The core container includes: Beans, Core, Context, SpEL
1. core module provides the whole beans and the most basic part of the frame, including the IoC (inversion control) and Dependency Injection (DI).
2. Context based on Core and Beans modules provide the above: he provides a way to access the object framed
3. core, beans, context constitutes a skeleton Spring
4. SpEL: provides a powerful expression language for operating an object at runtime
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