spring - Ioc Container: Dependency Injection, Dependency Lookup? -

i trying understand spring framework more know currently, , referring "pro spring 3" book.

i came across following section in book below:

it says in general ioc can decomposed 2 components viz: dependency injection , dependency lookup.

with respect this, have following questions:

1) spring provide both dependency injection ,dependency lookup ?

2) ioc container have both these systems viz: dependency injection ,dependency lookup?

3) if spring provides both dependency injection ,dependency lookup, isn't wrong spring di framework, when has both these capabilities?

1: yes, spring provides both dependency injection , dependency lookup. can let spring inject dependencies using example @autowired annotation, , can manually lookup components spring's applicationcontext calling 1 of getbean methods.

the main thing understand concept "inversion of control" (ioc) spring work you, instead of other way around: let spring create instances of components, , let spring inject dependencies, instead of other way around, write code create instances , lookup dependencies.

2: no, not necessarily.

3: spring can dependency injection (di), di framework. because other things (such allow lookup components explicitly) doesn't not make di framework anymore.