Design Patterns

• A proven solution to a particular problem which is frequently occurred in application's life cycle
• There are various solutions, here we've to take strategic decision to choose the right pattern for a partular type of problem.

Creational Design Patterns

• It is all about class instantiation
• How effectively create an object and reuse it again n again
• Types: Singleton, Factory, Abstract Factory, Prototype, Builder, Object Pool, etc.

Structural Design Patterns

• The patterns all about class and object composition. ie. combining objects and class to form large composite object.
• Assign relationship between classes ie. using Inheritance.
• Types: Adapter, Bridge, Composite, Decorator, Facade, Proxy, etc.

Behavioral Design Patterns

• It is all about the identifying common communication between object.
• ie. interaction between objects (loosely coupled)
• Types: Iterator, Interpreter, Mediator, Observer (pub-sub), Visitor, Strategy, Template methods, Mediator, etc.