What is the output of the following code snippet?

class Book {
    private String title = "Unknown";
    public Book(String title) {
        this.title = title;
    }
    void displayTitle() {
        System.out.println(title);
    }
}
public class Main {
    public static void main(String[] args) {
        Book book = new Book("Java Fundamentals");
        book.displayTitle();
    }
}