How does autowiring work in Spring?

Question

I\'m a little confused as to how the inversion of control (IoC) works in Spring.

Say I have a service class called UserServic

Answer 1

In simple words Autowiring, wiring links automatically, now comes the question who does this and which kind of wiring. Answer is: Container does this and Secondary type of wiring is supported, primitives need to be done manually.

Question: How container know what type of wiring ?

Answer: We define it as byType,byName,constructor.

Question: Is there are way we do not define type of autowiring ?

Answer: Yes, it's there by doing one annotation, @Autowired.

Question: But how system know, I need to pick this type of secondary data ?

Answer: You will provide that data in you spring.xml file or by using sterotype annotations to your class so that container can themselves create the objects for you.