[Admins]

Graal uses a more dynamic class system instead of a compiler-based class system, those things cannot be mixed easily. Graal demands objects to be dynamic, you can create and modify the objects at any time.

On the other side you have languages like C++ and Java which are basicly providing a class system which restricts the programming to a certain set of class functionality which are only useful at compile-time. When the program is compiled and running then the "class" system is just a chunk of memory and a list of functions attached to each object. These are quite different concepts.

See the idea of "static" variables: it is a restriction, you are basicly using global variables but when compiling the script the compiler ensures that you can only access it from a certain piece of code. The variable is however still accessible from the other code, with some tricks.