I'm about to jump into Java development again after a number of years. The language revision I worked with was 1.4.2. I know there have been significant changes to the language since then, and I'm looking for a site or a book that covers these in some detail. At the very least, I'm looking for a resource that indicates which language features were added in which revision, so I can at a glance skip the sections I'm already familiar with. Any suggestions ?
You could check out the Sun website. You can find the changes in Java 5 and Java 6. I think most of the significant language changes came in Java 5 with Generics, Autoboxing, Varargs, Enums etc.