super reference nor referring to the super class Examlab Test no 2 question 2

[Prasad Kharkar]

this is a program from ExamLab question 2 of Test no 2
the program ourputs

"DemoC#"

here is the program

   
interface XInterface{
     public abstract void runDemo();
}

abstract class XClass implements XInterface{
     String s="Java";
     public abstract void runDemo();
     {s="C++";}
}

public class YClass extends XClass implements XInterface{
     {s="C#";}
     public void runDemo(){
          System.out.println("Demo"+super.s);
     }
     public static void main(String args[]){
          XInterface xi=new YClass();
          xi.runDemo();
     }
}
 

here in this case even if we are doing super.s, then why is the output DemoC#
Devaka sir has written the explanation but I am unable to understand that

please help

[Abhinav Yadav]

this is so may be because of the object hiding since s is initialized in parent as well as child class so its the s of child class which is being called and not of parent

[Martin Vanyavchich]

As I understand it, YClass inherits the variable s. So there is just one variable and it dosen't matter how do you call it, result will always be "C#". It would be another story if the variable would be static.

[Inder Kumar Rathore]

As there is no variable s in Yclass, so your statement {s="c#";} is equivalent to {super.s="c#"}
this is what compiler does internally.
Remember the tricky statement "Every instance member(field/member func.) must be called by a reference of an object.



best of luck...

[Prasad Kharkar]

Thank you all for your replies
I think I got the point
means
s is the only variable in the program and in the YClass we are assiging the value "C#" to it
but as s is from super class
hence super.s = "C#"

I got it
thanks Martin and Inder Kumar

[Prithvi Sehgal]

What if i say, it is because of instance initializers. No?

It is inherited by the sub-class and when the default constructor will run it will also make the
instance initializers to run as well, thats why the output is DemoC#.

Sorry if its wrong explanation, because i am warming up again for the preparation.

Happy Preparation,