Redefinition

*&---------------------------------------------------------------------*
*& Report ZMENG_REDEFINE
*&---------------------------------------------------------------------*
*&  sap_abap/sap_abap_inheritance.html
*&---------------------------------------------------------------------*
REPORT zmeng_07_redefinition.

CLASS super_class DEFINITION.
  PUBLIC SECTION.
  METHODS: addition1 IMPORTING g_a TYPE i
                               g_b TYPE i
         EXPORTING g_c TYPE i.
ENDCLASS.

CLASS super_class IMPLEMENTATION.
  METHOD addition1.
    g_c = g_a + g_b.
  ENDMETHOD.
ENDCLASS.

CLASS sub_class DEFINITION INHERITING FROM super_class.
  PUBLIC SECTION.
  "如果重新定义一个方法，则不需要在子类中再次输入其接口，而只需要输入方法的名称。
  METHODS: addition1 REDEFINITION.
ENDCLASS.

CLASS sub_class IMPLEMENTATION.
  METHOD addition1.
    g_c = g_a + g_b + 10.
  ENDMETHOD.
ENDCLASS.

START-OF-SELECTION.
  PARAMETERS: p_a TYPE i, p_b TYPE i.

  DATA: h_addition1 TYPE i.
  DATA: h_sub TYPE i.

  DATA: ref1 TYPE REF TO sub_class.

  CREATE OBJECT ref1.

  CALL METHOD ref1->addition1
    EXPORTING g_a = p_a
              g_b = p_b
    IMPORTING g_c = h_addition1.

  WRITE:/ h_addition1.