출처 :http://www.oreillynet.com/onjava/blog/2007/01/singletons_and_lazy_loading.html Singletons and lazy loadingFriday January 26, 2007 7:08AM byDejan BosanacinTechnical Probably the first design pattern that every software developer learns is Singleton and lazy loading of Singleton classes.The usual example, goes something like this:public class Singleton { static Singleton instance; public stati..