The JVM still doesn't know about generics. The explanation you provided is entirely at the compiler (javac) level, and the JVM is still oblivious to it. There is no special dispatch, or optimization. At best, you could say there is support in the Java standard library, but not in the JVM or hotspot or anything from running "java".

An easy way to verify: Are generics in Clojure, Scala, or JRuby the same as Java (the programming language)?