Spring: Note Finishing (2)--IOC container

IOC container what is IOC

IOC, full name inversion of control, i.e., inversion of controls, is a design idea.
Control :
In Java, IOC means: You put the designed objects into the container control, rather than the traditional direct control over your object content.
In traditional programming, we create objects directly in object content through new. The IOC, however, has a specialized container to create these objects, that is, the IOC to control the creation of objects .
Invert :
Containers help us to find and inject dependent objects, and objects are simply passively accepting dependent objects.
diagram:

When the Ioc/di container is available, we do not have to actively create these objects in the client:

Spring: Note Finishing (2)--IOC container