topic Regarding constructors in oops in Application Development and Automation Discussions

Regarding constructors in oops

spandana_babu — Tue, 13 May 2008 06:06:08 GMT

sap gurus

hw to view the constructors in class builder..& also tell hw to use construcotrs in oops abap

with example..

hw can i find out the parameters for the constructor in stanadard class.

Regards

Spanadna

Re: Regarding constructors in oops

amit_khare — Tue, 13 May 2008 06:15:54 GMT

check class in SE24.

Re: Regarding constructors in oops

Former Member — Tue, 13 May 2008 07:09:21 GMT

Hi Spandana,

You instantiate a class using the ABAP statement CREATE OBJECT. This calls the constructor for the instance. The constructor can contain parameters that you may have to supply with values.

there are two special methods which you call using CALL METHOD. These are called CONSTRUCTOR and CLASS _CONSTRUCTOR. They are automatically called when you create an object (Constructor) or when you first access the components of a class (CLASS _CONSTRUCTOR).

find the below links are helpful to understand the ABAP Objects.

[http://help.sap.com/erp2005_ehp_03/helpdata/EN/ce/b518b6513611d194a50000e8353423/frameset.htm|http://help.sap.com/erp2005_ehp_03/helpdata/EN/ce/b518b6513611d194a50000e8353423/frameset.htm]

Re: Regarding constructors in oops

matt — Tue, 13 May 2008 07:37:36 GMT


> hi
> 
> sap gurus
> 
>  hw to  view the constructors in  class builder..& also tell  hw  to use construcotrs in  oops abap 
> with  example..
> hw can i  find  out  the   parameters for the  constructor in   stanadard class.
> 
> 
> Regards
> 
> Spanadna

This should have been posted in the ABAP Objects section...

If you look at the class in SE24, you may see a method called "CONSTRUCTOR". If you set your cursor on the constructor, and click on the PARAMETERS button, you'll see the parameters. These are always input parameters. A constructor can have zero, one or many parameters. Some may be optional.

You can also tell the parameters of a constructor by using the Create object pattern (Pattern button in the ABAP editor, ABAP Objects Patterns, Create object ).

If you don't see a CONSTRUCTOR method in SE24, it means that the class does not have an explicit constructor. In this case, CREATE OBJECT still returns an object reference, but there's no code run in the class at creation, and there are no parameters.

matt

Re: Regarding constructors in oops

Former Member — Tue, 13 May 2008 09:50:18 GMT

hii..

first constructors are the 1st events tht are triggered in a class..there r 2 type of constructors..static and instance.

for eg in oops.

class cl1 definition.

public section.

methods: add,sub, constructor importing v1 type i v2 type i.

class-methods:class_constructor. -

> ths is static constructor.its only triggered once at the beginning of the object.

private section.

data:var1 type i,var 2 type i,result type i.

class-data: counter type i.----> static data to count the number of the static constructor occurrence.

methods:display.

endclass.

class 1 implementation.

method add. reasult = var1 + var2.

display().

endmethod.

method display.

write: 'reasult', result.

endmethod.

method constructor.

var1 = v1.

var2 = v2.

endmethod.

method class_constructor.

write: 'ths is static'.

endmethod.

*now the main prg...*_

data:ref1 type ref to cl1.

parameters: p1 type i,p2 type i.

data:result type i.

star-of-selection.

create object ref1 exporting v1=p1 v2=p2.

ref1->add().

hopefully i am able to expalin you with ths example....

plzz reward points if helpful...