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   ► KBDesktop Data...Paradox & Ob...ObjectPAL Co...OPAL: OOP   Print This     
 
Paradox OPAL: OOP:
ObjectPAL Inheritance (Not Supported)
 
Posted 11 years ago on 10/23/2008 and updated 1/24/2009
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KB101395

General Info: Inheritance

The concept of a class makes it possible to define subclasses that share some or all of the main class characteristics. This is called inheritance. Inheritance also allows you to reuse code more efficiently. In a class tree, inheritance is used to design classes vertically. (You can use Interfaces to design classes horizontally within a class tree.) With inheritance, you are defining an "is-a" relationship (i.e. a chow is-a dog). Analysts using UML call this generalization where you generalize specific classes into general parent classes.

ObjectPAL Inheritance

ObjectPAL does not support class creation nor sub-classing (inheritance).

More Info

Definition:  Inheritance

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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Linked Certification Question(s)

The following are practice certification questions with answers highlighted. These questions were prepared by Mike Prestwood and are intended to stress an important aspect of this KB post. All our practice questions are intended to prepare you generally for passing any certification test as well as prepare you for professional work.

Advanced

1 Advanced Level Question

Question #1: Yes or No?

Does ObjectPAL support developer defined class inheritance?

Answer:
  • Yes
  • No

  •  KB Article #101395 Counter
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