Design pattern come in 4 types: Creational, Structural, Behavioral and J2EE Creational Patterns Factory Abstract Factory Singleton Builder Prototype Structural Patterns Adapter Bridge Filter Composite Decorator Facade Flyweight Proxy Behavorial Patterns Chain of Responsibility Command Interpreter Iterator Mediator Memento Observer State Null Object Strategy Template Vsitor J2EE Patterns Bussiness Delegate Composite Entity DAO Front Controller Intercepting Filter MVC Service Locator Transfer Object Tutorials Point