How to execute java method in abstract class?

Question

I have a method in abstract class that may be overriden in extended class or not. I'd like to call the original (not overriden) method. How to reference it? Example:

public abstract class A{

  protected MyResult my_method(){
    MyResult myResult;
    ...
    ... // Default implementation
    ...
    return myResult;
  }

 ...

 private void xy(){
   // I'd like to call my_method here
   if(!my_method().test()){
     // The function is not implemented well, I want ot use the original (abstract) method
     ...
     ... log a message for programmer
     ...
     this::A.my_method(); // I need something like this
   }
 }
}

I don't need any advice how to do it by different way. I only ask if there is a java syntax for referencing methods or properties in original class or in distant super-class.

Jon Skeet · Accepted Answer · 2014-10-30 14:28:41Z

2

I'd like to call the original (not overriden) method.

You can't do that from outside the subclass. From the subclass itself, you can call

super.my_method();

which will always call the superclass implementation, even if it's been overridden in this class. But to be able to do that outside the subclass would reduce encapsulation.

answered Oct 30, 2014 at 14:28

Jon Skeet

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3 Comments

Hink Over a year ago

Your suggestion is usable in class B which extends A. I need to call it from a method written in A class.

Jon Skeet Over a year ago

@Hink: You can't do that. If you want to call code in class A from class A, put it in a final method to avoid the subclass being able to override it.

Hink Over a year ago

Ok, I belive You, I must reconcile with it.

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