Posted: Fri Feb 08, 2008 4:28 pm Post subject: Статический и инстанс конструктор
Привет!
Пытаюсь разобраться с работой классов. Сделал небольшую программу с тремя классами C1, C2.
Класс C2 наследуется от C1.
Какая последовательность вызова статического и инстанс конструкторов классов C1 и С2?
Вот немного модифицированный пример из курса BC404
Quote:
The static constructor is a special static method in a class and is always named CLASS_CONSTRUCTOR. It is executed precisely once per program. The static constructor of class <classname> is called automatically before the class is first accessed, that is, before any of the following actions are executed:
Creating an instance in the class using CREATE OBJECT obj, where obj has the data type
REF TO <classname>.
Addressing a static attribute using <classname>=><an_attribute>.
Calling a static attribute using CALL METHOD <classname>=><a_classmethod>.
Registering a static event handler method using SET HANDLER <classname>=><handler_method> for obj.
Registering an event handler method for a static event in class <classname>.
The static constructor cannot be called explicitly.
Code:
CLASS lcl_airplane DEFINITION.
PUBLIC SECTION.
TYPES: name_type(25) TYPE c.
CONSTANTS: pos_1 TYPE i VALUE 30.
* Constructor
METHODS: constructor importing
im_name TYPE name_type
im_planetype TYPE saplane-planetype,
set_attributes IMPORTING
im_name TYPE name_type
im_planetype TYPE saplane-planetype,
display_attributes.
DATA: name TYPE name_type,
planetype TYPE saplane-planetype.
CLASS-DATA: n_o_airplanes TYPE i.
ENDCLASS.
*------------------------------------------------------------------*
* CLASS lcl_airplane IMPLEMENTATION *
*------------------------------------------------------------------*
CLASS lcl_airplane IMPLEMENTATION.
METHOD display_attributes.
WRITE: / 'Name of the airplane: '(001), at pos_1 name,
/ 'Plane type: '(002), at pos_1 planetype.
ENDMETHOD.
METHOD display_n_o_airplanes.
WRITE: /, / 'Total number of airplanes: '(ca1),
AT pos_1 n_o_airplanes left-justified, /.
ENDMETHOD.
ENDCLASS.
*------------------------------------------------------------------*
* CLASS lcl_cargo_airplane DEFINITION *
*------------------------------------------------------------------*
CLASS lcl_cargo_airplane DEFINITION INHERITING FROM lcl_airplane.
PUBLIC SECTION.
METHODS: constructor IMPORTING
im_name TYPE name_type
im_planetype TYPE saplane-planetype
im_cargo_max TYPE p,
display_attributes REDEFINITION.
*------------------------------------------------------------------*
* CLASS lcl_cargo_airplane IMPLEMENTATION *
*------------------------------------------------------------------*
CLASS lcl_cargo_airplane IMPLEMENTATION.
Instance Constructor of Class lcl_airplane
Static Constructor of lcl_cargo_airplane
Instance Constructor of Class lcl_airplane
Instance Constructor of Class lcl_cargo_airplane
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