J2EE Design Patterns

Creational Design Pattern

Creational: Singleton

when to use :

Used in Logging, Cache, Session, Drivers 

Creational: Factory 

When to use :

Implementation :

Factory chooses the objects, DAO, Abstract DAO factory 

Creational:builder  

Defines essiential parameter in constructor & optional in setters & add build method .Call build method at the end.

Creational: Prototype

  

Creational:AbstractFactory 

Structural 

improves  the structure of code

Structural: prototype 

Clone method 

Structural: proxy 

Structural: Facade 

Structural: Composite Design Pattern

 

Structural: Flyweight Design Pattern

Structural: Adapter

 

Structural: Bridge 

Behavioural

Behavioural:template 

Subclass defines behvaiour , order of exectution can be defined in superclass  

Behavioural:Observer 

Subclass defines behvaiour , order of exectution can be defined in superclass 

Concurrency Patterns

Thread pool Pattern is special case of Object pool design pattern 

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