Implementing Singleton with an Enum (in Java)

Question

I have read that it is possible to implement Singleton in Java using an Enum such as:

public enum MySingleton {
     INSTANCE;   
}         


        

Answer 1

Since Singleton Pattern is about having a private constructor and calling some method to control the instantiations (like some getInstance), in Enums we already have an implicit private constructor.

I don't exactly know how the JVM or some container controls the instances of our Enums, but it seems it already use an implicit Singleton Pattern, the difference is we don't call a getInstance, we just call the Enum.