Changes from C++

• No multiple inheritance
• Automatically handles memory management
• No pointers to arbitrary locations in memory, no pointer arithmetic, no references

• Everything is an object (on the whole, with a few exceptions)
• Multi-threading is a natural part of the language

• No functions, header files, or global variables
• No macros, preprocessing, or conditional compilation
• No variable-length parameter lists, no default parameters
• No templates (templates aren't needed because every object inherits from class Object)
• No unions

C Keywords not available

• asm, auto, enum, extern, register, signed, sizeof, struct, typedef, union, unsigned, wchar_t

C++ Keywords not available

• bool, const_cast, delete, dynamic_cast, friend, inline, mutable, namespace, reinterpret_cast, static_cast, template, typeid, using, virtual