Cool singleton solution

Singletons are considered a bad design pattern, but sometimes they can be very handy.

Usually I implement them like this:

public final class Singleton {

    private static final Singleton instance;

    static {
        instance = new Singleton();
    }

    public static Singleton getInstance() {
        return instance;
    }

    public void doSingleStuf() {

    }
}

But flipping through ‘Effective Java’ the other day I saw some other approach, using a enum type.

public enum Singleton {
    INSTANCE;

    public void doSingleStuf() {

    }
}

Haven’t seen that approach before, but I like it!