What is narrow casting and wide casting in SAP ABAP?

What is narrow casting and wide casting in SAP ABAP?

Assigning/copying the instance of sub class to super class instance is called Narrowing Cast. Narrowing cast = Up cast 🙂 . Widening Cast: Assigning/coping the instance of super class to the sub class instance is called Widening Cast. This is the reverse of Narrowing cast.

What is polymorphism in ABAP?

The term polymorphism literally means ‘many forms’. That is, polymorphism occurs when there is a hierarchy of classes and they are related by inheritance. ABAP polymorphism means that a call to a method will cause a different method to be executed depending on the type of object that invokes the method.

What is Upcasting and Downcasting in ABAP?

subclass reference is not useful to call the methods of any of the classes. This convention is known as Downcasting. We can convert the subclass reference to a superclass reference without using the cast poeration compiler because it will internally take care of the casting. This is known as Upcasting.

What is wide casting?

It means copying an instance of subclass to an instance of the super class. It means copying an instance of the super class to an instance of sub class. Only inherited components of the subclass can be accessed.

What is the difference between class and interface in ABAP?

Classes, their instances/objects, and access to objects using reference variables forms the basics of ABAP Objects. A class represents a set of properties or methods that are common to all the objects of one type. Interface is used when similar classes have same method with the same name but different functionalities.

What is persistent class in ABAP?

The Persistence Service lets the ABAP programmer work with relational database data in an object-oriented way. These ORM tools enable you to construct classes with attributes, and then the framework will automatically generate the corresponding database tables in your database, and represent the data like objects.

What’s the difference between polymorphism and inheritance?

Inheritance is one in which a new class is created (derived class) that inherits the features from the already existing class(Base class). Whereas polymorphism is that which can be defined in multiple forms. Whereas it can be compiled-time polymorphism (overload) as well as run-time polymorphism (overriding).

What is the difference between narrowing casting and widening casting?

Widening conversions preserve the source value but can change its representation. A narrowing conversion changes a value to a data type that might not be able to hold some of the possible values.

What is Cx_sy_move_cast_error?

CX_SY_MOVE_CAST_ERROR is a standard SAP object class available within R/3 SAP systems depending on your version and release level. You can view/maintain the class details by entering its name into the relevant SAP transactions such as SE24, SE80 or even SE84.

What is narrow casting in Java?

The process of conversion of higher data type to lower data type is known as narrowing typecasting. It is not done automatically by Java but needs to be explicitly done by the programmer, which is why it is also called explicit typecasting.

What is narrowing cast in Java?

Assigning/copying the instance of sub class to super class instance is called Narrowing Cast. As shown in the figure, assigning sub class to super class is going up wards. From sub class (es) to super class while moving Up the path becomes narrow as shown in the left image. So I simply remember this. Narrowing cast = Up cast .

What is narrow casting with example?

When we assign the instance of the Subclass back to the instance of the Superclass, than it is called the “Narrow Casting”, because we are switching from a “More Specific view of an object” to “less specific view”. For example: we have a class a global class for ANIMAL. Now, we have inherited more specific class as LION from the ANIMAL.

What is the ABAP programming language?

ABAP is a programming language that runs in the SAP ABAP runtime environment, created and used by SAP for the development of application programs including:

What is the ABAP RAP model?

The ABAP RESTful Application Programming Model (in short RAP) defines the architecture for efficient end-to-end development of intrinsically SAP HANA-optimized OData services (such as Fiori apps). It supports the development of all types of Fiori applications as well as publishing Web APIs.