The Completed Book Class

There is one remaining class in our example, Book, which looks like this:

• Has a parent Goods.
• Adds a variable author.
• Is taxable.

You might wish to review the diagram that shows the relationships between the classes. Here is the usual blank-ridden class definition:

class Book   Goods  Taxable
{
  String  ;

  Book( String des, double pr, String auth)
  {
    super( des, pr );
      = auth ;
  }

  void display()
  {
    super.display() ;
    System.out.println( "author: " +  );
  }

  public double 
  {
    return price *  ;
  }
}

You might also wish to consult the Taxable interface.