topic Re: Call an abstract method in Application Development and Automation Discussions

Call an abstract method

Nicolas — Mon, 28 Apr 2014 09:36:33 GMT

Hello developers,

I am trying to implement the following (simple) classes:

class abstract_class definition abstract

public

create public .

...

protected section

methods parse_string abtract

importing

value(i_str) type string.

methods to_table.

...

endclass.

class abstract_class implementation.

method to_table.

...

me->parse_string( str ).

...

endmethod.

endclass.

*---------------------------------------------------------------------------*

class other_class definition

public

inheriting from abstract_class

final

create public .

...

protected section.

methods parse_string redefinition.

...

endclass.

class other_class implementation.

method parse_string.

* some codes

endmethod.

endclass.

I have instantiated the class other_class. But when I call the method to_table, I am getting the error "CALL METHOD NOT IMPLEMENTED" on the method parse_string. Where is my mistake ?

Thank you for your replies.

Best regards,

Nicolas

Re: Call an abstract method

Former Member — Mon, 28 Apr 2014 09:43:04 GMT

This message was moderated.

Re: Call an abstract method

Former Member — Mon, 28 Apr 2014 09:43:07 GMT

Hi Nicolas,

Can you upload a txt of your code so it could be analyzed it is difficult to see like this...

Thanks

Re: Call an abstract method

former_member205488 — Mon, 28 Apr 2014 16:42:15 GMT

Hello, Nicolas!

How did you instantiated the object? How did you called the method? Could I look at your code?

If you did it like this, it should work fine:

DATA: lo_other TYPE REF TO other_class

CREATE OBJECT lo_other.

lo_other->to_table( ).

Re: Call an abstract method

Former Member — Mon, 28 Apr 2014 22:19:02 GMT

Hello Nicolas,

Abstract classes are only for declaration. You can not implement them. Remove the implementation of your abstract class. (comment out or delete the following lines of code from you program and check again:).

class abstract_class implementation.

method to_table.

...

me->parse_string( str ).

...

endmethod.

endclass.

You can only implement the subclasses of the abstract class.

Thanks,

John.

Re: Call an abstract method

matt — Tue, 29 Apr 2014 05:09:22 GMT

But John, to_table isn't abstract. The abstract method is parse_string.

To really help, we need the code where you instantiate the class and call the method. As it stands, there are no accessible methods in the class - they're all protected. There is not one that is public.

Re: Call an abstract method

Former Member — Tue, 29 Apr 2014 05:18:14 GMT

hi,

did u call the object of the class other_class.i think you have called the abstract class (abstract_class)object .

Re: Call an abstract method

Nicolas — Tue, 29 Apr 2014 05:58:41 GMT

Hello everyone,

First of all, thank you for all your reply.

During the night, I have thought to my problem and I found the solution. In fact, I made a (very) great mistake. Here is my code:

CLASS abstract_class IMPLEMENTATION.

method constructor.

me->to_table( ).

endmethod.

method to_table.

...

me->parse_string( a_string ).

...

endmethod.

ENDCLASS.

CLASS other_class IMPLEMENTATION.

method constructor.

call method super->constructor.

endmethod.

method parse_string.

* some code

endmethod.

ENDCLASS.

The problem is: I call the method parse_string of my child class (with the instruction me->parse_string) before my child class is instantiated... (Now, I can jump out the window.) Vadim Vologzhanin 's reply helped me by asking where I instantiated my child class.

Thank you !

Best regards,

Nicolas