Revisiting Design Patterns after 20
summary
Live refactorings convert legacy GoF patterns into concise Java 20 constructs: Singleton becomes an enum singleton, Command maps to Runnable, Strategy and Template Method use Function/Predicate/Consumer and method references, Chain of Responsibility becomes a stream findFirst filter, Interpreter uses enums+Optional and returns 7 in the demo, Visitor is replaced by pattern matching switch on sealed types, and Specification reduces to composed Predicates. Code runs on stage and is published on GitHub for reproduction.
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chapters (13)
- 0:00Introduction and context
- 3:35Guiding principles for modern patterns
- 5:40Patterns covered in the talk
- 6:02Command pattern revisited
- 6:45Observer pattern revisited
- 8:10Singleton pattern revisited
- 9:13Strategy pattern revisited
- 12:47Template method revisited
- 16:19Interpreter pattern revisited
- 21:59Chain of responsibility revisited
- 28:39Visitor pattern revisited
- 38:59Specification pattern revisited
- 42:56Resources and closing
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