13. Book and Product example

• The Book class inherits Product and implements Printable:

  
  public class Book extends Product implements Printable
  {
      private String author;
  
      public Book(
          String code,
          String description,
          double price,
          String author )
      {
          super( code, description, price );
          this.author = author;
      }
      //...
      // implement the Printable interface
      public void print()  
      {
          System.out.println("Code:\t" + super.getCode());
          System.out.println(
              "Title:\t" + super.getDescription());
          System.out.println("Author:\t" + this.author);
          System.out.println(
              "Price:\t" + super.getFormattedPrice());
      }
  }//class Book