REPORT  Z17_021                                                     .

*       INTERFACE status

INTERFACE status.
        METHODS write.
        DATA cnt TYPE i.
ENDINTERFACE.                    "status

*       CLASS c_counter1 DEFINITION
CLASS c_counter1 DEFINITION.
        PUBLIC SECTION.
                INTERFACES status.
     METHODS increment.
ENDCLASS.                    "c_counter1 DEFINITION


*       CLASS c_counter1 IMPLEMENTATION
CLASS c_counter1 IMPLEMENTATION.
        METHOD status~write.
                WRITE: / '숫자는', status~cnt.
        ENDMETHOD.                    "status~write
METHOD increment.
    ADD 2 TO status~cnt.
  ENDMETHOD.
ENDCLASS.                    "c_counter1 IMPLEMENTATION


*       CLASS c_counter2 DEFINITION
CLASS c_counter2 DEFINITION.
        PUBLIC SECTION.
                INTERFACES status.
ENDCLASS.                    "c_counter2 DEFINITION

*       CLASS c_counter2 IMPLEMENTATION
CLASS c_counter2 IMPLEMENTATION.
        METHOD status~write.
                WRITE: / '속도는', status~cnt.
        ENDMETHOD.                    "status~write

ENDCLASS.                    "c_counter2 IMPLEMENTATION

DATA : cref1 TYPE REF TO c_counter1,
                cref2 TYPE REF TO c_counter2,
                iref  TYPE REF TO status.

START-OF-SELECTION.

        CREATE OBJECT : cref1, cref2.


      CALL METHOD CREF1->INCREMENT.
        CALL METHOD cref1->status~write.
        iref = cref1.
        cref1->status~cnt = 3.
        CALL METHOD iref->write.

        cref2->status~cnt = 10.
        CALL METHOD cref2->status~write.

        iref = cref2.
        cref2->status~cnt = 20.
                CALL METHOD iref->write.