Abstract Factory , Factory Patterns In Java | Design Patterns in Java | Java Tutorial In Hindi

Abstract Factory Pattern says that just define an interface or abstract class for creating families of related (or dependent) objects but without specifying their concrete sub-classes.That means Abstract Factory lets a class returns a factory of classes. So, this is the reason that Abstract Factory Pattern is one level higher than the Factory Pattern.

An Abstract Factory Pattern is also known as Kit.

Advantage of Abstract Factory Pattern
Abstract Factory Pattern isolates the client code from concrete (implementation) classes.
It eases the exchanging of object families.
It promotes consistency among objects.
Usage of Abstract Factory Pattern
When the system needs to be independent of how its object are created, composed, and represented.
When the family of related objects has to be used together, then this constraint needs to be enforced.
When you want to provide a library of objects that does not show implementations and only reveals interfaces.
When the system needs to be configured with one of a multiple family of objects.

Best practices are called as Design Patterns.
Principles of Design Patterns:
1. Composition over inheretance is always preferred.
2. Code for interface not for implementation.


Types of Design Patterns:
1. Creational
2. Structural
3. Behavioural

A. Creational Design Pattern:
1. Singleton
2. Factory
3. Abstract factory
4. Builder
5. Prototype

B. Structural Design Patterns
6. Adapter
7. Composite
8. Proxy
9. Fly weight
10. Facade
11. Bridge
12. Decorator

C. Behavioural
13. Template Method
14. Mediator
15. Chain of Responsibility
16. Observer
17. Strategy
18. Command
19. State
20. Visiter
21. Iterator
22. Interpretor
23. Memento


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