Answer
A design pattern is a
solution to a general
software problem within a
particular context.
- Context
- A recurring set of situations where
the pattern applies.
- Problem
- A system of forces (goals and constraints)
that occur repeatedly in this context.
- Solution
- A description of communicating objects
and classes (collaboration) that can be
applied to resolve those forces.
Design patterns capture solutions that have
evolved over time as developers strive for
greater flexibility in their software.
Whereas class libraries are reusable source code,
and components are reusable packaged objects,
patterns are generic, reusable design
descriptions that are customized to solve a
specific problem. The study of design patterns
provides a common vocabulary for communication
and documentation, and it provides a framework
for evolution and improvement of existing
patterns.
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