OOPs ABAP question (2)

[Former Member]

Hi all.

In this simple code example. I would like to know why this line of code generates an error.  CL_SALV_TABLE->DISPLAY( ).

************************************************

DATA : IT_MARA TYPE TABLE OF MARA.

DATA : LR_ALV  TYPE REF TO CL_SALV_TABLE.

SELECT * FROM MARA INTO TABLE IT_MARA UP TO 50 ROWS.

   CALL METHOD CL_SALV_TABLE=>FACTORY

     IMPORTING

       R_SALV_TABLE = LR_ALV

     CHANGING

       T_TABLE      = IT_MARA.

****  LR_ALV->DISPLAY( ).                "correct

   CL_SALV_TABLE->DISPLAY( ).      "error

********************************

Q : Isn't  the last statement similar to this one : CALL METHOD CL_SALV_TABLE->DISPLAY( )

which is similar to CALL METHOD CL_SALV_TABLE=>FACTORY ?

FACTORY & DISPALY are both methods of the class CL_SALV_TABLE, except that DISPLAY has no import or export parameters. why calling it,  is causing an issue ?

Thank you.

[JK]

hi sami

the difference is:

CL_SALV_TABLE=>FACTORY is a STATIC Method, where

CL_SALV_TABLE->DISPLAY is a INSTANCE Method, so you cannot Access it over the Classname but you can use a REF TO variable (LR_ALV)

[rosenberg_eitan]

Hi,

You are missing basic OO knowledge.

See here http://help.sap.com/abapdocu_740/en/abenabap_objects_oview.htm

Regards.

[thokane]

Hi,

FACTORY is static method.

DISPLAY is instance method.

check the syntax for method call

http://help.sap.com/saphelp_nw70/helpdata/en/08/d27c03b81011d194f60000e8353423/content.htm