Задачи | 5 уровень | 2 лекция

private String getOutputByBookType() {
            String agathaChristieOutput = author + ": " + getBook().getTitle() + " is a detective";
            String markTwainOutput = getBook().getTitle() + " was written by " + author;

            String output = "output";
            //Add your code here
            if (author.equals("Mark Twain")) output = markTwainOutput;
            else if (author.equals("Agatha Christie")) output = agathaChristieOutput;

            return output;
        }

if(this instanceof MarkTwainBook){
    output = markTwainOutput;
} else if (this instanceof AgathaChristieBook){
    output = agathaChristieOutput;
}