Java Design Patterns 2022
summary
Modernizes GoF patterns for Java 2022 by showing concrete rewrites and working code: uses Supplier<LocalDate> injection so tests can fake "today", provides a static factory of() instead of public constructors, replaces Strategy with lambdas and Stream.reduce, demonstrates Builder alternatives with records and currying, implements a tested tennis game using records, sealed interfaces and the new switch, advocates enum singletons, replaces classic Chain of Responsibility with reviewers returning Optionals and using Optional.stream + flatMap, and shows a decorator via wrap class; all examples compile and tests run green, repo linked on GitHub.
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chapters (24)
- 0:00Start
- 2:38Goals
- 3:16Tdd Immutability
- 3:44Avoiding Side Effects
- 6:30Decorator Pattern
- 11:25Test a Static Method Factory
- 17:49Strategy Pattern
- 20:57Strategy Pattern Problem
- 22:59Builder Pattern
- 25:10Replace Constructor with Builder
- 28:25Reference Pipeline
- 32:57Singleton
- 33:37Singletons
- 34:43Disadvantages
- 35:45Create a Singleton as an Enum
- 36:24State Pattern
- 37:18Off State
- 49:56Result Game
- 51:17Chain of Responsibility
- 52:03Carfax
- 57:57The Adapter Pattern
- 59:02Adapter Pattern
- 1:00:33Wrap Class and Wrap Methods
- 1:01:05Refactoring Strategies
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