Strange error in explicit instance creation

Question

Dear all,
using NW2004s I have a strange error while explicit instance creation:
Let´s say I have a class a in the Class Builder calles c1. With method "check_data".
In my program I do the following:
DATA: ref_chk TYPE REF TO object.
create object ref_chk type ('C1').
c1->check_data( );
If I do so I get an syntax error: The method check_data is unknown, private or protected.
But the method is public.
I need the explicite instance creation beacuse the class changes and I want to set it with a variable.
Any idea what´s wrong? How can I solve the problem?
Regards
Roman

Answer 1

Hi Roman,
The best way to do this would be to use an Interface and then cast the class to an interface type once it has been created. However if this is not possible (i.e. the interface is not fixed for all the different classes you want to create) you can use the following code to call your class.
DATA: ref_chk TYPE REF TO object.
create object ref_chk type ('C1').
call method ref_chk->('CHECK_DATA').
Just a note the 'CHECK_DATA' in brackets can also be replaced with a variable as in the follwing example:
DATA: ref_chk TYPE REF TO object.
DATA: method_name type string.
create object ref_chk type ('C1').
method_name = 'CHECK_DATA'.
call method ref_chk->(method_name).
Cheers,
  De Wildt