G++ compiler cannot distinguish variable and function with the same name?

Possible Duplicate:
Class method and variable with same name, compile error in C++ not in Java?

The G++ compiler would complain when my class member name and member function name are the same. It seems that whenever a variable name happens to be the same as a function name, the compiler would complain.

In Java, it is not the case. I just wonder why the G++ compiler cannot distinguish a variable name from a function name since the function name always comes with a pair of parenthesis.

struct Callable
{
    void operator()() const { }
};

struct Test
{
    void Call() { }
    Callable Call;
};

int main()
{
    Test x;
    x.Call(); // To which 'Call' does this refer?
}