Structure of includes

Question

Hi,
in Java developing I am using for everey new class a new file. Is it usual in ABAP to use  for every local class a new include? I tried it and get in real problems. I wrote two classes in different includes. Both classes were using each other. I didn't know where to set which include and which class should be defined as deferred.
Can anybody give me a short answer or a link to something that documents it.
Thanks.
Adalbert

Answer 1

Hello Adalbert
Perhaps there is a more elegant approach than the one shown below but I did not find another solution.
The coding of the include is shown after the END-OF-SELECTION statement.
*& Report  ZUS_SDN_INCL_LOCAL_CLASSES
REPORT  zus_sdn_incl_local_classes.
CLASS lcl_myclass_2 DEFINITION DEFERRED.
CLASS lcl_myclass_1 DEFINITION DEFERRED.
INCLUDE zus_sdn_incl_local_classes_c01. " Definition class 1
INCLUDE zus_sdn_incl_local_classes_c02. " Definition class 2
INCLUDE zus_sdn_incl_local_classes_c03. " Implementation 1 & 2
START-OF-SELECTION.
END-OF-SELECTION.
*&  Include           ZUS_SDN_INCL_LOCAL_CLASSES_C01
CLASS lcl_myclass_1 DEFINITION.
  PUBLIC SECTION.
    DATA:
      mo_class_2    TYPE REF TO lcl_myclass_2.
    METHODS:
      constructor.
ENDCLASS.                    "lcl_myclass_1 DEFINITION
*&  Include           ZUS_SDN_INCL_LOCAL_CLASSES_C02
CLASS lcl_myclass_2 DEFINITION.
  PUBLIC SECTION.
    DATA:
      mo_class_1    TYPE REF TO lcl_myclass_1.
    METHODS:
      constructor.
ENDCLASS.                    "lcl_myclass_1 DEFINITION
*&  Include           ZUS_SDN_INCL_LOCAL_CLASSES_C03
*       CLASS lcl_myclass_1 IMPLEMENTATION
CLASS lcl_myclass_1 IMPLEMENTATION.
  METHOD constructor.
    CREATE OBJECT me->mo_class_2.
  ENDMETHOD.                    "constructor
ENDCLASS.                    "lcl_myclass_1 IMPLEMENTATION
*       CLASS lcl_myclass_1 IMPLEMENTATION
CLASS lcl_myclass_2 IMPLEMENTATION.
  METHOD constructor.
    CREATE OBJECT me->mo_class_1.
  ENDMETHOD.                    "constructor
ENDCLASS.                    "lcl_myclass_1 IMPLEMENTATION
Regards
  Uwe