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    3.sap OOPS-Inhitence, Polymohrishm, Enchapsulation

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    anjali Anju
    Inheritance in SAP ABAP allows classes to inherit properties and behaviors from parent classes to promote code reusability. A subclass inherits from a superclass and can access public and protected members, but not private members. Encapsulation is achieved through access modifiers like public, private, protected, and interfaces that define behaviors without implementation. Polymorphism occurs in inheritance when methods are redefined through overloading with different parameters or overriding in a subclass with the same name and parameters.

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    3.sap OOPS-Inhitence, Polymohrishm, Enchapsulation

    Uploaded by

    anjali Anju
    21 views7 pages
    Inheritance in SAP ABAP allows classes to inherit properties and behaviors from parent classes to promote code reusability. A subclass inherits from a superclass and can access public and protected members, but not private members. Encapsulation is achieved through access modifiers like public, private, protected, and interfaces that define behaviors without implementation. Polymorphism occurs in inheritance when methods are redefined through overloading with different parameters or overriding in a subclass with the same name and parameters.

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    3.Sap OOPS-Inhitence, polymohrishm, enchapsulation

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    Inheritance in SAP ABAP allows classes to inherit properties and behaviors from parent classes to promote code reusability. A subclass inherits from a superclass and can access public and protected members, but not private members. Encapsulation is achieved through access modifiers like public, private, protected, and interfaces that define behaviors without implementation. Polymorphism occurs in inheritance when methods are redefined through overloading with different parameters or overriding in a subclass with the same name and parameters.

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    © All Rights Reserved
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    21 views7 pages

    3.sap OOPS-Inhitence, Polymohrishm, Enchapsulation

    Uploaded by

    anjali Anju
    Inheritance in SAP ABAP allows classes to inherit properties and behaviors from parent classes to promote code reusability. A subclass inherits from a superclass and can access public and protected members, but not private members. Encapsulation is achieved through access modifiers like public, private, protected, and interfaces that define behaviors without implementation. Polymorphism occurs in inheritance when methods are redefined through overloading with different parameters or overriding in a subclass with the same name and parameters.

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    of 7

    SAP ABAP OOPS – Inheritance, Encapsulation, Polymorphism

    Inheritance in SAP ABAP

    · Inheritance means to derive code functionality from one class to another

    · It means defining a class in terms of another (parent) class

    · This feature of object orientation promotes reusability of classes

    · We can use inheritance while writing a class with which to derive a parent class, by mentioning
    the name of parent class in the definition of derived class

    · Hence, the class that is inherited is called parent or base class or super class, and the class
    inheriting the base class is the child class or derived class or subclass

    · Through inheritance, an object from derived class can obtain characteristics of objects from base
    class

    · The keyword to use for inheritance is ‘INHERITING FROM’, just beside the class definition

    SYNTAX FOR DEFINING CLASS:

    CLASS <subclass_name> DEFINITION INHERITING FROM <superclass_name>

    Report name:ZDATAFLAIR_INHERITANCE
    Output:

    ABAP Access Control and Inheritance

    · We know that a class can be defined as public, private, protected

    · So when a subclass inherits a superclass, there are certain rules that govern how the class can
    access objects and data of superclass
    The following table shows whether a derived class has access to base class, based on whether the base
    class is defined as public/protected/private:

    ACCESS SAME CLASS DERIVED CLASS OUTSIDE (NON-DERIVED CLASS)

    PUBLIC Yes Yes Available

    PRIVATE Yes Yes No

    PROTECTED Yes No No

    The above table is explained as follows –

    1. Public Inheritance:

    · Public data and members of superclass become public data and members of subclass

    · Protected members of superclass become protected members of subclass

    · Private members of superclass cannot be accessed by subclass

    2. Private Inheritance:

    · Public members of superclass become private members of subclass

    · Protected members of superclass become private members of subclass

    · Private members of superclass cannot be accessed by subclass

    3. Protected Inheritance:

    · Public members of superclass become protected members of subclass

    · Protected members of superclass become protected members of subclass

    · Private members of superclass cannot be accessed by subclass

    Redefining Methods in Sub Class in SAP ABAP

    · We can redefine methods of superclass in subclass

    · We usually do this so that we can have subclass-specific methods

    · However, we must keep the section of redefinition of the method the same as the parent
    method

    · We only need to use the name of the inherited method and can access its components using
    ‘super’ reference
    Encapsulation in ABAP

    · Encapsulation in object orientation means wrapping data and functions together

    · This hides the data and function from the outside world, thus promoting data hiding

    · Data hiding means obstructing the view of private data and functions from unwanted
    third parties, and data abstraction means showing users only what they need to see

    · In ABAP, we can do encapsulation via access methods – public, private, protected.

    · We can also perform encapsulation via interfaces (which are similar to classes, the only
    difference is that we do not implement anything in an interface, it has to be done via
    class inheriting the interface, as shown in example below)

    Report name: ZDATAFLAIR_ENHANCEMENT

    Output:
    Polymorphism in SAP ABAP
    · It means using one thing for different operations

    · It occurs usually in inheritance – for e.g. redefining methods which we saw under the
    concept of inheritance

    · Polymorphism means redefining methods to either overload them or override them

    · Overloading methods means when we use the same method name but use different
    parameters

    · Overriding methods means when we use the same method name and parameters, but
    the two methods are related via inheritance relationship

    Report name:ZDATAFLAIR_POLYMIRPHISM
    Output:

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