How to abstract dependency in OOPS

Below rules should be followed in OOPS to implement Dependency Inversion Principle.

·         All member variables in a class must be interfaces or abstracts.

·         All concrete class packages must connect only through interface/abstract class’s packages.

·         No class should derive from a concrete class.

·         No method should override an implemented method.

·         All variable instantiation requires the implementation of a Creational pattern as the Factory Method or the Factory pattern, or the more complex use of an Injection framework.