Revisiting Design Patterns After 20
summary
Classic GoF patterns get concrete modernization: prefer composition, small interfaces and reuse JDK functional types instead of inventing interfaces; examples show use Runnable not Command, replace template methods with Function strategies, and enum singletons avoid serialization issues. Demos use Java 8+ features—Function, Consumer, Optional, method references, streams, enums, sealed classes and pattern matching—to simplify Strategy, Chain of Responsibility, Interpreter and Visitor alternatives. A working reverse‑Polish interpreter and streaming notifier chain run in the demo code, which is on GitHub at yanaga/revisiting-design-patterns.
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chapters (9)
- 0:00Introduction and principles
- 6:25Command and observer
- 8:47Strategy pattern
- 14:50Template methods
- 19:34Singleton pattern
- 21:03Interpreter pattern
- 33:31Chain of responsibility
- 41:09Visitor pattern
- 52:18Specification and conclusion
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