SAP CLASS COMPONENTS documentation, setup help and example usage

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Components of Classes
The content of a class is composed of components. The components define the attributes of objects of a class. Each component is declared in the
definition of the class in one of the four visibility sections that the interfaces define externally. Within a class, all its components are visible. All components are in the same namespace, which means that the names of all components in a class must be different.
The individual components are:

Attributes

Methods

Events

Types and constants

SAP makes a distinction between components of this type that are available on an instance-dependent basis for every object, and instance-
independent components that are only available once in a class. The instance-dependent components are called instance components ; the instance-independent components are known as static components .
In ABAP objects, classes can define the components listed above. Since all components that can be declared in classes can also be declared in interfaces, this description also applies to interfaces.
The components of classes can be
accessed internally, and depending on the visibility, also from outside the class. If they are accessed externally, component selectors must be used for addressing.