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Polymorphism: The ability to hide many different implementations behind a single interface.
Interfaces formalize polymorphism, support “plug-and-play” architectures.
A non-trivial, nearly independent, and replaceable part of a system that fulfills a clear function in the context of a well-defined architecture.
source code component, run time components, executable component
A combination of a package (can contain other model elements) and a class (has behavior)
Realizes one or more interfaces which define its behavior.
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