Difference between IOC and Dependency Injection in Spring.

Question

Difference between IOC and Dependency Injection in Spring.

SpringObject Oriented ProgrammingProgramming

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Inversion of control is a design principle which helps to invert the control of object creation.

According to the paper written by Martin Fowler , inversion of control is the principle where the control flow of a program is inverted: instead of the programmer controlling the flow of a program, the external sources (framework, services, other components) take control of it. It's like we plug something into something else. He mentioned an example about EJB 2.0.

Dependency Injection is a design pattern which implements IOC principle. DI provides objects that an object needs. Let’s say, class X is dependent on Y. So rather than creating object of Y within the class “X”, we can inject the dependencies via a constructor or setter injection.

Sr. No.	Key	IOC	Dependency Injection
1	Design Principle	It is design principle where the control flow of the program is inverted	It is one of the subtypes of the IOC principle
2	Implementation	It is a term which is implemented by multiple design patterns  service locator , events , delegates and dependency Injection	DI is design pattern which can be achieved by constructor and setter injection
3	Use Case	Aspect oriented programing is one way to implement IOC	In Case of change in business requirement no code change required

Himanshu shriv

Published on 09-Sep-2020 12:20:18

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