Übung Schrödinger: 09 Vererbung (ABAP)

Beispiellisting für Vererbung in lokalen Klassen aus Kapitel 09 im Buch Schrödinger programmiert ABAP.

REPORT zsch_matt_beer.

CLASS lcl_bier DEFINITION.
  PUBLIC SECTION.
    DATA: gd_stammwuerze TYPE p LENGTH 3 DECIMALS 2 VALUE '12.50'.
    TYPES: gdt_alkoholgehalt LIKE gd_stammwuerze.
    METHODS: write_stammwuerze,
             write_volumen,
             set_alkoholgehalt
             IMPORTING id_alkoholgehalt TYPE gdt_alkoholgehalt,
             brauen.
  PROTECTED SECTION.
    DATA: gd_volumen TYPE p LENGTH 4 DECIMALS 2 VALUE 333.
  PRIVATE SECTION.
    DATA: gd_alkoholgehalt TYPE gdt_alkoholgehalt VALUE '4.50'.
ENDCLASS.

CLASS lcl_bier IMPLEMENTATION.
  METHOD write_stammwuerze.
    WRITE:  / `Stammwürze: `, me->gd_stammwuerze.
  ENDMETHOD.

  METHOD write_volumen.
    WRITE:  / `Volumen: `, me->gd_volumen.
  ENDMETHOD.

  METHOD set_alkoholgehalt.
    me->gd_alkoholgehalt = id_alkoholgehalt.
  ENDMETHOD.

  METHOD brauen.
    WRITE: / 'Ich braue und braue Bier den ganzen lieben langen Tag.'.
  ENDMETHOD.
ENDCLASS.

CLASS lcl_bier_untergaerig DEFINITION INHERITING FROM lcl_bier.
  PUBLIC SECTION.
    METHODS: brauen REDEFINITION.
  PROTECTED SECTION.
  PRIVATE SECTION.
ENDCLASS.

CLASS lcl_bier_untergaerig IMPLEMENTATION.
  METHOD brauen.
    CALL METHOD super->brauen.
    WRITE: / 'Sogar untergärig'.
  ENDMETHOD.
ENDCLASS.

CLASS lcl_koelsch DEFINITION INHERITING FROM lcl_bier.
  PUBLIC SECTION.
  PROTECTED SECTION.
  PRIVATE SECTION.
ENDCLASS.

CLASS lcl_koelsch IMPLEMENTATION.
ENDCLASS.

DATA: gr_untergaerig TYPE REF TO lcl_bier_untergaerig.

START-OF-SELECTION.

  CREATE OBJECT gr_untergaerig.
  CALL METHOD gr_untergaerig->write_stammwuerze.
  CALL METHOD gr_untergaerig->write_volumen.
  CALL METHOD gr_untergaerig->brauen.