How to make interface work ?

[Former Member]

Hello SDNers,

I have written the below snippet.

Can any one explain now to call the method of the following 2 classes which are implemented within the interdace intf_counter..

REPORT  ZNRD_CLASS_INTERFACE1.

interface intf_counter.
  methods : set_counter importing value(set_value) type i,
            increment_counter,
            get_counter exporting value(get_value) type i.
endinterface.

class lcl_counter1 definition.
public section.
  interfaces intf_counter.
private section.
  data : count type i.
endclass.

class lcl_counter1 implementation.

  method intf_counter~set_counter.
  count = set_value.
  endmethod.

  method intf_counter~increment_counter.
    add 1 to count.
  endmethod.

  method intf_counter~get_counter.
    get_value = count.
  endmethod.
endclass.

class lcl_counter2 definition.
public section.
   interfaces intf_counter.
private section.
  data : count type i.
endclass.

class lcl_counter2 implementation.

method intf_counter~set_counter.
  count = ( set_value / 10 ) * 10.
endmethod.

method intf_counter~increment_counter.
  if count ge 100.
    write:/ 'Count greater than 100 '.
    count = 0.
  else.
    add 10 to count.
  endif.
endmethod.

method intf_counter~get_counter.
  get_value = count.
endmethod.
endclass.

Regards,

Ranjith N

[narin_nandivada3]

Please check the following Snippet...

Data: w_ref1 type ref to lcl_counter1,
         w_ref2 type ref to lcl_counter2.

* Calling class1 interface methods............................
call method w_ref1->intf_counter~set_counter.
call method w_ref1->intf_counter~increment_counter.
call method w_ref1->intf_counter~get_counter.

* in the same way call the second class methods.

Hope this would help you.

Good luck

Narin.

[uwe_schieferstein]

Hello

Assuming that you interface methods are (public) instance methods you first need to create an instance of your class.

*&---------------------------------------------------------------------*
*& Report  ZNRD_CLASS_INTERFACE1
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*

REPORT  znrd_class_interface1.


*----------------------------------------------------------------------*
*       INTERFACE intf_counter
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
INTERFACE intf_counter.
  METHODS : set_counter IMPORTING value(set_value) TYPE i,
            increment_counter,
            get_counter EXPORTING value(get_value) TYPE i.
ENDINTERFACE.                    "intf_counter

*----------------------------------------------------------------------*
*       CLASS lcl_counter1 DEFINITION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS lcl_counter1 DEFINITION.
  PUBLIC SECTION.
    INTERFACES intf_counter.
  PRIVATE SECTION.
    DATA : count TYPE i.
ENDCLASS.                    "lcl_counter1 DEFINITION

*----------------------------------------------------------------------*
*       CLASS lcl_counter1 IMPLEMENTATION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS lcl_counter1 IMPLEMENTATION.

  METHOD intf_counter~set_counter.
    count = set_value.
  ENDMETHOD.                    "intf_counter~set_counter

  METHOD intf_counter~increment_counter.
    ADD 1 TO count.
  ENDMETHOD.                    "intf_counter~increment_counter

  METHOD intf_counter~get_counter.
    get_value = count.
  ENDMETHOD.                    "intf_counter~get_counter
ENDCLASS.                    "lcl_counter1 IMPLEMENTATION

*----------------------------------------------------------------------*
*       CLASS lcl_counter2 DEFINITION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS lcl_counter2 DEFINITION.
  PUBLIC SECTION.
    INTERFACES intf_counter.
  PRIVATE SECTION.
    DATA : count TYPE i.
ENDCLASS.                    "lcl_counter2 DEFINITION

*----------------------------------------------------------------------*
*       CLASS lcl_counter2 IMPLEMENTATION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS lcl_counter2 IMPLEMENTATION.

  METHOD intf_counter~set_counter.
    count = ( set_value / 10 ) * 10.
  ENDMETHOD.                    "intf_counter~set_counter

  METHOD intf_counter~increment_counter.
    IF count GE 100.
      WRITE:/ 'Count greater than 100 '.
      count = 0.
    ELSE.
      ADD 10 TO count.
    ENDIF.
  ENDMETHOD.                    "intf_counter~increment_counter

  METHOD intf_counter~get_counter.
    get_value = count.
  ENDMETHOD.                    "intf_counter~get_counter
ENDCLASS.                    "lcl_counter2 IMPLEMENTATION


DATA:
  go_counter    TYPE REF TO lcl_counter1,
  gif_counter    TYPE REF TO intf_counter.

START-OF-SELECTION.

  CREATE OBJECT go_counter.
  CALL METHOD go_counter->intf_counter~set_counter( set_value = 1 ).

  " Or:

  gif_counter ?= go_counter.
  CALL METHOD gif_counter->set_counter( set_value = 1 ).

  " Or:
  CREATE OBJECT gif_counter type ('LCL_COUNTER1').
  CALL METHOD gif_counter->set_counter( set_value = 1 ).


END-OF-SELECTION.

Regards

Uwe

[Former Member]

answered