visibility sections

[Former Member]

what are public,private,protected components and their purpose

[matt]

A public component is available outside of the class. A private component is available only inside the class. A protected component is available only inside the class and any subclasses (or friends of the class).

The purpose of the three visibilities is to encapsulate - i.e. only expose to external manipulation what needs to be exposed, and hide everything else - and to allow for inheritance.

How you actually use them depends on the application.

matt

[Former Member]

hi,

Public attributes

Public attributes are defined in the PUBLIC section and can be viewed and changed from outside the class. There is direct access to public attributes. As a general rule, as few public attributes should be defined as possible.

PUBLIC SECTION.

DATA: Counter type i.

Private attributes

Private attributes are defined in the PRIVATE section. The can only be viewes and changed from within the class. There is no direct access from outside the class.

PRIVATE SECTION.

DATA: name(25) TYPE c,

planetype LIKE saplane-planetyp,

Protected components

When we are talking subclassing and enheritance there is one more component than Public and Private, the Protected component. Protected components can be used by the superclass and all of the subclasses. Note that Subclasses cannot access Private components.

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Edited by: Marcelo Ramos on Nov 28, 2008 2:40 PM

[Former Member]

This message was moderated.