Can we use overload and overwrite concept in OO-abap

Question

hi
can we use overload and overwrite concept in OO-abap

Answer 1

Hi
CLASS zl_lcl_vehicle DEFINITION.
PUBLIC SECTION.
Signature of method
METHODS: set_make
IMPORTING value(im_make) TYPE string " Pass by value
im_model TYPE string," Pass by reference
ENDCLASS. "zl_lcl_vehicle DEFINITION
CLASS zl_lcl_vehicle IMPLEMENTATION.
Implementation of method.
METHOD set_make.
IF im_make IS NOT INITIAL
AND im_model IS NOT INITIAL.
gv_make = im_make.
gv_model = im_model.
ENDIF.
ENDMETHOD. "set_make
ENDCLASS. "zl_lcl_vehicle
Overloading means changing signature as well as implementation of a method.
Overriding is changing only implementation of method with signature unchanged.
From ABAP perspective, only the CONSTRUCTOR method can be overloaded in a subclass i.e both the signature and implementation can be adapted in subclass.
Any other method can't be overloaded. It can only be redefined/overridden i.e implementation changed with signature unchanged.
In ABAP  there is something called a redefinition.
When you inherit a class from a super class, you can redifne a method. You cannot chnage the signature( Interface) of the method. It will remain the same as that of the super class.You must redefine a method in the same visibility section in which it appears in the superclass.
Eg.
CLASS C_SUPER_CLASS DEFINITION .
PUBLIC SECTION.
METHODS: DRIVE ,
STOP.
PROTECTED SECTION.
DATA SPEED TYPE I.
ENDCLASS.
CLASS C_SUPER_CLASS IMPLEMENTATION.
METHOD DRIVE.
SPEED = 0.
WRITE: / 'Bike speed =', SPEED.
ENDMETHOD.
ENDCLASS.
CLASS C_SUB_CLASS DEFINITION INHERITING FROM C_SUPER_CLASS.
PUBLIC SECTION.
METHODS DRIVE REDEFINITION.
ENDCLASS
CLASS C_SUB_CLASS IMPLEMENTATION.
METHOD DRIVE.
SPEED = SPEED + 10.
WRITE: / 'Bicycle speed =', SPEED.
ENDMETHOD.
ENDCLASS.
Regards
Vasu