Vectors supporting types are the part of next release - and are billed more of performance/coding help then language enhancement. Most of the Java 5 constructs are not really applicable to ActionScript 3 - for fair comparison you need to use Java 7/8 with dynamic scripting language support - and then the way you speak that language changes. Compare how enum support evolved in Java over the years - starting with patterns - and you would think of language as of evolving environment. I was coming to Java in '97 from C++ and I thought of it as a very poor language. 10 years made it almost tolerable - but I still miss ability to redefine operators - does it really matter to anyone who never did it in first place?