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► KB ► To/From Guides ► Delphi ► Language Details

Inheritance (Cross Ref > Language Details)

By Mike Prestwood

Delphi versus C++/CLI: A side by side comparison between Delphi and C++/CLI.

OOP Basics

Some languages support object-based concepts such as Paradox, Access, and VB Classic. Other languages have OO extensions and fully support object orientation in a hybrid fashion (such as C++ and Dephi for Win32). Finally, some lanages such as C#, VB.Net, Prism, and Java are entirely written in OO. Meaning, every line of code written must occur within a class).

Inheritance

[Other Languages]

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.

Delphi: =class(ParentClass)

In Delphi, you use the class keyword followed by the parent class in parens. If you leave out the parent class, your class inherits from TObject.

Syntax Example:

In the following example, a terminator T-600 is-an android.

TAndroid = class

end;

T-600 = class(TAndroid)

end;

Delphi Inheritance (=class(ParentClass)) 1 certification question.

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