Hackerrank’in 30 Days of Code içerisinde bulunan “Day 13: Abstract Classes” sorusunun açıklaması ve çözümü. Bu soruda abstract sınıflara ve base anahtar sözcüğüne göz attık.
► Hackerrank 30 Days of Code Çözümleri – Day 13: Abstract Classes: https://www.hackerrank.com/challenges/30-abstract-classes/problem
► Problem açıklaması:
Today, we will extend what we learned yesterday about Inheritance to Abstract Classes. Because this is a very specific object oriented concept, submissions are limited to the few languages that use this construct. Check out the Tutorial tab for learning materials and an instructional video.
Given a Book class and a Solution class, write a MyBook class that does the following:
Inherits from Book
Has a parameterized constructor taking these 3 parameters:
Implements the Book class’ abstract display() method so it prints these 3 lines:
Title , a space, and then the current instance’s title.
Author , a space, and then the current instance’s author.
Price , a space, and then the current instance’s price.
Note: Because these classes are being written in the same file, you must not use an access modifier (e.g.: public) when declaring MyBook or your code will not execute.
You are not responsible for reading any input from stdin. The Solution class creates a Book object and calls the MyBook class constructor (passing it the necessary arguments). It then calls the display method on the Book object.
Note: The $ is prepended to variable names to indicate they are placeholders for variables.
The following input from stdin is handled by the locked stub code in your editor:
The following output is printed by your display() method:
Title: The Alchemist
Author: Paulo Coelho