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The Inversion of Control and Dependency Injection patterns are all about removing dependencies from your code.
First ,why there is an Inversion of control in Spring Framework?
Answer would be, In java,user is responsible to instantiate an object of class. But in Spring framework, the control is taken from the user,so user is not responsible to instantiate class object. Rather user will define a component as a spring bean in XML file & after that Spring is responsible to instantiate an object of your class. So the flow is inverted & its called "Inversion of Control"
Dependency injection is a concrete example of Inversion of Control.
Here you do not create your objects but describe how they should be created. You don't directly connect your components and services together in code but describe which services are needed by which components in a configuration file. A container (the IOC container) is then responsible for hooking it all up.
There are several advantages of IOC or dependency injection:
• It minimizes the amount of code in your application.
• It makes your application easy to test as it doesn't require any singletons or JNDI lookup mechanisms in your unit test cases.
• Loose coupling is promoted with minimal effort and least intrusive mechanism.
• IOC containers support eager instantiation and lazy loading of services.
Example
standrad code would look something like:
Now in IOC ,we do something like
- hima.npu March 31, 2015