Hello.

I have the following singleton:

public class Singleton {

   private static final Singleton singleton  = new Singleton();

   private ArrayList<String> list = new ArrayList<String>();

   private Singleton() {
   }

   public static Singleton getInstance() {
      return singleton;
   }

   // ..... and some public methods to access  "list";

}

.... and i have the following class:

public class Usage {

   private final Singleton singletonInstance =
Singleton.getInstance();

}

My question is: it is ok that in Usage class the singletonInstance is
declared final? can i still add/delete from the list declared in the
Singleton? Why?

Thank you in advance