99 lines
3.7 KiB
Markdown
99 lines
3.7 KiB
Markdown
# GoF Design Patterns in Java
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Complete runnable Java 17 implementations of all 23 Gang of Four design patterns. Each pattern has a dedicated article at [ankurm.com](https://ankurm.com/gof-design-patterns-java/) with a UML diagram, step-by-step explanation, and console output.
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## Structure
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```
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design-patterns/
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├── 01-creational/
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│ ├── factory-method/
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│ ├── abstract-factory/
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│ ├── builder/
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│ ├── prototype/
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│ └── singleton/
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├── 02-structural/
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│ ├── adapter/
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│ ├── bridge/
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│ ├── composite/
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│ ├── decorator/
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│ ├── facade/
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│ ├── flyweight/
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│ └── proxy/
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└── 03-behavioral/
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├── chain-of-responsibility/
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├── command/
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├── interpreter/
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├── iterator/
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├── mediator/
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├── memento/
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├── observer/
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├── state/
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├── strategy/
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├── template-method/
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└── visitor/
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```
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## Prerequisites
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- Java 17+ (Eclipse Temurin recommended)
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- No build tool required — plain `javac` / `java`
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## Run any pattern
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```powershell
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# Windows (PowerShell)
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$JAVAC = 'C:\Program Files\Eclipse Adoptium\jdk-17.0.7.7-hotspot\bin\javac.exe'
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$JAVA = 'C:\Program Files\Eclipse Adoptium\jdk-17.0.7.7-hotspot\bin\java.exe'
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& $JAVAC 03-behavioral/strategy/*.java -d out/strategy
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& $JAVA -cp out/strategy strategy.Main
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```
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```bash
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# Linux / macOS
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javac 03-behavioral/strategy/*.java -d out/strategy
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java -cp out/strategy strategy.Main
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```
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## Run all behavioral patterns (Windows)
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Double-click `RUN-behavioral.bat` or run in PowerShell:
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```powershell
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powershell -ExecutionPolicy Bypass -File run-behavioral.ps1
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```
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## Articles
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| Pattern | Category | Article |
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|---------|----------|---------|
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| Factory Method | Creational | https://ankurm.com/factory-method-design-pattern-java/ |
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| Abstract Factory | Creational | https://ankurm.com/abstract-factory-design-pattern-java/ |
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| Builder | Creational | https://ankurm.com/builder-design-pattern-java/ |
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| Prototype | Creational | https://ankurm.com/prototype-design-pattern-java/ |
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| Singleton | Creational | https://ankurm.com/singleton-design-pattern-java/ |
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| Adapter | Structural | https://ankurm.com/adapter-design-pattern-java/ |
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| Bridge | Structural | https://ankurm.com/bridge-design-pattern-java/ |
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| Composite | Structural | https://ankurm.com/composite-design-pattern-java/ |
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| Decorator | Structural | https://ankurm.com/decorator-design-pattern-java/ |
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| Facade | Structural | https://ankurm.com/facade-design-pattern-java/ |
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| Flyweight | Structural | https://ankurm.com/flyweight-design-pattern-java/ |
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| Proxy | Structural | https://ankurm.com/proxy-design-pattern-java/ |
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| Chain of Responsibility | Behavioral | https://ankurm.com/chain-of-responsibility-design-pattern-java/ |
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| Command | Behavioral | https://ankurm.com/command-design-pattern-java/ |
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| Interpreter | Behavioral | https://ankurm.com/interpreter-design-pattern-java/ |
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| Iterator | Behavioral | https://ankurm.com/iterator-design-pattern-java/ |
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| Mediator | Behavioral | https://ankurm.com/mediator-design-pattern-java/ |
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| Memento | Behavioral | https://ankurm.com/memento-design-pattern-java/ |
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| Observer | Behavioral | https://ankurm.com/observer-design-pattern-java/ |
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| State | Behavioral | https://ankurm.com/state-design-pattern-java/ |
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| Strategy | Behavioral | https://ankurm.com/strategy-design-pattern-java/ |
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| Template Method | Behavioral | https://ankurm.com/template-method-design-pattern-java/ |
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| Visitor | Behavioral | https://ankurm.com/visitor-design-pattern-java/ |
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## Reference
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- *Design Patterns: Elements of Reusable Object-Oriented Software* — Gamma, Helm, Johnson, Vlissides
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- https://refactoring.guru/design-patterns
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