topic Re: ABAP Objects in Application Development and Automation Discussions

ABAP Objects

Former Member — Tue, 08 Oct 2013 07:29:20 GMT

Hi Team,

Can we declare constructors as private/protected in ABAP objects?

Regards,

Parshuram

Re: ABAP Objects

FredericGirod — Tue, 08 Oct 2013 07:40:18 GMT

Hi,

and .. how will you create your object ??

regards

Fred

Re: ABAP Objects

Former Member — Tue, 08 Oct 2013 07:42:16 GMT

Hi,

•The constructor is a special (instance) method in a class and is always named CONSTRUCTOR.

•Each class has exactly one constructor.

•The constructor does not need to be
defined if no implementation is defined.

•The constructor is automatically called
during runtime within the CREATE OBJECT statement.

•If you need to implement the constructor,
then you must define and implement it in the PUBLIC SECTION.

Re: ABAP Objects

former_member392866 — Tue, 08 Oct 2013 07:54:16 GMT

This message was moderated.

Re: ABAP Objects

FredericGirod — Tue, 08 Oct 2013 07:57:10 GMT

Balaji,

please read who have asked the question, please use little bit size font

regards

Fred

Re: ABAP Objects

Former Member — Tue, 08 Oct 2013 07:57:54 GMT

Hi Parashuram,

You cannot declare a constructor method as protected or private. It should be Public.

Also you cannot call the constructor method explicitly using CALL METHOD statement.

It can only be invoked from the CREATE OBJECT statement used to instantiate the particular class.

Thanks,

Ajay Bose

Re: ABAP Objects

SuhaSaha — Tue, 08 Oct 2013 08:00:10 GMT

You can define the CONSTRUCTOR in all the visibility sections from ABAP Release 702 - http://help.sap.com/abapdocu_740/en/abennews-71-abap-objects.htm#!ABAP_MODIFICATION_1@1@

For prior releases you could define the instantiation level as PUBLIC, PRIVATE ,PROTECTED in the properties section of the class.

BR,

Suhas

PS - I have marked this discussion as not-a-question since this can be easily searched in the ABAP documentation.

Re: ABAP Objects

Former Member — Tue, 08 Oct 2013 08:00:54 GMT

You can not call the constructor directly then there is no need to declare the constructor as private means how you will access them..

for this use the concept of singleton class concept.

Re: ABAP Objects

RaymondGiuseppi — Tue, 08 Oct 2013 08:03:37 GMT

You can, of course , define the constructor as a private method, but then you must provide another method which will create instance and return a reference to the instance.

Regards,

Raymond

Re: ABAP Objects

SuhaSaha — Tue, 08 Oct 2013 08:05:09 GMT

Frédéric Girod wrote:
and .. how will you create your object ??

The same way use create objects for the classes in Factory and/or Singleton patterns

Cheers,

Suhas

Re: ABAP Objects

former_member219762 — Tue, 08 Oct 2013 08:19:33 GMT

Hi Parshuram,

If you declare class property Instantiation as private then we can declare constructor as private or protected. Then we cannot create object from outside the class. To get the object we have to create object in one of the method of class and set that object as return or export parameter, call that method from out side the class.

Regards,

Sreenivas.

Re: ABAP Objects

rosenberg_eitan — Tue, 08 Oct 2013 08:38:22 GMT

Hi,

I smell a Java programer camuflage as ABAPER.

This a legitimate question in cases where the class contains only static method .

Eitan.

Re: ABAP Objects

former_member392866 — Tue, 08 Oct 2013 09:29:10 GMT

Sorry Frederic...

Regards,

Balaji

Re: ABAP Objects

RaymondGiuseppi — Tue, 08 Oct 2013 09:48:32 GMT

These are declared only in public section

Well explain this to SAP developpers, there is already some hundreds of class with private constructor in a fresh SAP system (*)

Regards,

Raymond

(*) Execute SE16N on table SEOCOMPODF with method CMPNAME = 'CONSTRUCTOR' and visibility EXPOSURE = 0 private or 1 protected (ok there are more than 20K peblic constructor too )

Re: ABAP Objects

SuhaSaha — Tue, 08 Oct 2013 11:32:43 GMT

Well explain this to SAP developers, there is already some hundreds of class with private constructor in a fresh SAP system

Cliche - "Little knowledge is a dangerous thing"

It still beats me why people respond with half-known facts & add to the confusion of the already confused OP

Cheers,

Suhas

Re: ABAP Objects

FredericGirod — Tue, 08 Oct 2013 12:30:41 GMT

Because not all the people knows and understand perfectly SAP and they only tries to help others people with her knowledge.

no ?

Fred

Re: ABAP Objects

SuhaSaha — Tue, 08 Oct 2013 12:39:10 GMT

Because not all the people knows and understand perfectly SAP and they only tries to help others people with her knowledge.

I don't want to start a flamewar here, so no hard feelings

IMHO sharing knowledge is great but then share the correct one ...