Object Oriented Abap

Object Oriented ABAP

Why ABAP Objects ? • The idea behind the inception of this concept in 1992 was encapsulate SAP functionality with object oriented interfaces for BAPIs’. • They now provide additional OO development and execution functionality

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Features of Object Orientation • Information-Hiding ( Through the sections of the class such as Public,Protected and Private ) • Encapsulation • Inheritance ( Deriving additional attributes from a base class) • Abstraction (Interfaces) 3

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Elements Of ABAP Objects

• Classes – Templates for the objects, no memory. • Interfaces – Includes definition but no implementation • Objects – Instance of a class

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Classes • Classes are templates for objects • They have the following components Attributes (Static and Instance ) Methods ( Static and Instance ) Events ( GUI trigger )

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Attributes • Attributes are data fields in a class. They can have any ABAP data type. The content of an attribute determines the status of an object. • Attributes can be of two types. Instance attributes. Static Attributes 6

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Methods • Methods are internal procedure in classes. They can access all attributes of their class and can thus change the status of an object. • They could be compared to the subroutine in normal ABAP

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Methods • Again Methods are of two type Static Methods Instance Methods • Special Method : Constructor

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Events • Events enable objects or classes to trigger event handler methods in other objects or classes.

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Objects and Interfaces • Objects are instance of classes. You can create any number of objects(instances) for a class. Each one has a unique identity and its own attributes. • An Interface is a mechanism of implementing Abstraction and Polymorphism – Implementing the same class in two different ways

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Inheritance • Inheritance allows you to define classes by deriving them from existing classes. The new class adopts or inherits all components of the existing class. The existing class is called a super class of the new class. • A class can have any number of direct subclasses, but only one super class. ABAP Objects thus uses single inheritance. 11

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THANK YOU

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