Which of the following is INCORRECT about abstract classes and interfaces? Select one: O Different classes that implement a given interface are similar. O Different classes that implement a given interface can be very different. O Different classes that extend a given abstract class are similar. O None of these options

Which of the following is INCORRECT about abstract classes and interfaces? Select one: O Different classes that implement a given interface are similar. O Different classes that implement a given interface can be very different. O Different classes that extend a given abstract class are similar. O None of these options

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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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.
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
A. Writing an Interface In this problem you will first write an interface and then modify classes to implement the interface. Write an interface, GeometricSolid, which has one method, volume. The volume method takes no arguments and returns a double. You are provided with three classes: Cylinder, Sphere, and RightCircularCone Modify the classes so that they implement the GeometricSolid interface. Supply the appropriate method for each class. You can use Google search to find the formula for the volume. Make sure that you use Math.PI in your calculations. Notice in InterfaceRunner that the objects are added to an ArrayList of GeometricSolids. since I couldn't fit all images with two screen shots I left the link here link: https://codecheck.it/files/18040616319p6jy6gzkdzuq08nmlp81251t
Which of the following statements is TRUE about interfaces? OAn interface can implement one or more interfaces. ONone of them OAn interface extends the class Object by default. () An interface can contain no more than one constructor. An interface must at least contain one abstract method.
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
Computer Science we have learned about interfaces knowledge. Interfaces are preferred to define a common supertype for unrelated classes. Interfaces are more flexible than classes. You may design and consider the Animal class , and then you may suppose the how To Eat method is defined in the Animal class.
Which of the following is true about abstract classes? Note that if a class can be sub-classed, this simply means that it can be derived from. Abstract classes can only contain abstract methods. They cannot be sub-classed. Abstract classes cannot be instantiated, but they can be sub-classed. Abstract classes can only contain abstract methods. They can be sub-classed. Abstract classes can be instantiated, but they cannot be sub-classed. Can an interface ever contain method bodies (i.e. content between {})? Unknown Yes No Sometimes
just mention the Anwsers. Explanation is not needed. Thank you
1. Create a Student class that implements the Person interface. As well as storing the students name and email, also store their course grade (e.g A, B, C) in a member variable. The grade should be accessible via a getGrade method. For the implementation of getDescription return a message along the lines of “A C grade student”, substituting the students actual grade.2. Create a Lecturer class that implements the Person interface. This class should also store the subject that the lecturer teaches. Add a getSubject method, and implement getDescription so that it returns a suitable message, e.g. “Teaches Biology”.3. Create a third class, Employee that implements the interface. This should also store the name of the department the Employee works in (available via getDepartment). Again, getDescription should return a suitable message.
This example asks you to write an interface. Then define three classes that implement this interface. 1) Create an interface Discount Policy. It should have a single abstract method called computeDiscount that will return the discount for the purchase of a given number of a single item. The method has two parameters, count and item Cost. This interface has no other method. 2) Define a class Bulk Discount that implements the interface Discount Policy, as de- scribed above. It should have a constructor that has two parameters, minimum and percent. It should define the method computeDiscount so that if the quantity purchased of an item is more than minimum, the discount is percent percent. 3) Define another class Buy NItemsGetOneFree that implements Discount Policy as de- scribed in part 1. The class should have a constructor that has a single parameter n. In addition, the class should define the method computeDiscount so that every nth item is free. For ex- ample, the following table…
You need to perform following things to demonstrate the concept of abstract class. Step 1: Create the abstract class that has following methods. • Calculate the area of circle(Abstract method) • Calculate the area of triangle(Abstract method) • Calculate the area of rectangle(Method with implementation) Step 2: Create another class that extends above class and provide implementation of abstract methods. Step 3: Create the main method inside above class and display output of area of circle, area of triangle and area of rectangle. You need to submit the following things: • Java program with both the classes An output screenshot created using Microsoft Word
T/F1. Interface classes cannot be extended but classes that implement interfaces can be extended.