A practical description of the software design patterns as they are mentioned in the 1994 book "Design Patterns - Elements of Reusable ObjectOriented Software" by the author group Gamma, Helm, Johnson and Vlissides (also called "Gang of Four", GoF for short). All patterns are explained in detail by means of examples and also critically appreciated. Furthermore, design principles of object-oriented programming are described and considered. All examples are commented in detail in the source code and are executable under Java 16. In part, newer features of Java up to and including version 16 are also explained and used.
"The book remains a valuable resource, enriching readers with profound insights into design patterns and their significance in software development. In summary, this is an excellent guide for understanding design patterns despite its shortcomings." (Srini Ramaswamy, Computing Reviews, September 26, 2024)