Java SE, Servlets & JSP, GoF Design Patterns, JUnit, Log4j, Ant, UML, SQL, JPA, Hibernate
###Gang of Four Design Patterns Principles:
- Program to an interface not an implementation
- Favor object composition over inheritance
####Creational Patterns:
- Factory Method
- Abstract Factory
- Builder
- Singleton
- Prototype
####Behavioral Patterns:
- Chain of Responsibility
- Command
- Iterator
- Mediator
- Memento
- Observer
- State
####Structural Patterns:
- Adapter
- Bridge
- Composite
- Decorator
- Facade
- Flyweight
- Proxy