HR30 Day 13: Abstract Classes

1 개요

Day 13: Abstract Classes

• https://www.hackerrank.com/challenges/30-abstract-classes/problem

해커랭크 30 Days of Code

문제	풀이
10-19 Day e
HR30 Day 10: Binary Numbers
HR30 Day 11: 2D Arrays
HR30 Day 12: Inheritance
HR30 Day 13: Abstract Classes
HR30 Day 14: Scope
HR30 Day 15: Linked List
HR30 Day 16: Exceptions - String to Integer
HR30 Day 17: More Exceptions
HR30 Day 18: Queues and Stacks
HR30 Day 19: Interfaces

2 Java

HR30 Day 13: Abstract Classes/Java 문서를 참고하십시오.

class MyBook extends Book {
    int price;
    MyBook(String title, String author, int price) {
        super(title, author);
        this.price = price;
    }
    public void display() {
        System.out.printf("Title: %s\n", this.title);
        System.out.printf("Author: %s\n", this.author);
        System.out.printf("Price: %d\n", this.price);
    }
}

3 PHP

HR30 Day 13: Abstract Classes/PHP 문서를 참고하십시오.

class MyBook extends Book
{
    protected $price;
    function __construct($title, $author, $price) {
        parent::__construct(trim($title), trim($author));
        $this->price = $price;
    }
    function display() {
        echo 'Title: ' . $this->title . "\n";
        echo 'Author: ' . $this->author . "\n";
        echo 'Price: ' . $this->price . "\n";
    }
}