Creating Interface in ABAP Objects with example

*&---------------------------------------------------------------------*
*& Report Z_06
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*

REPORT ZKRISH_OOPS_06.
*----------------------------------------------------------------------*
* INTERFACE i_data
*----------------------------------------------------------------------*
INTERFACE I_DATA.
METHODS: CREATE,CHANGE,DISPLAY.
ENDINTERFACE. "i_data

PARAMETERS: PO RADIOBUTTON GROUP R1 USER-COMMAND ABCD.
PARAMETERS: SO RADIOBUTTON GROUP R1.
SELECTION-SCREEN: ULINE.
PARAMETERS: CR RADIOBUTTON GROUP R2 USER-COMMAND ABCDE.
PARAMETERS: CH RADIOBUTTON GROUP R2.
PARAMETERS: DI RADIOBUTTON GROUP R2.


*----------------------------------------------------------------------*
* CLASS c1 DEFINITION
*----------------------------------------------------------------------*
CLASS C1 DEFINITION.
PUBLIC SECTION.
INTERFACES: I_DATA.
ENDCLASS. "c1 DEFINITION
*----------------------------------------------------------------------*
* CLASS c1 IMPLEMENTATION
*----------------------------------------------------------------------*
CLASS C1 IMPLEMENTATION.
METHOD: I_DATA~CREATE.
CALL TRANSACTION 'ME21N'.
ENDMETHOD. "i_data~create
METHOD: I_DATA~CHANGE.
CALL TRANSACTION 'ME22N'.
ENDMETHOD. "i_data~cHANGE
METHOD: I_DATA~DISPLAY.
CALL TRANSACTION 'ME23N'.
ENDMETHOD. "i_data~DISPLAY
ENDCLASS. "c1 IMPLEMENTATION

*----------------------------------------------------------------------*
* CLASS C2 DEFINITION
*----------------------------------------------------------------------*
CLASS C2 DEFINITION.
PUBLIC SECTION.
INTERFACES: I_DATA.
ENDCLASS. "C2 DEFINITION


*----------------------------------------------------------------------*
* CLASS C2 IMPLEMENTATION
*----------------------------------------------------------------------*
CLASS C2 IMPLEMENTATION.
METHOD: I_DATA~CREATE.
CALL TRANSACTION 'VA01'.
ENDMETHOD. "i_data~create
METHOD: I_DATA~CHANGE.
CALL TRANSACTION 'VA02'.
ENDMETHOD. "i_data~cHANGE
METHOD: I_DATA~DISPLAY.
CALL TRANSACTION 'VA03'.
ENDMETHOD. "i_data~DISPLAY
ENDCLASS. "C2 IMPLEMENTATION

START-OF-SELECTION.
DATA: O1 TYPE REF TO C1.
CREATE OBJECT O1.
DATA: O2 TYPE REF TO C2.
CREATE OBJECT O2.

DATA: IREF TYPE REF TO I_DATA.
IF PO = 'X'.
IREF = O1.
ELSE.
IREF = O2.
ENDIF.
IF CR = 'X'.
CALL METHOD IREF->CREATE.
ELSEIF CH = 'X'.
CALL METHOD IREF->CHANGE.
ELSE.
CALL METHOD IREF->DISPLAY.
ENDIF.