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   ► KBTo/From GuidesDelphi Prism  Print This     

Overriding (Delphi Prism and PHP Cross Reference Guide)

By Mike Prestwood

Delphi Prism versus PHP: A side by side comparison between Delphi Prism and PHP.

 
OOP Details
 

More object oriented (OO) stuff.

Overriding

[Other Languages] 

General Info: Method Overriding

Where you define or implement a virtual method in a parent class and then replace it in a descendant class.

When you decide to declare a method as virtual, you are giving permission to derived classes to extend and override the method with their own implementation. You can have the extended method call the parent method's code too.

In most OO languages you can also choose to hide a parent method. When you introduce a new implementation of the same named method with the same signature without overriding, you are hiding the parent method.

Delphi Prism:   virtual, override

Same as Delphi. In Prism, you specify a virtual method with the virtual keyword in a parent class and extend (or replace) it in a descendant class using the override keyword. Call Inherited in the descendant method to execute the code in the parent method.

Use final to prevent further extending of a member and Sealed to prevent all members of a class from further extension.

Syntax Example:
Robot = class(System.Object)
public
method Speak; virtual;
end;
  
Cyborg = class(Robot)
public
method Speak; override;
end;
[Not specified yet. Coming...]












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