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Design Patterns in Java

Google Java Style MIT Build Status

Classic OOP Design Patterns from GoF, implemented in Java.


Design Patterns Implemented

Structural

  • UML – Class Adapter β€” allows classes with incompatible interfaces to work together by wrapping its own interface around that of an already existing class
  • UML – Object Adapter
  • UML – Facade β€” provides a simplified interface to a large body of code
  • UML – Composite β€” composes zero-or-more similar objects so that they can be manipulated as one object
  • UML – Decorator β€” dynamically adds/overrides behaviour in an existing method of an object
  • UML – Proxy β€” provides a placeholder for another object to control access, reduce cost, and reduce complexity
  • UML – Flyweight β€” reduces the cost of creating and manipulating a large number of similar objects
  • UML – Bridge β€” decouples an abstraction from its implementation so that the two can vary independently

Creational

  • UML – Factory Method β€” creates objects without specifying the exact class to create
  • UML – Abstract Factory β€” groups object factories that have a common theme
  • UML – Prototype β€” creates objects by cloning an existing object
  • UML – Singleton β€” restricts object creation for a class to only one instance
  • UML – Builder β€” constructs complex objects by separating construction and representation

Behavioral

  • UML – Template Method β€” defines the skeleton of an algorithm as an abstract class, allowing its subclasses to provide concrete behavior
  • UML – Strategy β€” allows one of a family of algorithms to be selected on-the-fly at runtime
  • UML – State β€” allows an object to alter its behavior when its internal state changes
  • UML – Command β€” creates objects which encapsulate actions and parameters
  • UML – Observer β€” is a publish/subscribe pattern which allows a number of observer objects to see an event
  • UML – Mediator β€” allows loose coupling between classes by being the only class that has detailed knowledge of their methods
  • UML – Memento β€” provides the ability to restore an object to its previous state (undo)
  • UML – Iterator β€” accesses the elements of an object sequentially without exposing its underlying representation
  • UML – Visitor β€” separates an algorithm from an object structure by moving the hierarchy of methods into one object
  • UML – Chain of Responsability β€” delegates commands to a chain of processing objects

Build

./gradlew clean build

Test

./gradlew test

License

Licensed under MIT.

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πŸ“— Classic OOP Design Patterns from GoF, implemented in Java.

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