During the Spring startup process, the important methods are unfolded and made into a mind map to see what you have done. It is helpful for everyone to understand Spring. If you don’t see clearly, download it and look at it, and then search from the source code. The following reference is the source code explanation , Not bad, but the length is longer
Ask Du Niang again if you don't understand
to be continued……
reference:
https://javadoop.com/post/spring-ioc