Book.java

class Book{
    String author;
    String title;
    int year;

    Book(String author, String title, int year){
        this.author = author;
        this.title = title;
        this.year = year;
    }

    public String toString(){
        return this.author + ";" + this.title + ";" + this.year;
    }

    boolean isOldest(Book book){
        if(this.year<book.year){
            return true;
        }
        return false;
    }
}