Глянул другие решения этой задачи, вроде вместо обращения к книге через getBook просто используют this, хотел узнать, то как я делаю не верно и криво, или валидатор просто так заточен? Вывод у программы правильный.
package com.javarush.task.task15.task1504;
import java.util.LinkedList;
import java.util.List;
/*
ООП - книги
*/
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(Book book) {
String output = "output";
if (book instanceof AgathaChristieBook){
String agathaChristieOutput = author + ": " + getBook().getTitle() + " is a detective";
return agathaChristieOutput;
}
if(book instanceof MarkTwainBook) {
String markTwainOutput = getBook().getTitle() + " was written by " + author;
return markTwainOutput;
}
else return null;
//Add your code here
}
public String toString() {
return getOutputByBookType(this.getBook());
}
}
public static class MarkTwainBook extends Book{
public String title;
public MarkTwainBook( String title) {
super("Mark Twain");
this.title = title;
}
@Override
public MarkTwainBook getBook() {
return this;
}
@Override
public String getTitle() {
return this.title;
}
}
public static class AgathaChristieBook extends Book{
public String title;
public AgathaChristieBook(String title) {
super("Agatha Christie");
this.title = title;
}
@Override
public AgathaChristieBook getBook() {
return this;
}
@Override
public String getTitle() {
return this.title;
}
}
}