A design pattern is a proven design solution to a common problem faced by software developers. Design patterns became popular with the rise of Object Oriented Analysis and Design(OOAD). Design patterns are designed to help developers deliver higher quality, more easily maintained software products in less time and at lower cost.
Design patterns are:
- encapsulated - They embody design knowledge regarding collaboration of classes and objects, distribution of responsibility, and other design issues.
- object-oriented - They incorporate OOAD principles—e.g., low coupling, high cohesion.
- reusable - They are adaptable, flexible, general solutions to classes of problems with broad applicability. Design patterns simplify the task facing the developer.
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