Object Oriented ABAP

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Understanding the concepts of Object Oriented Programming What is Object Orientation? In the past, information systems used to be defined primarily by their functionality: Data and functions were kept separate and linked together by means of input and output relations. The object-oriented approach, however, focuses on objects that represent abstract or concrete things of the real world. These objects are first defined by their character and their properties, which are represented by their internal structure and their attributes (data). The behavior of these objects is described by methods (functionality). Comparison between Procedural and Object Oriented Programming Features Procedure Oriented approach Object Oriented approach Emphasis Emphasis on tasks Emphasis on things that does those tasks. Modularization Programs are divided into smaller programs known as functions Data security Most of the functions share global data Extensibility Relatively more time consuming to modify for extending existing functionality. Programs are organized into classes and objects and the functionalities are embedded into methods of a class. Object Oriented Approach - key features Data can be hidden and cannot be accessed by external sources. New data and functions can be easily added whenever necessary 1. Better Programming Structure. 2. Real world entity can be modeled very well. 3. Stress on data security and access. 4. Reduction in code redundancy. 5. Data encapsulation and abstraction. What are Objects and Classes? 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). They form a capsule which
combines the character to the respective behavior. Objects should enable programmers to map a real problem and its proposed software solution on a one-toone basis. 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. Local and Global Classes As mentioned earlier a class is an abstract description of an object. Classes in ABAP Objects can be declared either globally or locally. Global Class: Global classes and interfaces are defined in the Class Builder (Transaction SE24) in the ABAP Workbench. They are stored centrally in class pools in the class library in the R/3 Repository. All of the ABAP programs in an R/3 System can access the global classes Local Class: Local classes are define in an ABAP program (Transaction SE38) and can only be used in the program in which they are defined. Global Class Local Class Accessed By Any program Only the program where it is defined. Stored In In the Class Repository Only in the program where it is defined. Created By Created using transaction SE24 Created using SE38 Namespace Must begin with Y or Z Can begin with any character Local Classes Every class will have two sections. (1) Definition. (2) Implementation Definition: This section is used to declare the components of the classes such as attributes, methods, events .They are enclosed in the ABAP statements CLASS ... ENDCLASS. CLASS DEFINITION. ... ENDCLASS. Implementation: This section of a class contains the implementation of all methods of the class. The implementation part of a local class is a processing block. CLASS IMPLEMENTATION. ... ENDCLASS.
Page 1: Object Oriented ABAP From SAP Techn
Page 5 and 6: Data declared in public section can
Page 7 and 8: Single Inheriting: Acquiring the pr
Page 9 and 10: Multiple Inheritance is not support
Page 11 and 12: Object oriented programming (OOP) e
Page 13 and 14: For withdraw we define an exception
Page 15 and 16: Click SET_BALANCE. Write the NEW_BA
Page 17 and 18: selection-screen begin of block a.
Page 19 and 20: WRITE: / 'Number of employees is:',
Page 21 and 22: ENDMETHOD. METHOD display_no_of_emp
Page 23 and 24: * Object references o_bluecollar_em
Page 25 and 26: * Adds a new employee to the list o
Page 27 and 28: l_wage = monthly_salary - monthly_d
Page 29 and 30: Press Save button. Then we can view
Page 31 and 32: And double click on the method sele
Page 33 and 34: Provide the logic. Then save it, ch
Page 35 and 36: Working with the Keyword SUPER in o
Page 37 and 38: Save it. Then we can see the method
Page 39: *Create the object CREATE OBJECT OB
Page 42: WRITE:/ 'THIS IS MM1 METHOD IN SUPE
Page 45 and 46: SKIP 2. CALL METHOD OBJ->ANOTHER. S
Page 47 and 48: Then save it, check it, activate it
Page 49 and 50: *create the object START-OF-SELECTI
Page 51 and 52: Working with import, export and cha
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Press F5
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The values are changed. Press F5. T
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POLYMORPHISM:- Working on Polymorph
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Select display method then provide
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Select select _ method then press t
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Double click on the method then pro
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Go to TCode SE24. Enhancement of a
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Enter the Source code. Click on Sav
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Paste the Below Code. *&-----------
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4. How does it integrate? The Class
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10. Conventions for Components: Met
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The ZCL_TEST class now contains the
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An example to show how to define At
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The FIND_BY_LPOR method should alwa
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If we do not need the method in our
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21. BI_OBJECT~RELEASE Method: The s
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BOR objects Exceptions: Object is t
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Provide parameters also for this me
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Save & activate. Following screen a
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INTO TABLE IT_LFA1 WHERE LIFNR BETW
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The output is like this.
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Save it. Provide the method name. P
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Save it. Go to interface tab. Provi
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Provide the code. *&---------------
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IT_MARA TYPE Z_MARA, WA_MARA TYPE M
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Following pop-up appears: Enter you
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Create Transaction for local class
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transaction and execute it. In this
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Step: 3 -> Persistent Mapping or Ma
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To assign a class indicator, select
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I_OID = '30EA9E25999F0843BE6F7B8606
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Step: 2 -> Persistent Mapping or Ma
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Step: 3 -> Write a Program to creat
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delete_persistent importing im_sno
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Persistent Objects: Using GUID Obje
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Give the table name. For eg ZSTUDEN
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Add the remaining fields as well. S
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Here I am creating a new student. S
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sname, mark1, mark2. CATCH CX_OS_OB
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Step: 3 Create OO transaction. Go t
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Execute the transaction Z_TX Step:
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1.6 Inheritance In OO ABAP we use a
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METHOD xyz. write : / 'Child class
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2.3 Binding Check Table I have prep
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Introduction: Understanding "ABAP U
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Actual result - 24. Expected Result
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Executing Unit Tests: For program,
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Demo on "Narrow Casting" Definition
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Accessing methods using super class
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Abstract Classes and Methods in Obj
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Double click on the Method name "AR
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A successful message is displayed l
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Enter the Super class name as "Z_DE
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Write the code In between Method an
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Enter the number under V_NUM as "6"
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Enter the Description of the class
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Method meth * Local Data Declaratio
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Enter the Description of the class
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Pop-up window is displayed Go to "A
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A pop-up window is displayed, then
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The output will be displayed like b
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After execution (F8): Result:
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After execution (F8): Result:
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Enter the „Class name‟, „Clas
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Enter the „Description‟ for the
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Create a screen „0100‟ and a cu
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MODULE user_command_0100 INPUT. CAS
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internal_error = 3 parameter_error
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EXPORTING fields_table = locint_fie
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*&---------------------------------
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l_err_row TYPE i. TYPE-POOLS:sx. DA
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Doesn‟t allow the user to modify
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Event Handler Technique in Object o
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Output. Now select the method. And
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After that provide the logic in se3
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Dialog processing after COMMIT WORK
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The Event TRANANSACTION_FINISHED of
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