Best single template with Java 5

Question

Since Java 5 says the best way to create a singleton is with a singleton enum type.

Example:

public enum SuperSingleton implements Zooma{ INSTANCE; /** */ public void fightTheBattle(){ System.out.println("I am fighting the battle!!!"); } @Override public void runningWild() { //This is method implemented from the Zooma interface. } } 

According to Joshua Bloch, a singleton singleton singleton:

• more concise
• provides serialization machines for free
• and provides distinct from multiple instances.

I can see how much shorter it is and how it provides a monstrous character against a multiple instance , but how does it provide free serialization?

Is this something singleton gets by listing?

Answer 1

Yes, the enumerations are all extended from the Enum class , which implements Serializable .

Answer 2

http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Enum.html

Yes:)

Answer 3

I'm not 100% sure, but I think that if you deserialize a serialized singleton more than ever, you can get more than one instance. An enum instance will always remain a single.

So, you get "more serialization" than what you get from implementing serialization.