Question

Basically I have a class which an instance of is created via a Singleton class. The class should never been instantiated via any other means than the singleton class. My question is can the class be effectively ‘not seen’ by other classes, apart from Singleton.

I know inner classes and different pacakages etc would help, but I’m curious to see if anyone has a nice solution to this.

Thanks for replies

Answer 1

An easy and efficient way to do Singleton with an Enum:

public enum Singleton {
        INSTANCE;
        public void execute (String arg) {
            //... perform operation here ...
        }
}