is this Singleton resistant to both Serialization and Reflection Attacks?

Question

Is the following code resistant to both Serialization and Reflection Attacks?

public class Example{
  private static Example instance=new Example();

  private E         


        

Answer 1

No, it is not. There is a better technique.

Try something like this:

public enum Elvis {
    INSTANCE;
    public static boolean isThereOnlyOneElvis() {
        return true;
    }
}

// In your code:
if ( !Elvis.INSTANCE.isThereOnlyOneElvis() ) {
    System.err.println("Liar !!!");
}