What is the result of compiling and running the following Java program?

public class Book {
    private static String genre;
    public void setGenre(String genre) {
        Book.genre = genre;
    }
    public static String getGenre() {
        return genre;
    }
    public static void main(String[] args) {
        Book book = new Book();
        book.setGenre("Science Fiction");
        System.out.println(Book.getGenre());
    }
}