I tried calling an overridden method from a constructor of a parent class and noticed different behavior across languages.

C++ - echoes A.foo()

class A{

public: 

    A(){foo();}

    virtual void foo(){cout<<"A.foo()";}
};

class B : public A{

public:

    B(){}

    void foo(){cout<<"B.foo()";}
};

int main(){

    B *b = new B(); 
}

Java - echoes B.foo()

class A{

    public A(){foo();}

    public void foo(){System.out.println("A.foo()");}
}

class B extends A{  

    public void foo(){System.out.println("B.foo()");}
}

class Demo{

    public static void main(String args[]){
        B b = new B();
    }
}

C# - echoes B.foo()

class A{

    public A(){foo();}

    public virtual void foo(){Console.WriteLine("A.foo()");}
}

class B : A{    

    public override void foo(){Console.WriteLine("B.foo()");}
}


class MainClass
{
    public static void Main (string[] args)
    {
        B b = new B();              
    }
}

I realize that in C++ objects are created from top-most parent going down the hierarchy, so when the constructor calls the overridden method, B does not even exist, so it calls the A' version of the method. However, I am not sure why I am getting different behavior in Java and C#.