What is the Spring IoC container?
答：Spring Framework implementation of the Inversion of
Control (IoC) principle. IoC is also known as dependency
injection (DI). It is a process whereby objects define their
dependencies (that is, the other objects they work with) only
through constructor arguments, arguments to a factory
method, or properties that are set on the object instance after it
is constructed or returned from a factory method. The container
then injects those dependencies when it creates the bean.
The Spring framework implementation of the Inversion of Control (IoC) principle. IoC is also called dependency injection (dependency injection, DI). This is a process in which objects define their dependencies only through constructor parameters, factory method parameters, or properties set on the object instance after the object instance is constructed or returned from the factory method. Other objects). Then the container injects these dependencies when creating the bean.