I don't understand complier really((

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1. Create a public static class MarkTwainBook that inherits Book. Name of the author [Mark Twain].
The constructor parameter is the book title.
2. Implement all the abstract methods in the MarkTwainBook class.
3. Change the return type of the getBook method to make it more appropriate.
4. In a similar manner, create the AgathaChristieBook class. Name of the author [Agatha Christie].
5. In the Book class, implement the getOutputByBookType method so that it returns:
5.1. agathaChristieOutput for books written by Agatha Christie;
5.2. markTwainOutput for books written by Mark Twain.

Requirements:

The Solution class must contain the public static MarkTwainBook class.
The MarkTwainBook class must be a descendant of the Book class.
The MarkTwainBook class must correctly implement a constructor with one String parameter (book title).
The MarkTwainBook class constructor should call the constructor of the parent class (Book) with the argument "Mark Twain".
The getBook method in the MarkTwainBook class must have the MarkTwainBook return type and return the current object.
The Solution class must contain the public static AgathaChristieBook class.
The AgathaChristieBook class must be a descendant of the Book class.
The AgathaChristieBook class must correctly implement a constructor with one String parameter (book title).
The AgathaChristieBook class constructor should call the constructor of the parent class (Book) with the argument "Agatha Christie".
The getBook method in the AgathaChristieBook class must have the AgathaChristieBook return type and return the current object.
The getTitle method in the AgathaChristieBook and MarkTwainBook classes should return the title of a specific book.
The getOutputByBookType method must return the correct string for AgathaChristieBook objects.
The getOutputByBookType method must return the correct string for MarkTwainBook objects.
The MarkTwainBook class must have a String field title (book title).
The AgathaChristieBook class must have a String field title (book title).

package com.codegym.task.task15.task1504; import java.util.LinkedList; import java.util.List; /* OOP: Books */ public class Solution { public static void main(String[] args) { List<Book> books = new LinkedList<Book>(); books.add(new MarkTwainBook("Tom Sawyer")); books.add(new AgathaChristieBook("Hercule Poirot")); System.out.println(books); } abstract static class Book { private String author; public Book(String author) { this.author = author; } public abstract Book getBook(); public abstract String getTitle(); private String getOutputByBookType() { String agathaChristieOutput = author + ": " + getBook().getTitle() + " is a detective"; String markTwainOutput = getBook().getTitle() + " was written by " + author; String output = "output"; if (this instanceof MarkTwainBook){ output = markTwainOutput; } if (this instanceof AgathaChristieBook){ output = agathaChristieOutput; } return output; } public String toString() { return getOutputByBookType(); } } public static class MarkTwainBook extends Book{ private String title; private String name; MarkTwainBook(String name){ super("Mark Twain"); this.title = name; this.name = name; } public MarkTwainBook getBook(){ return this; } public String getTitle() { return this.title; } } public static class AgathaChristieBook extends Book{ private String title; private String name; public AgathaChristieBook(String name){ super("Agatha Christie"); this.title = name; this.name = name; } public AgathaChristieBook getBook(){ return this; } public String getTitle(){ return this.title; } } }

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Cinthya Cabanzo

Level 22 , Bogota, Colombia

14 June 2019, 23:10

Your code

MarkTwainBook(String name){
    super("Mark Twain");
    this.title = name;
    this.name = name;
}

You don't need to use this. name = name, because you use the name with super.

Ahmed

Level 23 , Amsterdam, Netherlands

28 May 2019, 14:53

Why do you have string name in your classes? You only need the title. And compare based on the author name:

if (getBook().author.equals("Mark Twain")) {

Bazsó Benjámin

Level 20 , Szombathely, Hungary

15 May 2019, 12:53

you dont need

private String name;