Creational Design Patterns

Patterns that are concerned with object instantiation 

• Factory patterns 
  • Simple factory 
  • Factory method pattern 
  • Abstract factory pattern 
• Singleton pattern 
• Builder pattern 
• Prototype pattern 
• Object pool pattern

Factory Patterns

Three different types of factory patterns 

• Simple factory 
  • Not really a design pattern 
  • Rather, it is a simple encapsulation of object creation into another class 
• Factory method pattern (Factory pattern) 
  • Defines an abstract method called “factory method” in abstract class 
  • This abstract factory method is implemented by concrete factory subclasses – the subclasses are responsible for object creation 
• Abstract factory pattern 
  • Provides a way to encapsulate a group of individual factories that have a common theme without specifying their concrete classes

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