Monday, July 22, 2002 03:23 AM
J2SE is the "Java 2 Standard Edition", whereas J2EE is the "Java 2 Enterprise Edition". J2EE is a proper superset of J2SE, with additional components dealing with mostly server-centric technologies (EJBs, Servlets, JSPs. etc).
As for the versioning, Sun have explained there nomenclature in this article - http://java.sun.com/products/jdk/1.2/java2.html - it should give you a general idea of what is Java Platform, Java SDK and Java Runtime.
Hope that helps.