topic Re: Instantiate a ABAP Object Dynamically in Application Development and Automation Discussions

Instantiate a ABAP Object Dynamically

Former Member — Thu, 07 Dec 2006 18:41:53 GMT

I would like to get some guidance on Dynamically instantiating objects within ABAP.

I have worked with Java. Within Java I am able to instantiate a Java object through the use Class.forName (see example below):

className = "com.vz.it.cleansheet.eFine.db.query.WBRDMTWKCNDATABEAN";

try {

singleton = (Object) Class.forName(classname).newInstance();

} catch (ClassNotFoundException cnf) {

System.out.println("SingletonRegistry - Couldn't find class "}

Is there a similar procedure in ABAP OO to enable dynamically instantiating a ABAP object?

I would appreciate any advice.

Thanks,

Rick

Re: Instantiate a ABAP Object Dynamically

RichHeilman — Thu, 07 Dec 2006 18:54:39 GMT

You can instantiate an object dynamically, here is a sample program. Notice that we are creating an object passed on what class is named in the selection screen.



report zrich_0001.

*---------------------------------------------------------------------*
*       CLASS lcl_car DEFINITION
*---------------------------------------------------------------------*
*       ........                                                      *
*---------------------------------------------------------------------*
class lcl_car definition.

  public section.

    data: car type string.

endclass.

*---------------------------------------------------------------------*
*       CLASS lcl_car IMPLEMENTATION
*---------------------------------------------------------------------*
*       ........                                                      *
*---------------------------------------------------------------------*
class lcl_car implementation.

endclass.


*---------------------------------------------------------------------*
*       CLASS lcl_truck DEFINITION
*---------------------------------------------------------------------*
*       ........                                                      *
*---------------------------------------------------------------------*
class lcl_truck definition.

  public section.

    data: truck type string.

endclass.

*---------------------------------------------------------------------*
*       CLASS lcl_truck IMPLEMENTATION
*---------------------------------------------------------------------*
*       ........                                                      *
*---------------------------------------------------------------------*
class lcl_truck implementation.

endclass.


data: r  type ref to object.

parameters: p_class(20) type c default 'LCL_TRUCK'.

start-of-selection.

  create object r type (p_class).

  check sy-subrc = 0.

Regards,

Rich Heilman

Re: Instantiate a ABAP Object Dynamically

Former Member — Mon, 11 Dec 2006 10:55:23 GMT

Check this sample as well. I hope it helped you.

REPORT ZOO.

----

CLASS counter DEFINITION

----

CLASS COUNTER DEFINITION.

PUBLIC SECTION.

METHODS INCREMENT.

PRIVATE SECTION.

DATA COUNT TYPE I.

ENDCLASS. "counter DEFINITION

----

CLASS counter IMPLEMENTATION

----

CLASS COUNTER IMPLEMENTATION.

METHOD INCREMENT.

COUNT = COUNT + 1.

WRITE:/ 'The Count is:', COUNT.

ENDMETHOD. "increment

ENDCLASS. "counter IMPLEMENTATION

DATA COUNT TYPE REF TO COUNTER.

START-OF-SELECTION.

CREATE OBJECT COUNT.

DO 5 TIMES.

CALL METHOD COUNT->INCREMENT.

ENDDO.

Regards,

Ramki.