Object Oriented ABAP

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Demo on "Narrow Casting" Definition: The assignment of a subclass instance to a reference variable of the type "reference to super class" is described as a narrowing cast, because you are switching from a more detailed view to a one with less detail. It is also called as up-casting. Use of narrowing casting: A user who is not interested in the finer points of cars, trucks, and busses (but only, for example, in the fuel consumption and tank gauge) does not need to know about them. This user only wants and needs to work with (references to) the lcl_vehicle(super class) class. However, in order to allow the user to work with cars, busses, or trucks, you generally need a narrowing cast. Principle of narrowing casting: 1. In narrowing casting the object which is created with reference to the sub class is assigned to the reference of type super class. 2. Using the super class reference it is possible to access the methods from the object which are only defined at the super class. 3. This access is also called as generic access as super class is normally called as general class. Example: Super class: vehicle (contains general methods)
Sub class: truck (contains more specific methods) Here method4 is the specific for the sub class and remaining methods are inherited from the super class. Now create the object with reference to the subclass. 1. Declare a variable with reference to the subclass. DATA: REF_TRUCK TYPE REF TO TRUCK. 2. Create object with this reference. CREATE OBJECT REF_TRUCK. Narrowing cast: 1. Declare a variable with reference to the super class. DATA: REF_VEHICLE TYPE REF TO VEHICLE. 2. Assign the object reference (REF_TRUCK) to REF_VEHICLE. REF_VEHICLE = REF_TRUCK.
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Object Oriented ABAP From SAP Techn
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combines the character to the respe
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Data declared in public section can
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Single Inheriting: Acquiring the pr
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Multiple Inheritance is not support
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Object oriented programming (OOP) e
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For withdraw we define an exception
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Click SET_BALANCE. Write the NEW_BA
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selection-screen begin of block a.
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WRITE: / 'Number of employees is:',
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ENDMETHOD. METHOD display_no_of_emp
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* Object references o_bluecollar_em
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* Adds a new employee to the list o
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l_wage = monthly_salary - monthly_d
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Press Save button. Then we can view
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And double click on the method sele
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Provide the logic. Then save it, ch
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Working with the Keyword SUPER in o
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Save it. Then we can see the method
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*Create the object CREATE OBJECT OB
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WRITE:/ 'THIS IS MM1 METHOD IN SUPE
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SKIP 2. CALL METHOD OBJ->ANOTHER. S
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Then save it, check it, activate it
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*create the object START-OF-SELECTI
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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
Page 98 and 99: Save it. Go to interface tab. Provi
Page 100 and 101: Provide the code. *&---------------
Page 102 and 103: IT_MARA TYPE Z_MARA, WA_MARA TYPE M
Page 104 and 105: Following pop-up appears: Enter you
Page 106 and 107: Create Transaction for local class
Page 108 and 109: transaction and execute it. In this
Page 110 and 111: Step: 3 -> Persistent Mapping or Ma
Page 112 and 113: To assign a class indicator, select
Page 114 and 115: I_OID = '30EA9E25999F0843BE6F7B8606
Page 116 and 117: Step: 2 -> Persistent Mapping or Ma
Page 118 and 119: Step: 3 -> Write a Program to creat
Page 120 and 121: delete_persistent importing im_sno
Page 122 and 123: Persistent Objects: Using GUID Obje
Page 124 and 125: Give the table name. For eg ZSTUDEN
Page 126 and 127: Add the remaining fields as well. S
Page 128 and 129: Here I am creating a new student. S
Page 130 and 131: sname, mark1, mark2. CATCH CX_OS_OB
Page 132 and 133: Step: 3 Create OO transaction. Go t
Page 134 and 135: Execute the transaction Z_TX Step:
Page 136 and 137: 1.6 Inheritance In OO ABAP we use a
Page 138 and 139: METHOD xyz. write : / 'Child class
Page 140 and 141: 2.3 Binding Check Table I have prep
Page 142 and 143: Introduction: Understanding "ABAP U
Page 144 and 145: Actual result - 24. Expected Result
Page 146 and 147: Executing Unit Tests: For program,
Page 150: Accessing methods using super class
Page 154 and 155: Abstract Classes and Methods in Obj
Page 156 and 157: Double click on the Method name "AR
Page 158 and 159: A successful message is displayed l
Page 160 and 161: Enter the Super class name as "Z_DE
Page 162 and 163: Write the code In between Method an
Page 164: Enter the number under V_NUM as "6"
Page 167 and 168: Enter the Description of the class
Page 169 and 170: Method meth * Local Data Declaratio
Page 171 and 172: Enter the Description of the class
Page 173 and 174: Pop-up window is displayed Go to "A
Page 175 and 176: A pop-up window is displayed, then
Page 177 and 178: The output will be displayed like b
Page 180 and 181: After execution (F8): Result:
Page 183 and 184: After execution (F8): Result:
Page 185 and 186: Enter the „Class name‟, „Clas
Page 187 and 188: Enter the „Description‟ for the
Page 189 and 190: Create a screen „0100‟ and a cu
Page 191 and 192: MODULE user_command_0100 INPUT. CAS
Page 193 and 194: internal_error = 3 parameter_error
Page 195 and 196: EXPORTING fields_table = locint_fie
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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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