Dynamic Type Binding in SAP ABAP
Dynamic type binding is a concept related to polymorphism in SAP ABAP, specifically in the context of method calls. It involves determining the actual type of an object at runtime and dynamically binding the appropriate method based on that type. This is crucial for achieving runtime polymorphism.
In SAP ABAP, when you have a reference variable of a superclass type pointing to an object of a subclass, the system determines the actual type of the object at runtime. Dynamic type binding allows the system to invoke the correct method based on the actual type of the object being referred to.
CLASS superclass DEFINITION.
PUBLIC SECTION.
METHODS display_data.
ENDCLASS.
CLASS subclass DEFINITION INHERITING FROM superclass.
PUBLIC SECTION.
METHODS display_data REDEFINITION.
ENDCLASS.
START-OF-SELECTION.
DATA obj TYPE REF TO superclass.
CREATE OBJECT obj TYPE subclass.
" Dynamic type binding
CALL METHOD obj->display_data( ).
Explanation:
- We have a superclass superclass with a method display_data.
- We have a subclass subclass that inherits from superclass and redefines the display_data method.
- We create an object obj of type subclass but assign it to a reference variable of type superclass.
When we call obj->display_data( ), dynamic type binding comes into play. The system recognizes that the actual type of the object referred to by obj is a subclass object. As a result, the overridden method in the subclass is invoked at runtime.
SAP ABAP | Polymorphism
Polymorphism in SAP ABAP is a core principle in Object-Oriented Programming (OOP) that enables different classes to be handled as instances of a shared class via a common interface. This allows developers to apply techniques in various ways while storing a constant user interface. In SAP ABAP, the integration of polymorphism is pivotal for augmenting code flexibility and ensuring ease of maintenance.
Table of Content
- What is Polymorphism in SAP ABAP?
- Types of Polymorphism in SAP ABAP:
- Abstract Class and Subclass in SAP ABAP
- Dynamic Type Binding in SAP ABAP
- Conclusion:
SAP ABAP | Polymorphism