OO ABAP - Deferred in class

*&---------------------------------------------------------------------*
*& Report  YSAP_CLASS_DEFFERED
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*

REPORT  ysap_class_deffered.

PARAMETERS: a TYPE i,
            b TYPE i.

CLASS class2 DEFINITION DEFERRED.



*----------------------------------------------------------------------*
*       CLASS class1 DEFINITION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS class1 DEFINITION.
  PUBLIC SECTION.
    DATA: object2 TYPE REF TO class2.
ENDCLASS.                    "class1 DEFINITION


*----------------------------------------------------------------------*
*       CLASS class2 DEFINITION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS class2 DEFINITION.
  PUBLIC SECTION.
    METHODS: sum.
    DATA: num TYPE i .
ENDCLASS.                    "class2 DEFINITION

*----------------------------------------------------------------------*
*       CLASS class2 IMPLEMENTATION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS class2 IMPLEMENTATION.
  METHOD sum.
    num = a + b.
    WRITE: num.
  ENDMETHOD.                    "sum
ENDCLASS.                    "class2 IMPLEMENTATION

START-OF-SELECTION.
  DATA:  object1 TYPE REF TO class1.
  CREATE OBJECT: object1.
  CREATE OBJECT: object1->object2.

  CALL METHOD: object1->object2->sum.


 


Output: