Object Oriented ABAP

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Abstraction: Everything is visualized in terms of classes and objects. Encapsulation The wrapping up of data and methods into a single unit (called class) is known as Encapsulation. The data is not accessible to the outside world only those methods, which are wrapped in the class, can access it. Polymorphism: Methods of same name behave differently in different classes. Identical (identically-named) methods behave differently in different classes. <strong>Object</strong>-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.
<strong>Object</strong> oriented programming (OOP) explained with an example Create a class that keeps track of a bank account balance. Then write a program to use this class. Steps involved: Run the class builder utility (SE24). Create a class called ZACCOUNTxx, where xx is the last two digits of your logon ID. Declare a PRIVATE attribute BALANCE of type DMBTR to store the account balance. Create the following PUBLIC methods: o SET_BALANCE (Sets the balance to a new value) IMPORTING NEW_BALANCE TYPE DMBTR o DEPOSIT (Adds a deposit amount to the balance and returns the new balance) IMPORTING AMOUNT TYPE DMBTR RETURNING NEW_BALANCE TYPE DMBTR o WITHDRAW (Subtracts a deposit amount from the balance and returns the new balance.) IMPORTING AMOUNT TYPE DMBTR RETURNING NEW_BALANCE TYPE DMBTR EXCEPTIONS INSUFFICIENT_FUNDS Activate all elements of your class. Write a program called Z_USE_ACCOUNT_xx, where xx is the last two digits of your logon ID. This program should do the following: o Instantiate an instance of the Account class. o Set the account balance to some initial value. o Make several deposits and withdrawals, printing the new balance each time. Do not allow the balance to become less than zero. (Use the exception to detect this.) Test and debug your program. "Extra Credit": If you have extra time, try any of the following: Replace the SET_BALANCE method with a constructor. Pass the opening balance when you instantiate the account object. Create a static attribute and methods to set and get the name of the bank that holds the accounts. Step-by-step approach with screen-shots Go to SE24 (Class builder) Type in ZACCOUNTAA as the name of the class and press Create.
Page 1 and 2: Object Oriented ABAP From SAP Techn
Page 3 and 4: combines the character to the respe
Page 5 and 6: Data declared in public section can
Page 7 and 8: Single Inheriting: Acquiring the pr
Page 9: Multiple Inheritance is not support
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
Page 53 and 54: Press F5
Page 55 and 56: The values are changed. Press F5. T
Page 57 and 58: POLYMORPHISM:- Working on Polymorph
Page 59 and 60: 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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Object Oriented ABAP

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