Asking super of super

Question

I have a doubt about if what I want to do is possible. I have three classes A, B y C. B extends A and C extends B.

C -> B -> A.

In C class, I want to call a method directly of A class. Something like

super.super.method();

do I have any chance of do it?

The Reason:

A and B are system classes. I am trying to make B handle some situations in a different way and I have accomplished it except for one method. In other methods what I did is to override them and pass the arguments modified.

Now I have a method that I cannot solve just modifying the arguments so I want to fully override it.

B

@Override
public void draw(Canvas canvas) {
    super.draw(canvas); // A method
    ** other stuff **
}

What I want to do in C

@Override
public void draw(Canvas canvas) {
    super.super.draw(canvas); // A method
    ** new stuff **
}

http://stackoverflow.com/questions/11935895/java-how-to-call-super-super-in-overriden-method-grandparent-method Perhaps "google" your query before posting here? — Ben Dale, Aug 29 '13 at 08:54
I didn't find them before posting :(. Thanks for the links. Should I delete the answer? I'm kind of newbie. — Juangcg, Aug 29 '13 at 09:06

score 4 · Accepted Answer · edited May 23 '17 at 12:31

4

Picked up the most appropriate answer from here by Jon Skeet

You can't - because it would break encapsulation.

You're able to call your superclass's method because it's assumed that you know what breaks encapsulation in your own class, and avoid that... but you don't know what rules your superclass is enforcing - so you can't just bypass an implementation there.

edited May 23 '17 at 12:31

Community

1
1

answered Aug 29 '13 at 08:55

Aniket Thakur

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score 2 · Answer 2 · answered Aug 29 '13 at 08:53

2

You cannot. super only gives you access to the direct superclass.

If you think need to do that you probably have a design issue. Can you please give us more details about what you would like to do?

answered Aug 29 '13 at 08:53

mariosangiorgio

5,520
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score 0 · Answer 3 · answered Aug 29 '13 at 08:56

0

I don't think that is possible. May be you can implement this way.

class B

method(){
super.method()
}

Then in class C you can call super.method(). That way you'll eventually call A's method.

answered Aug 29 '13 at 08:56

Crickcoder

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Isn't this equivalent to not writing the method at all in the subclass? – mariosangiorgio Aug 29 '13 at 09:21
If he is not writing the method in subclass then there is no need of this thread – Crickcoder Aug 29 '13 at 09:25
What's the difference between writing the method as you propose and not writing it at all leaving that the JVM figures out by itself that the method is implemented in the superclass? – mariosangiorgio Aug 29 '13 at 09:50

score 0 · Answer 4 · answered Aug 29 '13 at 09:21

class A
{
  void access()
  {
   //this method is to be accessed
    System.out.println("I can be accessed");
  }
}
class B extends A
{
  //code here
}

class C extends B
{

  public static void main(String[] args)
  {
    C ob = new C();
    ob.call();
  }

 void call()
  {
  super.access();
  }
}

score -2 · Answer 5 · answered Aug 29 '13 at 08:55

-2

super can be used to call your direct parent class .

May be you can design a class B function such that the super would call class A . Now you can use class C to achieve the desired result .

answered Aug 29 '13 at 08:55

Shuhail Kadavath

448
3
13

This should be a comment and not an answer. – Aniket Thakur Aug 29 '13 at 08:56
I gave an answer . I just wanted to confirm his situation . So asked in the same section . Removed it now . Thanks for your comment – Shuhail Kadavath Aug 29 '13 at 08:58

Asking super of super

5 Answers5