Cylinder - Cylinder will extend Solid Member variables: Cylinder inherits type from Solid radius of type double height of type double Methods: a default or null constructor a constructor that initializes type, radius, and height. type will always…
B and C are its subclasses, and A is the parent class. Now, B and C have certain similar features and methods, but B and C implement a number of their methods very differently. Use logic to specify if A is a concrete class, an abstract class, or an interface.
Define Abstract classes in C#. Vehicle and LandVehicle, a concrete class Auto and Interface Drivable according to the following UML diagram.
B1. Given the following classes, answer the below questions. 1. Person (abstract class) that has the following: Data Fields: private String name, private String address Constructor: Constructor to create a Person object with specified name and address. Methods: Accessor and mutator methods for all data fields. 2. Student (extend the class Person) that has the following: Data Fields: private int ID, private double grade Constructor: Constructor to create a Student object with specified name, address, ID & grade. Methods: Accessor and mutator methods for all data fields. 3. Director (extend the class Person) that has the following: Data Fields: private double salary. Constructor: Constructor to create a Director object with specified name, address, and salary. Methods: Accessor and mutator methods for salary data field. 4. GraduateStudent(extend the class Student) that has the following: Data Fields: - Constructor: Constructor to create a GraduateStudent object with specified name,…
State a circumstance in which you would prefer an interface over an abstract class. Also, State a circumstance in which you would prefer an abstract class over an interface.
Class A is the parent class, while classes B and C are the subclasses of A. Both B and C contain several features and techniques that are equivalent to one another; nevertheless, the implementations of some of their methods are quite different between the two. Explain what kind of class A will be using logic, whether it be a concrete class, an abstract class, or an interface.
Class A is composed of objects of class B, class B is extended by C& D. There should be a copy constructor in: A, B, C and D C and D only B only O B, C, and D
A subclass of an abstract class must provide concrete implementations for each of the parent class's abstract methods in order to be considered a subclass. What are your thoughts on this?