topic please help in Application Development and Automation Discussions

please help

laxman_sankhla3 — Thu, 12 Jul 2007 06:54:16 GMT

i need document for how to create class , method step by step .

and how to use that class and method.

thanks.

Re: please help

Former Member — Thu, 12 Jul 2007 06:56:35 GMT

Hi,

Check this link

http://help.sap.com/saphelp_nw04/helpdata/en/b3/f4b1406fecef0fe10000000a1550b0/content.htm

http://help.sap.com/saphelp_nw2004s/helpdata/en/c0/88885f720911d1b44d0000e8a52bed/content.htm

Thanks.

Re: please help

gopi_narendra — Thu, 12 Jul 2007 06:58:06 GMT

Check this

Dump of the program:-

REPORT  YSUBDEL LINE-SIZE 120.

 CLASS parentclass DEFINITION .
 PUBLIC SECTION.
  DATA : commondata(30) type c value 'Accessible to all'.
  METHODS : SHOWVAL.
 PROTECTED SECTION.
  DATA : protectdata(40) type c value 'Protected data'.
 private section.
 data : privatedata(30) type c value 'Private data'.
 ENDCLASS.

 CLASS parentclass IMPLEMENTATION.
 METHOD : SHOWVAL.
  write:/5 'All data from parentclass shown:-'.
  write:/ sy-uline.
  WRITE:/5 COMMONDATA,
        /5 PROTECTDATA,
        /5 PRIVATEDATA.
 endmethod.
endclass.

CLASS childclass DEFINITION INHERITING FROM parentclass.
 PUBLIC SECTION .
 METHODS : subval.
 ENDCLASS.

 CLASS childclass IMPLEMENTATION.
 method : subval.
  skip 1.
  write:/5 'Data of parent shown from child-'.
  write:/5 sy-uline.
  WRITE:/5 COMMONDATA,
        /5 PROTECTDATA.
  Commondata = 'Public data changed in subclass'.
  Protectdata = 'Protected data changed in subclass'.
  write:/5 sy-uline.
  WRITE:/5 COMMONDATA,
        /5 PROTECTDATA.
 endmethod.
endclass.

START-OF-SELECTION.
   DATA : parent type ref to parentclass ,
          child  type ref to childclass  .
   create object : parent ,
                   child  .
   call method : parent->showval ,
                 child->subval.
      skip 2.
  parent->commondata = ‘User changing public data’.
  write:/5 parent->commondata.

Regards

Gopi

Re: please help

Former Member — Thu, 12 Jul 2007 07:00:08 GMT

hi,

We can create class by using these simple steps.

class has declaration step, in this we can define call componets like

methods, attributes,evnts..

*local class creation

CLASS <class> DEFINITION.

METHOD <meth>. "for defining methods.

...

ENDMETHOD.

...

ENDCLASS.

class has implementation section, in this section we can provide implementations to all the definitions which are declared in class declaration section.

CLASS <class> IMPLEMENTATION.

...

ENDCLASS.

simple example;

CLASS C_COUNTER DEFINITION.

PUBLIC SECTION. " here declare public components

METHODS: SET_COUNTER IMPORTING VALUE(SET_VALUE) TYPE I,

INCREMENT_COUNTER,

GET_COUNTER EXPORTING VALUE(GET_VALUE) TYPE I.

PRIVATE SECTION. "here declare local components

DATA COUNT TYPE I.

ENDCLASS.

CLASS C_COUNTER IMPLEMENTATION.

METHOD SET_COUNTER. " method implemetation

COUNT = SET_VALUE.

ENDMETHOD.

METHOD INCREMENT_COUNTER.

ADD 1 TO COUNT.

ENDMETHOD.

METHOD GET_COUNTER.

GET_VALUE = COUNT.

ENDMETHOD.

ENDCLASS.

Follow these steps to declare object to class.

data: obj type ref to <name of the class>. "here refarence variable is created

CREATE OBJECT obj. "here object is created

*global class creation

we can create global class in CLASS BUILDER, for that one we work with SE24.

follow this link for class builder.

http://help.sap.com/saphelp_nw2004s/helpdata/en/ee/e440a670a111d1b44c0000e8a52bed/content.htm

follow this link for knowing types of classes and types of class components.

http://www.erpgenie.com/abap/OO/syntax.htm

http://help.sap.com/saphelp_nw04/helpdata/en/b3/f4b1406fecef0fe10000000a1550b0/content.htm

Reward points if helpful

Regards

Ashu

Re: please help

Former Member — Thu, 12 Jul 2007 07:01:14 GMT

Example 1

The class circle contains two functional static methods, circumference and area, which work with the constant pi.

CLASS circle DEFINITION.

PUBLIC SECTION.

CONSTANTS pi TYPE f

VALUE '3.14159265358979324'.

CLASS-METHODS: circumference IMPORTING r TYPE f

RETURNING value(c) TYPE f,

area IMPORTING r TYPE f

RETURNING value(a) TYPE f.

ENDCLASS.

CLASS circle IMPLEMENTATION.

METHOD circumference.

c = 2 * pi * r.

ENDMETHOD.

METHOD area.

a = pi * r ** 2.

ENDMETHOD.

ENDCLASS.

DATA: circ TYPE f,

area TYPE f,

radius TYPE f.

START-OF-SELECTION.

radius = '1.00'.

circ = circle=>circumference( radius ).

area = circle=>area( radius ).

Example 2

When a class is first accessed, the static constructor of this class uses the system field sy-repid to set the static attribute access_program<> for the name of the program of an internal session that uses the class first.

CLASS some_class DEFINITION.

PUBLIC SECTION.

CLASS-METHODS class_constructor.

PRIVATE SECTION.

CLASS-DATA access_program TYPE sy-repid.

ENDCLASS.

CLASS some_class IMPLEMENTATION.

METHOD class_constructor.

access_program = sy-repid.

ENDMETHOD.

ENDCLASS.

Example 3

In the class dialog_box, a static event handler close_box id defined for the event, which is triggered when the user chooses to close a dialog box of the Control Framework (CFW).

CLASS dialog_box DEFINITION.

PUBLIC SECTION.

METHODS constructor.

...

PRIVATE SECTION.

CLASS-DATA open_boxes TYPE i.

CLASS-METHODS close_box

FOR EVENT close OF cl_gui_dialogbox_container

IMPORTING sender.

...

ENDCLASS.

CLASS dialog_box IMPLEMENTATION.

METHOD constructor.

... " create a dialogbox

open_boxes = open_boxes + 1.

ENDMETHOD.

METHOD close_box

... " close the dialogbox referred by sender

open_boxes = open_boxes - 1.

ENDMETHOD.

ENDCLASS.

Regards,

Pavan