Design Patterns with Java: An Introduction (2023) True PDF, ePUB 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. Patterns describe language-independent abstract solution approaches. This means that each generation of developers is challenged to develop their own implementations. Gamma et al. wrote their exemplary implementations in Smalltalk, among other languages. Implementations in Java may look quite different.