Singleton using Static Members and Methods? [duplicate]

Question

We can replicate a Singleton behavior my making a Class with Static Methods and Member Elements. Other than serialization What's the harm of implementing a singleton using static Body only.

Answer 1

You can't use this pattern to implement a provider for some interface or to allow for subclassing or other alternate behavior. This means that testing becomes more difficult and you can't use dependency injection for anything your static class does.