The benefits of the spring framework of the Java framework, why learn the spring framework

Why learn the framework of spring
A: Easy to decouple and simplify development
Spring is a large factory that can maintain all object creation and dependency relationships and give spring management
Support for B:AOP programming
Spring provides aspect-oriented programming, which can easily implement the functions of permission interception, operation monitoring, etc.
C: Support for declarative transactions
The management of transactions can be done only through configuration, without the need for manual programming
D: Convenient program testing
Spring support for JUNIT4, which can be easily tested with annotations for spring programs
E: Easy integration of a variety of excellent frameworks
Spring does not exclude a variety of excellent open source frameworks that provide direct support for a variety of excellent frameworks (e.g. Struts2, Hibernate, MyBatis, quartz, etc.)
F: Reduce the difficulty of using Java EE API
Spring provides encapsulation for some of the most difficult APIs (JDBC, JavaMail, remote calls, and so on) in Java EE Development, making these API applications much less difficult to apply

The benefits of the spring framework of the Java framework, why learn the spring framework