In this assignment you are to implement OOP principles you learned in a single mini project. 1. Define an interface Measurable. It has a single abstract method: double getArea(); 2. Define an abstract class Shape which has two fields: type and name both of type String. a. Provide constructor with a single input parameter: name. b. Provide accessor methods for both fields. c. Provide setter method for name. d. Provide toString() method that simply returns the "{type}: {name}" e. Shape class implements Measurable interface without implementing its only abstract method. 3. Define a concrete class Rectangle which extends the Shape class. a. It has width and height fields both of type double. b. Provide single constructor that takes three input parameters: name, width and height resp. C. Provide accessor methods for both fields. d. Implement the unimplemented method getArea() so that it returns the area of the rectangle object. e. Override toString() method so that it returns the following information: i. "{type}: {name} – [{width, height}]" e.g., rectangle: my_rect_1- [3.0, 5.0] Define a concrete clan

In this assignment you are to implement OOP principles you learned in a single mini project. 1. Define an interface Measurable. It has a single abstract method: double getArea(); 2. Define an abstract class Shape which has two fields: type and name both of type String. a. Provide constructor with a single input parameter: name. b. Provide accessor methods for both fields. c. Provide setter method for name. d. Provide toString() method that simply returns the "{type}: {name}" e. Shape class implements Measurable interface without implementing its only abstract method. 3. Define a concrete class Rectangle which extends the Shape class. a. It has width and height fields both of type double. b. Provide single constructor that takes three input parameters: name, width and height resp. C. Provide accessor methods for both fields. d. Implement the unimplemented method getArea() so that it returns the area of the rectangle object. e. Override toString() method so that it returns the following information: i. "{type}: {name} – [{width, height}]" e.g., rectangle: my_rect_1- [3.0, 5.0] Define a concrete clan

Microsoft Visual C#

7th Edition

ISBN:9781337102100

Author:Joyce, Farrell.

Publisher:Joyce, Farrell.

Chapter10: Introduction To Inheritance

Section: Chapter Questions

Problem 20RQ

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1. Define an interface Measurable. It has a single abstract method: double getArea(); 2. Define an abstract class Shape which has two fields: type and name both of type Strin a. Provide constructor with a single input parameter: name. b. Provide accessor methods for both fields. C. Provide setter method for name. d. Provide toString() method that simply returns the "(type): (name)" e. Shape class implements Measurable interface without implementing its only abs method. 3.
T/F1. However, implementation classes may be extended, but interface classes cannot.
Describe one advantage of requiring a class to implement an interface.
What is/are the differences between an abstract class and an interface? A class can implement multiple interfaces, but only extend one abstract class An interface can contain attributes None of the given All of the given Only interfaces can have default function implementations
Abstract classes and interfaces may be used interchangeably to specify the behavior of objects.How do you know whether you need an interface or an abstract class?
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
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What is the design pattern depicted in the diagram below? The intent of this design pattern is to define an interface for creating an object, but let subclasses decide which class to instantiate. It lets a class defer instantiation to subclasses. Client Abstraction normalMethodoe BmakeObjecto Product do some stuff aProduct = makeObjecto: f do some more stuff -aProduct Product ConcreteOne ConcreteTwo makeObjecto : Product ProductOne ProductTwo return new ProductOneo. A. Factory Method Design Pattern B. Singleton Design Pattern C. Proxy Design Pattern D. Adapter Design Pattern
When should one use an abstract class, when should one use an interface, and when should one use both?
Design a console program that will print details of prescribed textbooks of students. Make use of an abstract class Book with variables that will store the author, title, category and price of a book. Create a constructor that accepts the author, title and category through parameters and assign these to the class variables. Create an abstract set method for the price of a book; also create get methods for the variables.Create a subclass TextBook that extends the Book class and implements an iPrintable interface. The interface that must be added is shown below:public interface iPrintable { String DisplayDetails();}The TextBook subclass has a private variable named yearPrescribed for which a get method must be written. The constructor of the TextBook class must accept the author, title, category and yearPrescribed through parameters. Write the code for the setPrice() and DisplayDetails() methods.Write a useBook class and instantiate 2 objects of the TextBook class.
Which of these statements IS NOT true regarding design by contract. Question options: Creating and implementing an interface is an example of implicit design by contract. Explicit design by contract makes specifications part of the compiled code for a program. Creating and building from an abstract class is an example of explicit design by contract. When we code to an interface, we create a set of methods to be used to interact with a class; these methods establish a contract for how the design should work. Option B is not the correct answer.