Applied Design Patterns with Java

Design Patterns are observations of successful established O-O practices that have been formalized into a taxonomy. Thus, many developers and designers have informal notions of Design Patterns. Some of these are:

  1. Design Patterns are recurring solutions to design problems you see over and over.
  2. Design Patterns constitute a set of rules describing how to accomplish certain tasks in the realm of software development.
  3. Design Patterns focus more on reuse of recurring architectural design themes, while frameworks focus on detailed design and implementation.
  4. A Design Pattern addresses a recurring design problem that arises in specific design situations and presents solutions to it.
  5. Patterns identify and specify abstractions that are above the level of single classes and instances, or of components.

The taxonomy of 23 common architectural Design Patterns initially were grouped into three recurring paradigms:

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