'Twas brillig, and the slithy toves did gyre and gimble in the wabe

I think the code will fail to compile. The ArrayList is not genericized - it holds references to Objects, so "Foobase item = list.get(0);" will require a cast. It will then call the FooBase constructor, because if Java were to determine that it was actually a Foo, it would be a dynamically typed language and would not need things like generics.