Design Patterns in Java Theory

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GoF Design Pattern

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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 Code for interface not for implementation.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

In total there are 23 basic design patterns and more.

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