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Prevent Derivation◄╣

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Prevent Derivation (Java and Delphi Cross Reference Guide)

By Mike Prestwood

Java versus Delphi: A side by side comparison between Java and Delphi.

OOP Details

More object oriented (OO) stuff.

Prevent Derivation

[Other Languages]

Languages Focus

How do you prevent another class from inheriting and/or prevent a class from overriding a member.

Java: "final class" Final

In Java, there is the concept of a final class.

More Info / Comment

Delphi: "Sealed class" sealed, final

With Delphi, use the sealed keyword to prevent a class from being inherited from and use the final keyword to prevent a method from being overridden.

Syntax Example:

type

  Robot = class sealed(TObject)
  public
    procedure Speak(pSentence: String); virtual; final;
  end;

Delphi Sealed class (sealed, final) 1 certification question.