topic Re: ABAP-oop in Application Development and Automation Discussions

ABAP-oop

Former Member — Mon, 19 Jun 2006 10:39:16 GMT

what are object oreiented concept in abap?explain each one any body can help me?

Re: ABAP-oop

Former Member — Mon, 19 Jun 2006 10:43:01 GMT

Take a look here

http://help.sap.com/saphelp_nw04/helpdata/en/ce/b518b6513611d194a50000e8353423/content.htm

Regards,

Ravi

Re: ABAP-oop

Former Member — Mon, 19 Jun 2006 10:44:10 GMT

Hi Vijay,

Go through these documents also.

http://esnips.com/doc/5c65b0dd-eddf-4512-8e32-ecd26735f0f2/prefinalppt.ppt

http://esnips.com/doc/2c76dc57-e74a-4539-a20e-29383317e804/OO-abap.pdf

http://esnips.com/doc/0ef39d4b-586a-4637-abbb-e4f69d2d9307/SAP-CONTROLS-WORKSHOP.pdf

Regards,

SP.

Re: ABAP-oop

Former Member — Mon, 19 Jun 2006 10:44:31 GMT

search in google,help.sap.com,sdn threads...

Re: ABAP-oop

Former Member — Mon, 19 Jun 2006 10:46:31 GMT

Hi,

send me ur email id ,i will send u good doc on this.

rgds,

latheesh

Re: ABAP-oop

Former Member — Mon, 19 Jun 2006 10:46:36 GMT

Object orientation (OO), or to be more precise, object-oriented programming, is a problem-solving method in which the software solution reflects objects in the real world.

A comprehensive introduction to object orientation as a whole would go far beyond the limits of this introduction to ABAP Objects. This documentation introduces a selection of terms that are used universally in object orientation and also occur in ABAP Objects. In subsequent sections, it goes on to discuss in more detail how these terms are used in ABAP Objects. The end of this section contains a list of further reading, with a selection of titles about object orientation.

Objects

An object is a section of source code that contains data and provides services. The data forms the attributes of the object. The services are known as methods (also known as operations or functions). Typically, methods operate on private data (the attributes, or state of the object), which is only visible to the methods of the object. Thus the attributes of an object cannot be changed directly by the user, but only by the methods of the object. This guarantees the internal consistency of the object.

Classes

Classes describe objects. From a technical point of view, objects are runtime instances of a class. In theory, you can create any number of objects based on a single class. Each instance (object) of a class has a unique identity and its own set of values for its attributes.

Object References

In a program, you identify and address objects using unique object references. Object references allow you to access the attributes and methods of an object.

In object-oriented programming, objects usually have the following properties:

Encapsulation

Objects restrict the visibility of their resources (attributes and methods) to other users. Every object has an interface, which determines how other objects can interact with it. The implementation of the object is encapsulated, that is, invisible outside the object itself.

Polymorphism

Identical (identically-named) methods behave differently in different classes. Object-oriented programming contains constructions called interfaces. They enable you to address methods with the same name in different objects. Although the form of address is always the same, the implementation of the method is specific to a particular class.

Inheritance

You can use an existing class to derive a new class. Derived classes inherit the data and methods of the superclass. However, they can overwrite existing methods, and also add new ones.

Uses of Object Orientation

Below are some of the advantages of object-oriented programming:

Complex software systems become easier to understand, since object-oriented structuring provides a closer representation of reality than other programming techniques.

In a well-designed object-oriented system, it should be possible to implement changes at class level, without having to make alterations at other points in the system. This reduces the overall amount of maintenance required.

Through polymorphism and inheritance, object-oriented programming allows you to reuse individual components.

In an object-oriented system, the amount of work involved in revising and maintaining the system is reduced, since many problems can be detected and corrected in the design phase.

Achieving these goals requires:

Object-oriented programming languages

Object-oriented programming techniques do not necessarily depend on object-oriented programming languages. However, the efficiency of object-oriented programming depends directly on how object-oriented language techniques are implemented in the system kernel.

Object-oriented tools

Object-oriented tools allow you to create object-oriented programs in object-oriented languages. They allow you to model and store development objects and the relationships between them.

Object-oriented modeling

The object-orientation modeling of a software system is the most important, most time-consuming, and most difficult requirement for attaining the above goals. Object-oriented design involves more than just object-oriented programming, and provides logical advantages that are independent of the actual implementation.

This section of the ABAP User’s Guide provides an overview of the object-oriented extension of the ABAP language. We have used simple examples to demonstrate how to use the new features. However, these are not intended to be a model for object-oriented design. More detailed information about each of the ABAP Objects statements is contained in the keyword documentation in the ABAP Editor.

Re: ABAP-oop

Former Member — Mon, 19 Jun 2006 10:47:22 GMT

Hi Vijay,

Go through all these documets.

Check this for basic concepts of OOPS

https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/abap/abap code samples/abap objects/abap code sample to learn basic concept of object-oriented programming.doc

https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/abap/abap code samples/alv grid/abap code sample to display data in alv grid using object oriented programming.doc

Regards,

Mukesh Kumar

Re: ABAP-oop

Former Member — Mon, 19 Jun 2006 10:55:10 GMT

GOOD

Public attributes

Public attributes are defined in the PUBLIC section and can be viewed and changed from outside the class. There is direct access to public attributes. As a general rule, as few public attributes should be defined as possible.

PUBLIC SECTION.

DATA: Counter type i.

Private attributes

Private attributes are defined in the PRIVATE section. The can only be viewes and changed from within the class. There is no direct access from outside the class.

PRIVATE SECTION.

DATA: name(25) TYPE c,

planetype LIKE saplane-planetyp,

Instance attributes

There exist one instance attribute for each instance of the class, thus they exist seperately for each object. Instance attributes are declared with the DATA keyword.

Static attributes

Static attributes exist only once for each class. The data are the same for all instances of the class, and can be used e.g. for instance counters. Static attributes are defined with the keyword CLASS-DATA.

PRIVATE SECTION.

CLASS-DATA: counter type i,

Public methods

Can called from outside the class

PUBLIC SECTION.

METHODS: set_attributes IMPORTING p_name(25) TYPE c,

p_planetype LIKE saplane-planetyp,

Private methods

Can only be called from inside the class. They are placed in the PRIVATE section of the class.

Constructor method

Implicitly, each class has an instance constructor method with the reserved name constructor and a static constructor method with the reserved name class_constructor.

The instance constructor is executed each time you create an object (instance) with the CREATE OBJECT statement, while the class constructor is executed exactly once before you first access a class.

The constructors are always present. However, to implement a constructor you must declare it explicitly with the METHODS or CLASS-METHODS statements. An instance constructor can have IMPORTING parameters and exceptions. You must pass all non-optional parameters when creating an object. Static constructors have no parameters.

Static constructor

The static constructor is always called CLASS_CONSTRUCTER, and is called autmatically before the clas is first accessed, that is before any of the following actions are executed:

Creating an instance using CREATE_OBJECT

Adressing a static attribute using <classname>-><attrbute>

Calling a ststic attribute using CALL METHOD

Registering a static event handler

Registering an evetm handler method for a static event

The static constructor cannot be called explicitly.

Protected components

When we are talking subclassing and enheritance there is one more component than Public and Private, the Protected component. Protected components can be used by the superclass and all of the subclasses. Note that Subclasses cannot access Private components.

Polymorphism

Polymorphism: When the same method is implemented differently in different classes. This can be done using enheritance, by redefining a method from the superclass in subclasses and implement it differently.

THANKS

MRUTYUN

Re: ABAP-oop

Former Member — Mon, 21 Aug 2006 06:31:09 GMT

Hi Latheesh,

Thanks for you reference.

My mail id is vincent_as2004@yahoo.com

Regards,

Re: ABAP-oop

Former Member — Mon, 21 Aug 2006 06:39:51 GMT

Hi Vijay,

Have a look at these good links for OO ABAP-

http://www.sapgenie.com/abap/OO/

http://www.sapgenie.com/abap/OO/index.htm

http://help.sap.com/saphelp_nw04/helpdata/en/c3/225b5654f411d194a60000e8353423/content.htm

http://www.esnips.com/doc/375fff1b-5a62-444d-8ec1-55508c308b17/prefinalppt.ppt

http://www.esnips.com/doc/2c76dc57-e74a-4539-a20e-29383317e804/OO-abap.pdf

http://www.esnips.com/doc/5c65b0dd-eddf-4512-8e32-ecd26735f0f2/prefinalppt.ppt

http://www.allsaplinks.com/

http://www.sap-img.com/

http://www.sapgenie.com/

http://help.sap.com

http://www.sapgenie.com/abap/OO/

http://www.sapgenie.com.

http://www.sapgenie.com/abap/OO/index.htm

http://www.sapgenie.com/abap/controls/index.htm

http://www.esnips.com/doc/2c76dc57-e74a-4539-a20e-29383317e804/OO-abap.pdf

http://www.esnips.com/doc/0ef39d4b-586a-4637-abbb-e4f69d2d9307/SAP-CONTROLS-WORKSHOP.pdf

http://www.sapgenie.com/abap/OO/index.htm

http://help.sap.com/saphelp_erp2005/helpdata/en/ce/b518b6513611d194a50000e8353423/frameset.htm

http://www.sapgenie.com/abap/OO/

Please Reward Points & Mark Helpful Answers

To mark Helpful Answers ;click radio Button next to the post.

RadioButtons

o Helpful Answer

o Very helpful Answer

o Problem Solved.

Click any of the above button next to the post; as per the anwers

To close the thread; Click Probelm solved Radio Button next to the post , which u feel is best possible answers

Regards,

Tanuja.

Re: ABAP-oop

uwe_schieferstein — Mon, 21 Aug 2006 10:53:07 GMT

Hello Vijay

OO-Concepts consist of two main parts:

OO-analysis and OO-design.

BAdIs are a very good example to exemplify one of the OO-concepts. BAdI are user-exits that are based on interfaces. You implement BAdIs in order to adjust a SAP standard process to your customer-specific needs.

An interface is simply a "contract" having "empty" (i.e. without coding) methods that define what (but not how) you can modify of the standard process (e.g. you could have a CHECK_ORDER method where you could do additional checks on an order).

However, the BAdI does not contain any information about the concrete modification because only you can know this.

If you have to adjust a standard process where BAdIs are available you implement the BAdI, that is you create an ABAP class implementing the BAdI interface. In the class you put your concrete coding into method ORDER_CHECK.

Regards

Uwe

Re: ABAP-oop

pradiptakumar_mishra — Mon, 21 Aug 2006 11:10:06 GMT

Dear Latheesh,

If possible please send me the documents also. The id pradipta.mishra@gmail.com.

Thanks.

Pradipta k Mishra

Re: ABAP-oop

Former Member — Mon, 21 Aug 2006 11:35:25 GMT

Hi,

I have sent a ZIP file to your mail id with ABAP OBJECTS course material,It gives a complete idea of ABAP OBJECTS,

I hope you find it very helpful and reward points for the same.

Even check out the demo programs in ABAPDOCU

Regards,

Sowjanya

Message was edited by: sowjanya suggula