Как сделать Singleton в Java

public enum Singleton {
    INSTANCE;
    
    public void doSomething() {
        // реализация метода
    }
}

public class Singleton {
    private static volatile Singleton instance;
    
    private Singleton() {}
    
    public static Singleton getInstance() {
        if (instance == null) {
            synchronized (Singleton.class) {
                if (instance == null) {
                    instance = new Singleton();
                }
            }
        }
        return instance;
    }
}