Java

public class mainClass{
        public static void main(String[] args){
                System.out.println("I am a main class.");
                book sample1 = new book();
                copier sample2 = new copier("This",16,"That");
                copier sample3 = new copier("That",17,"Unknown");
        }
}

class copier{
        copier(book b){
                this.book_name = b.book_name;
                this.price = b.price;
                this.type = b.type;
        }

        copier(String name, double price, String type){
                this.name = name;
        }
}

class book{
        String book_name="This one";
        double price=16;
        String type="Science";
}