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Polymophism via inheritance



 
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Joined: 01 Sep 2007
Posts: 1640
PostPosted: Fri Sep 21, 2007 5:04 pm    Post subject: Polymophism via inheritance Reply with quote
Code:
REPORT s_polymophism_via_inheritance.

* Class Declarations

CLASS ship DEFINITION ABSTRACT.
  PUBLIC SECTION.
    METHODS: get_max_range ABSTRACT
               RETURNING value(r_range) TYPE f,
             get_name
               RETURNING value(r_name) TYPE string.
  PROTECTED SECTION.
    DATA name TYPE string.
ENDCLASS.

*

CLASS motorship DEFINITION INHERITING FROM ship.
  PUBLIC SECTION.
    METHODS: constructor IMPORTING
               value(i_name) TYPE string
               value(i_fuel_consumption) TYPE f
               value(i_fuel_amount) TYPE f,
             get_max_range REDEFINITION.
  PROTECTED SECTION.
    DATA: fuel_consumption TYPE f,
          fuel_amount TYPE f.
ENDCLASS.

*

CLASS sailingship DEFINITION INHERITING FROM ship.
  PUBLIC SECTION.
    METHODS: constructor IMPORTING
               value(i_name) TYPE string
               value(i_range_per_wind_speed) TYPE f
               value(i_wind_speed) TYPE f
               value(i_wind_duration) TYPE f,
             get_max_range REDEFINITION.
  PROTECTED SECTION.
    DATA: range_per_wind_speed TYPE f,
          wind_speed TYPE f,
          wind_duration TYPE f.
ENDCLASS.

* Class Implementations

CLASS ship IMPLEMENTATION.
  METHOD get_name.
    r_name = name.
  ENDMETHOD.
ENDCLASS.

*

CLASS motorship IMPLEMENTATION.
  METHOD constructor.
    name = i_name.
    fuel_consumption = i_fuel_consumption.
    fuel_amount = i_fuel_amount.
  ENDMETHOD.
  METHOD get_max_range.
    r_range = fuel_amount / fuel_consumption.
  ENDMETHOD.
ENDCLASS.

*

CLASS sailingship IMPLEMENTATION.
  METHOD constructor.
    name = i_name.
    range_per_wind_speed = i_range_per_wind_speed.
    wind_speed = i_wind_speed.
    wind_duration = i_wind_duration.
  ENDMETHOD.
  METHOD get_max_range.
    r_range = wind_speed /
              range_per_wind_speed * wind_duration.
  ENDMETHOD.
ENDCLASS.

* Global Data

DATA: o_ship TYPE REF TO ship,
      ship_tab TYPE TABLE OF REF TO ship.

DATA: name TYPE string,
      range TYPE f.

* Classical Processing Blocks

START-OF-SELECTION.

  CREATE OBJECT o_ship TYPE motorship
         EXPORTING i_name = 'Motor Ship Wanda'
                   i_fuel_consumption = '0.2'
                   i_fuel_amount = 80.
  APPEND o_ship TO ship_tab.

  CREATE OBJECT o_ship TYPE sailingship
         EXPORTING i_name = 'Sailing Ship Black Magic'
                   i_range_per_wind_speed = 25
                   i_wind_speed = 60
                   i_wind_duration = 5.
  APPEND o_ship TO ship_tab.

  LOOP AT ship_tab INTO o_ship.
    name = o_ship->get_name( ).
    range = o_ship->get_max_range( ).
    WRITE: / 'Range of', name, 'is',
              range EXPONENT 0 DECIMALS 2, 'Miles'.
  ENDLOOP.
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