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The authors begin by describing what patterns are and how they can help you design object-oriented software. They then go on to systematically name, explain, evaluate, and catalog recurring designs in object-oriented systems. With Design Patterns as your guide, you will learn how these important patterns fit into the software development process, and how you can leverage them to solve your own design problems most efficiently. Features - Each pattern describes the circumstances in which it is applicable, when it can be applied in view of other design constraints, and the consequences and trade-offs of using the pattern within a larger design.- All patterns are compiled from real systems and are based on real-world examples- Each pattern also includes code that demonstrates how it may be implemented in object-oriented programming languages like C++ or Smalltalk. About the Author Erich Gamma, Software Technology Center of Object Technology International Richard Helm, IBM, Sydney Ralph Johnson, University of Illinois, Urbana-Champaign John Vlissides, IBM Thomas J. Watson Research Center