A design pattern is a reusable solution to common problems in a software design.

This is a Free EBook on Design Patterns. In software engineering, a design pattern is a general reusable solution to a commonly occurring problem within a given context in software design. It is a description or template for how to solve a problem that can be used in many different situations. Patterns are formalized best practices that the programmer must implement in the application. Object-oriented design patterns typically show relationships and interactions between classes or objects, without specifying the final application classes or objects that are involved.

This book covers many different design patterns like abstract factory, builder, factory method etc. (creational patterns), adapter, bridge, composite, proxy etc. (structural patterns), command, iterator, state, strategy etc. (behavioral patterns) and reactor, scheduler etc. (concurrency patterns).

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