What these two lines of code?

Question

Hi. What these two lines of code? Which Class w() calls? --------------------------- obj temp = new x(); temp.w(); -------------------------- please help me.

Vulpes · Answer

Sure, here's one. I've invented a new method 'm' to illustrate the difference between virtual and non-virtual methods: using System; class obj { public void w() { Console.WriteLine("Hello from obj.w"); } public virtual void m() { Console.WriteLine("Hello from obj.m"); } } class x : obj { public override void m() { Console.WriteLine("Hello from x.m"); } } class Test { static void Main() { obj temp = new x(); temp.w(); temp.m(); // calls x's version Console.ReadKey(); } } The output should be: Hello from obj.w Hello from x.m

Vulpes · Answer

It appears that 'obj' is the parent or an ancestor class of 'x' and that 'obj' contains a method 'w' which is therefore inherited by 'x'. If 'w' is not virtual, then temp.w() will call 'obj's version. If 'w' is virtual or abstract and is overridden within 'x', then temp.w() will call 'x's version because the runtime type of temp is 'x'.

morteza siami · Answer

Ok Vulpes. Fully understood. Thank you.

morteza siami · Answer

Sorry I,not Understand Please give me an example please.

What these two lines of code?

Answers (4)