CodeTheta

Constructor is a method used to initialize the attributes of the class.

Key Point:
1. It will be called automatically whenever an object is created.
2. Constructor always declared in the public section of the class.
3. Constructor doesn't return any value.

There are 2 types of constructor
Static Constructor:
It is declared using the 'class_constructor' keyword.
It cannot contain any parameters and exceptions.

Instance Constructor:
It is declared using 'constructor' keyword.
They can contain only importing parameters and exceptions.

Instance Constructor demo program:
CLASS cl_main DEFINITION.
  PUBLIC SECTION.
    DATA: empnum TYPE i,
          empname TYPE char10.

    METHODS: constructor, "instance constructor
             display.

ENDCLASS.

CLASS cl_main IMPLEMENTATION.

  METHOD constructor.
    empnum = '10'.
    empname = 'Amit'.
  ENDMETHOD.

  METHOD display.
    WRITE:/ empnum, empname.
  ENDMETHOD.

ENDCLASS.

START-OF-SELECTION.
  DATA ob TYPE REF TO cl_main.
  CREATE OBJECT ob.

  CALL METHOD ob->display.

Static Constructor Demo Program:
CLASS cl_main DEFINITION.
  PUBLIC SECTION.
    CLASS-DATA: empnum  TYPE i,
                empname TYPE char10.

    CLASS-METHODS: class_constructor,
                   display.
ENDCLASS.

CLASS cl_main IMPLEMENTATION.

  METHOD class_constructor.
    empnum = '10'.
    empname = 'Amit'.
  ENDMETHOD.

  METHOD display.
    WRITE:/ empnum, empname.
  ENDMETHOD.

ENDCLASS.

START-OF-SELECTION.
  CALL METHOD cl_main=>display.

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