Chapter 11
Interfaces, Types, and Roles
Interfaces define a line between the specification of what an abstraction does and the implementation of how that abstraction does it. An interface is a collection of operations that are used to specify a service of a class or a component.
You use interfaces to visualize, specify, construct, and document the seams within your system. Types and roles provide a mechanism for you to model the static and dynamic conformance of an abstraction to an interface in a specific context.
A well-structured interface provides a clear separation ...
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