A Singleton class is a design pattern that restricts the instantiation of a class to one single object throughout the lifecycle of a program. This is useful when exactly one object is needed to coordinate actions across the system — such as logging, configuration ...
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A constructor is a special method automatically called when an object is created using CREATE OBJECT or NEW. Types of Constructors in ABAP Type Method Name Called On Purpose Instance Constructor CONSTRUCTOR When an ...
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 ...
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 ...
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 ...