24. Adapter

• Problem to solve:

  • We need an interface of an abstract class Base.

  • We already have another class named Done that implements the needed behavior.

  • Unfortunately, class Done has the wrong interface, incompatible with Base.

• Solution:

  1. Derive new class named Adapter from the Base.

  2. Add Done object as a member to the Adapter class.

  3. Use thin layer of code around Done object to implement the desired Base interface.