The Singleton pattern is deceptively simple, even and especially for Java developers. In this classic JavaWorld article, David Geary demonstrates how Java developers implement singletons, with code ...

public class Singleton { private String var1; private Long var2; //...private constructor and all the good // stuff to ensure that only one instance of this class is created even across threads goes ...

So what is really the Singleton? Well, it is a Design Pattern that allows us to restrict the class that implements it to have just one instance of itself at all times. In plain terms this means that ...