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December Edition

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► KB ► Programming ► Delphi Prism ► OOP

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Prism Code Snippet:

To/From Code Guide: Delphi Prism Prevent... vs. Other Languages

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A code snippet from our Prism Code Snippets Page

Tags: Delphi Prism , Prevent Derivation

Delphi Prism Prevent Derivation (sealed, final)

Same keywords as Delphi (sealed uses slightly different syntax). With Prism, use the sealed keyword before the class keyword to prevent a class from being inherited from and use the final keyword to prevent a method from being overridden.

type

  Robot = public sealed class(System.Object) 
  public
    method Speak(pSentence: String); virtual; final;
  end;

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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: Multiple Choice

You prevent class and method inheritance with what keyword(s)?

Answer:

Robot = public final class(System.Object)

public

 method x(); virtual; sealed;

end;

Robot = public sealed class(System.Object)

public

 method x(); virtual; final;

end;

Robot = public sealed class(System.Object)

public

 method x(); virtual; sealed;

end;

Robot = public final class(System.Object)

public

 method x(); virtual; final;

end;

Robot = public NotOverridable class(Object)

public

 method x(); virtual; NotInheritable;

end;

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Since 2/9/2009