ABAP - OOPS: Instance Constructors Fired At The Time Of Class Instantiation

REPORT YSUBOOPS1.

CLASS C1 DEFINITION.
PUBLIC SECTION.
METHODS : CONSTRUCTOR .
ENDCLASS.

CLASS C1 IMPLEMENTATION.
METHOD constructor.
WRITE:/5 'I am constructor'.
skip 2.
ENDMETHOD.
ENDCLASS.
*************** main program **************
START-OF-SELECTION.
DATA: obj1 TYPE REF TO c1.
CREATE OBJECT: obj1.


Output:

I am constructor