Parameterized constructor in ABAP

Like normal methods constructor methods can import parameters ,but since the constructor
methods cannot be called like normal methods ,so how do we pass the parameters to
constructor methods??

We can pass the parameters to a constructor methods during the object creation i.e while
using “create object” statement. A point to note a constructor cannot export any parameter.

Code:



CLASS test DEFINITION.
PUBLIC SECTION.
METHODS: print_private_data,
CONSTRUCTOR IMPORTING num TYPE I. “constructor importing parameter

PRIVATE SECTION.
DATA: private_num TYPE I.

ENDCLASS.

CLASS test IMPLEMENTATION.
METHOD print_private_data.
WRITE:/ private_num.
ENDMETHOD.
METHOD CONSTRUCTOR. “this constructor initializes the private member with the
private_num = num. “ constructor parameter

ENDMETHOD.
ENDCLASS.
************* main program ******************************
START-OF-SELECTION.
DATA: my_obj_ref TYPE REF TO test.
CREATE OBJECT : my_obj_ref EXPORTING num = 2.
CALL METHOD my_obj_ref->print_private_data.