overriding

When I was analyzing a simple java code related with overloading and inheritance I expected to recieve an output that overloads matching the argument's data types. But it doesn't work that way. Code: class A { public int calc (double num){ System.out.println("calc A"); return (int)(num+1);} } class B extends A{ public int calc (long num){ System.out.println("calc B"); return (int)(num+2);} } class C extends B{ public int calc (int num){ System.out.println("calc C"); return num+3;} } class D extends C{ public int calc (float num){ System.out.println("calc D"); return (int)(num+4);} } class

This question already has an answer here: How to quickly determine if a method is overridden in Java 8 answers How to find out if a method is overridden by child classes? For example, public class Test { static public class B { public String m() {return "From B";}; } static public class B1 extends B { } static public class B2 extends B { public String m() {return "from B2";}; } /** * @param args * @throws FileNotFoundException */ public static void main(String[] args) { B b1 = new B1(); System.out.println("b1 = " + b1.m()); B b2 = new B2(); System.out.println("b1 = " + b2.m()); } } Given an

I have something like that (simplified) class A { public: virtual void Function () = 0; }; class B { public: virtual void Function () = 0; }; class Impl : public A , public B { public: ???? }; How can I implement the Function () for A and the Function() for B ? Visual C++ lets you only define the specific function inline (i.e. not in the cpp file), but I suppose it's an extension. GCC complains about this. Is there a standard C++ way to tell the compiler which function I want to override? (visual c++ 2008) class Impl : public A , public B { public: void A::Function () { cout << "A::Function" <

Because of my device I can't use virtual functions. Suppose I have: class Base { void doSomething() { } }; class Derived : public Base { void doSomething() { } }; // in any place { Base *obj = new Derived; obj->doSomething(); } the obj->doSomething() will call just the Base::doSomething() Is there a way with Base *obj , to call the doSomething of the Derived ? I know I can just put a virtual before doSomething() of Base it solve the problem, but I'm limited by my device, the compiler doesn't support it. paxos1977 You could down cast the base class pointer to the derived class and call the

Is there any way to enforce the usage of the C++11 override keyword in Visual C++ 2012? (i.e. if I forget to say override , then I want to get a warning/error.) C++11 almost had what you want. Originally the override keyword was part of a larger proposal ( N2928 ) which also included the ability to enforce its usage: class A { virtual void f(); }; class B [[base_check]] : public A { void f(); // error! }; class C [[base_check]] : public A { void f [[override]] (); // OK }; The base_check attribute would make it an error to override a virtual function without using the override keyword. There