Spring - DI & IOC

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DI & IOC:
* Dependency injection is the concept where one object is loosely coupling with another object is called DI.
* In Spring with the help of IOC container we are achieving this. It is responsible to do for us to give DI in our application.
* Dependency Invertion is the concept, that is where we are creating Interface or abstract class, then we will give the implementation,
then using spring will autowired the bean.


Advantages :
1. Loosely coupling.
2. Testing

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