Design Patterns

1. About Design Patterns
2. Creational Patterns
   1. Factory Method --Creates an instance of several derived classes
   2. Abstract Factory --Creates an instance of several families of classes
   3. Builder --Separates object construction from its representation
   4. Prototype --A fully initialized instance to be copied or cloned
   5. Singleton --A class of which only a single instance can exist
3. Structural Patterns
   1. Adapter --Match interfaces of different classes
   2. Bridge --Separates an object’s interface from its implementation
   3. Composite --A tree structure of simple and composite objects
   4. Decorator --Add responsibilities to objects dynamically
   5. Facade --A single class that represents an entire subsystem
   6. Flyweight --A fine-grained instance used for efficient sharing
   7. Proxy --An object representing another object
4. Behavioral Patterns
   1. Chain of Responsibility --A way of passing a request between a chain of objects
   2. Command --Encapsulate a command request as an object
   3. Interpreter --A way to include language elements in a program
   4. Iterator --Sequentially access the elements of a collection
   5. Mediator --Defines simplified communication between classes
   6. Memento --Capture and restore an object's internal state
   7. Observer --Alter an object's behavior when its state changes
   8. State --Alter an object's behavior when its state changes
   9. Strategy --Encapsulates an algorithm inside a class
   10. Template Method --Defer the exact steps of an algorithm to a subclass
   11. Visitor --Defines a new operation to a class without change
5. J2EE Patterns
   1. MVC --Decouple the relationships among data, representation and controller
   2. Business Delegate --An intermediate class between presentation-tier clients and business services.
   3. Composite Entity --manage interactions between fine-grained or coarse-grained internally
   4. Data Access Object --Adapt a uniform interface to access multiple databases
   5. Front Controller --Using a single component to process application requests
   6. Intercepting Filter --A pluggable component to intercept incomming requests/responses
   7. Service Locator --Centralizing distributed service object lookups
   8. Transfer Object --A serializable class to act as data carrier, grouping related attributes
6. Miscellaneous
   1. typesafe enum
   2. RESTful WS