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Adapter Pattern
This pattern is easy to understand as the real world is full of adapters. For example consider a USB to Ethernet adapter. We need this when we have an Ethernet interface on one end and USB on the other. Since they are incompatible with each other. we use an adapter that converts one to other. This example is pretty analogous to Object Oriented Adapters. In design, adapters are used when we have a class (Client) expecting some type of object and we have an object (Adaptee) offering the same features but exposing a different interface.

To use an adapter:

The client makes a request to the adapter by calling a method on it using the target interface.
The adapter translates that request on the adaptee using the adaptee interface.
Client receive the results of the call and is unaware of adapter’s presence.
Definition:



The adapter pattern convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces.

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 Code for interface not for implementation.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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