A final class is declared using the keyword FINAL in its definition. It’s used when you want to prevent further inheritance of the class, ensuring its behavior cannot be modified through subclassing. Why Use a Final Class?
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Instance Members (Methods & Data) Belong to individual objects (instances). Created using DATA and METHODS. Each object has its own copy of the data. Accessed using the object reference: lo_obj->method_name. Useful when each object should maintain its own state. Destroyed when the object goes out of ...
1. Single Inheritance (Supported in ABAP) Definition: One subclass inherits from one superclass. Use: Most common form of inheritance. CLASS parent_class DEFINITION. PUBLIC SECTION. METHODS: display.ENDCLASS.CLASS parent_class IMPLEMENTATION. METHOD display. WRITE: 'Parent class method'. ENDMETHOD.ENDCLASS.CLASS child_class DEFINITION INHERITING FROM parent_class.ENDCLASS.CLASS child_class IMPLEMENTATION.ENDCLASS.
Method overriding allows a subclass to provide a new implementation of a method that is already defined in the superclass. The method in the subclass must use the REDEFINITION keyword. When to use it: When a general method in a ...
*--Check BOL is assigned to TU or not, if not raise error message DATA lo_tu_query TYPE REF TO /scwm/cl_sr_tu_query. DATA lo_log ...
While ABAP classes can’t inherit from multiple classes, they can implement multiple interfaces, achieving interface-based multiple inheritance. INTERFACE if1. METHODS: method1. ENDINTERFACE. INTERFACE if2. METHODS: method2. ENDINTERFACE. CLASS my_class DEFINITION. PUBLIC SECTION. INTERFACES: if1, if2. ENDCLASS. CLASS my_class IMPLEMENTATION. METHOD if1~method1. WRITE: 'Method1 from IF1'. ENDMETHOD. METHOD if2~method2. WRITE: 'Method2 from IF2'. ENDMETHOD. ENDCLASS.
An interface in ABAP defines a contract that any implementing class must follow. It contains only declarations of: Methods (without implementation) Constants Types Attributes Interfaces do not contain implementation. Any class that implements an interface must provide the logic for all its methods. Feature Description No implementation Only method ...
Inheritance allows one class to reuse the code from another class. In SAP ABAP, this helps in building modular, reusable, and maintainable programs. Use of Inheritance in SAP Purpose
Access specifiers define the visibility and accessibility of class components such as attributes, methods, and events. They help in implementing encapsulation, a core concept of object-oriented programming (OOP), by controlling which parts of a class can be accessed from outside ...
An abstract class is a class that cannot be instantiated directly. It serves as a blueprint for other classes. Abstract classes typically include: Abstract methods, which are declared but not implemented. Concrete methods, which can be implemented and inherited. Feature Description Not instantiable Cannot use CREATE ...