Exercise: LayeredLibrary needs more features

This exercise is about adding more features to the LayeredLibrary.

The aspects listed below can be done in any order - your choice.

Model interface

The model classes (at the moment there is only Book) should be exposed only through an interface.

• Extra an interface (named IBook).
• Use IBook (not Book) whereever possble in other classes.
• Make the Book class non-public.

Bigger library: More GUI etc.

We should be able to do CRUD (Create, Read, Update and Delete) on books.

Bigger library: More model classes

We need more model classes (and interfaces) + GUI to handle it.

• Borrower
• Loan
• Reservation
• others?

More implementations of the interface IDataAccessObject

• Getting data SQL database of your choice
• Getting data from a server using plain socket, web services, or ...