Abap Oo Basics

8/11/2019 Abap Oo Basics

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BBS 2:

ABAP OO Basics


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ABAP OO Basics

An object is a self-contained entity having a state, a behavior, and an identity.


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ABAP OO Basics

THE MINDSET


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Classical ABAP: Declaration

Internal Table Declaration:

TYPES: BEGIN OF ty_out,num TYPE i,

END OF ty_out.

TYPES: ty_tt_out TYPE STANDARD TABLE OF ty_out,ty_ts_out TYPE SORTED TABLE OF ty_out,ty_th_out TYPE HASHED TABLE OF ty_out.

DATA: i_out TYPE ty_tt_out,is_out TYPE ty_ts_out,ih_out TYPE ty_th_out.


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Classical ABAP: Modularization

For maintainability and reusability There should be NO direct access to global

variables, internal tables, and work areas

directly Subroutine interface parameters:

USING

CHANGING


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Classical ABAP: Function Modules Are processed blocks with a defined

interface

transparent, separate, independent Have source codes that come between

the ABAP stmts: FUNCTION ENDFUNCTION.

Belong to FUNCTION GROUPS Are called using the ABAP statement:

CALL FUNCTION .


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Classical ABAP: Examples

Function Module Geeky Example #1

TABLES are not used


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Object Templates: Classes

InstancesInstances

Class Flight Class Hotel


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ABAP OO: Classes

Class Components: ATTRIBUTES

define the internal state of an object store an objects properties which can be public,

private, or protected

METHODS

the objects means of performing operations have an interface similar to function modules


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ABAP OO: Classes{DATA | CLASS-DATA} attr TYPE type

[ VALUE val ][ READ-ONLY ][ VIRTUAL [ SET-METHOD set-method ][ GET-METHOD get-method ] ]``.

CONSTANTS const TYPE type VALUE val.

{METHODS | CLASS-METHODS} method

[ IMPORTING ] [ EXPORTING ] [ CHANGING ] [ EXCEPTIONS ] [ RETURNING result TYPE t ].


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ABAP OO: ClassesCLASS DEFINITION.

* INHERITING FROM -- available in a later 4.0 version

PUBLIC SECTION. definition of components visible outside the class

PROTECTED SECTION.

definition of components only visible to subclasses ofthis class.

PRIVATE SECTION. definition of components only visible within the class

ENDCLASS.

CLASS IMPLEMENTATION. method implementations

ENDCLASS.


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ABAP OO: Example

LOCAL Class version of Geeky Example #1

GLOBAL Class version of Geeky Example #1


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ABAP OO: Example

Modularized Geeky Example #2

Retrieve material numbers from table MSEG andthen display these material numbers and theircorresponding descriptions. Includevalidations on the material and plant.


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ABAP OO: Definitions Constructor

Instance constructors - executed every time an object(instance) is created with the CREATE OBJECT statement

Class constructors - executed exactly once before youfirst access a class

Interfaces are implemented in addition to, and independently of

classes will only have a declaration part are listed in the definition part of the class, and must

always be in the PUBLIC SECTION


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ABAP OO: Definitions Events

Model state changes for an object Are triggered with the RAISE EVENT statement which

would call all event handlers that have been registeredfor this event using the SET HANDLER statement

Event Handlers Methods to handle events raised by other objects


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ABAP OO: Definitions Inheritance

an existing class is used to derive a new class (childclass).

the new class contains the attributes of the parent classplus the new attributes and methods added to it.

the child class derives all the attributes and methodsdeclared in parent class as PUBLIC.

the child class cannot inherit private members.

the protected members in parent class are derived inchild class but their visibility changes to private.


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Brown Bag Sessions Schedule29Jun: Basic Optimization Techniques

12Jul : ABAP OO Basics

19Jul : Webdynpro for ABAP Basics26Jul : Possible Topics:

Basic Optimization Techniques II

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