Reconstruction I understand (c #)

Reconstruction I understand (c #)

Today, I saw an article about application interfaces, mainly about how to use the built-in. net functions to reconstruct the code. I think it is a bit interesting. I will extract the code for future reference. But I have the same question as the author of this article. Is it true to refactor the code? How is loose coupling implemented? I don't know if you have any experts. Can you give me some advice? Thank you!

The first is the old Code, as follows:

public class ClassRegistration     {        public void Create()         {            // create registration code         }        public void Transfer()         {            // class transfer code         }        public decimal Total { get; private set; }     }    public class RegistrationProcessor     {        public decimal ProcessRegistration(ClassRegistration registration)         {             registration.Create();            return registration.Total;         }     }

The code after reconstruction is as follows:

public interface IClassRegistration     {        void Create();        decimal Total { get; }     }    public class ClassRegistration : IClassRegistration     {        public void Create()         {            // create registration code         }        public void Transfer()         {            // class transfer code         }        public decimal Total { get; private set; }     }    public class RegistrationProcessor     {        public decimal ProcessRegistration(IClassRegistration registration)         {             registration.Create();            return registration.Total;         }     }