The Dependency Inversion Principle states that the high level modules in an application should not depend on the low level modules; both should rather depend on abstractions.

It also allows the code to satisfy the dependency inversion principle, which specifies that higher-level objects (such as NotificationEngine in the example) should depend on abstractions instead of ...

The current "best practices" for application development is to follow the five principles summarized in the SOLID acronym: Separation of concerns, Open to extension but not modification, the Liskov ...