Chapter 6. Bridge
The BRIDGE pattern focuses on the design of an abstraction. The word abstraction refers to a class that relies on a set of abstract operations, where there are several possible implementations of the set of abstract operations.
The ordinary way to implement an abstraction is to create a class hierarchy with an abstract class at the top that defines the abstract operations; each subclass in the hierarchy provides a different implementation of the set of abstract operations. However, this approach becomes insufficient when you need to subclass the hierarchy for some other reason.
You can create a bridge by moving the set of abstract operations to an interface, so that an abstraction will depend on an implementation of the interface. ...
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