In the hierarchy of classes, which statement is true about the class lcl_plane and its subclasses lcl_passenger and lcl_cargo?

In the hierarchy of classes, which statement is true about the class lcl_plane and its subclasses lcl_passenger and lcl_cargo?

• A. You can assign an instance of lcl_passenger to a reference variable with type lcl_plane
• B. You can assign an instance of lcl_passenger to a reference variable with type lcl_cargo
• C. You can only assign an instance of lcl_passenger to a reference variable with type lcl_passenger
• D. You cannot assign any instances of subclasses to the parent class reference variable

Answer: (A)

In object-oriented programming, particularly in the context of ABAP, the concept of inheritance allows a subclass to be treated as an instance of its parent class. This particularly applies to the scenario involving the class `lcl_plane` and its subclasses `lcl_passenger` and `lcl_cargo`. When an instance of `lcl_passenger` is created, it inherits the properties and methods of `lcl_plane` since `lcl_passenger` is a subclass of `lcl_plane`. Consequently, because of this inheritance, any instance of `lcl_passenger` can indeed be treated as an instance of `lcl_plane`. This is a fundamental feature in object-oriented programming known as polymorphism, which allows you to use a subclass instance wherever a parent class instance is expected. This flexibility is essential in design as it enables developers to write more general code that can operate on the class as a whole (the parent class) rather than specifics of the subclasses. It promotes code reusability and efficiency. To summarize the nature of the other statements: - The second statement about assigning an instance of `lcl_passenger` to a reference variable of type `lcl_cargo` is not valid, as `l

In object-oriented programming, particularly in the context of ABAP, the concept of inheritance allows a subclass to be treated as an instance of its parent class. This particularly applies to the scenario involving the class lcl_plane and its subclasses lcl_passenger and lcl_cargo.

When an instance of lcl_passenger is created, it inherits the properties and methods of lcl_plane since lcl_passenger is a subclass of lcl_plane. Consequently, because of this inheritance, any instance of lcl_passenger can indeed be treated as an instance of lcl_plane. This is a fundamental feature in object-oriented programming known as polymorphism, which allows you to use a subclass instance wherever a parent class instance is expected.

This flexibility is essential in design as it enables developers to write more general code that can operate on the class as a whole (the parent class) rather than specifics of the subclasses. It promotes code reusability and efficiency.

To summarize the nature of the other statements:

• The second statement about assigning an instance of lcl_passenger to a reference variable of type lcl_cargo is not valid, as `l