factory pattern

1. Factory Method Pattern Shahriar Iqbal Chowdhury & Monjurul Habib Code Name: Remington http://www.facebook.com/groups/netter/ 2. Why We need Factory? Caveman Example 3. The Solution 4. A specialist for the job 5. Factory Pattern Method Basics• Creational Pattern• Which object to create• It lets a class defer instantiation to subclasses.• Absolutely all constructors should be private or protected• Also known as Virtual Constructor. 6. When to consider?• When we have a class that implements an interface but not sure which object, which concrete instantiation / implementation need to return.• When we need to separate instantiation from the representation.• When we have lots of select and switch statements for deciding which concrete class to create and return. 7. Factory SaysDefine an interface for creating an object, but let subclasses decide which class to instantiate 8. Problem without Factory Method Pattern 9. Solution Applying Factory Method Pattern 10. Banking Account Management System 11. Object is created based onconfiguration parameters 12. Violation of OCP(Open ClosePrinciple of SOLID) 13. we will need to create a property that indicates type in each account class