Is it, though? The most basic implementation, where things are still erased at runtime by the JIT, should be fairly simple, although it will not give the expected perf gains, of course.
Either way, CLR and C# did it a long time ago, and in the same time period when Java acquired its type-erased generics.
Either way, CLR and C# did it a long time ago, and in the same time period when Java acquired its type-erased generics.