IOC Definition

[Malhar]

Hi,

Can anybody tell me the exact definition of Inversion of Control with example.
i.e technical flow ? How exactly it working?

Thanks in advance
Malhar

[Malhar]

Is this ok?

Definition of IOC : Inversion of control is based on the phenomenon that says when ever dependency between two classes (say class A and class B) now if A needs to access the methods of B then following our traditional approach, we go ahead and create an object of B in A.
But as the fact of matter B is there to serve A but not A serving B creating objects for B.
So in IOC the class B will try to inject its object into A rather than A creating object of B. so the control is reversed during the run time now spring container takes care which class object to inject into other class. So here class B inject its dependency in class A using constructor or setter.
So here the statement works "Don't call me, I call you", class B calls class A even if class A needs the object B.

???
Please tell me..

[Bron]

Your wording was a bit confusing to me, but I think you're getting there. Allow me to clarify one of your points.

So in IOC the class B will try to inject its object into A rather than A creating object of B. so the control is reversed during the run time now spring container takes care which class object to inject into other class. So here class B inject its dependency in class A using constructor or setter.

You are exactly correct in that A needs to use B, but A doesn't create B. Just to help you understand how Spring uses IoC, though, B does not inject itself into A. (I suppose it could, but that is not how Spring does it.) Spring acts as a third party -- lets call it class C for example -- which constructs B and injects that copy of B into A. Thus neither A nor B have to know anything about each other. B does not inject itself into A; C injects B into A.

Let me know if this is clear.

[Malhar]

Hi Bron,

Really thanks for guide me to understand, how exact IOC uses by Spring framework.

If I am correct, Spring container inject the copy of object. right?

[Bron]

If I am correct, Spring container inject the copy of object. right?

That is correct.

[Malhar]

So we can say it like:

Definition of IOC : Inversion of control is based on the phenomenon that says when ever dependency between two classes
(say class A and class B) now if A needs to access the methods of B then following our traditional approach, we go ahead and create
an object of B in A.
In Spring IOC, Spring container creates a object of class B and insert the copy of that object into class A by using setter
injection or constructor injection. Thus neither A nor B have to know anything about each other.
Simply stated, in IoC, instead of an application calling the framework, it is the framework that calls the components
specified by the application.

[Atul_More]

hey it really help me to understand the concept