Prestwood IT: Base Class (Cross Reference Coding Encyclopedia: Delphi)

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Base Class

Languages Focus

When you create a class, it is either a base class or inherits from another class. Some languages require all classes to inherit from a common base class and some do not.

Delphi: TObject

In Delphi programming language (Object Pascal), all classes ultimately inherit from the base class TObject.

Syntax Example:

//Specify both namespace and class:

TCyborg = class(System.TObject)
end;

//Use shortcut alias:

TCyborg = class(TObject)
end;

//None, default is System.TObject

TCyborg = class
end;

Delphi Base Class (TObject) 1 certification question.

Cross Reference Examples:

Access VBA: Not Supported

ASP Classic: Not Supported

C#: System.Object

In C#, the Object keyword is an alias for the base System.Object class and is the single base class all classes ultimately inherit from.

Syntax Example: 1 certification question.

//Specify both namespace and class:

public class Cyborg : System.Object

{ }

//Use shortcut alias:

public class Cyborg : Object

{ }

//None, default is System.Object

public class Cyborg

{ }

C++/CLI: System::Object

In C++/CLI, the Object keyword is an alias for the base System::Object class and is the single base class all classes ultimately inherit from.

More Info / Comment

Corel Paradox: Not Supported

Delphi Prism: System.Object

In Prism, the Object keyword is an alias for the base System.Object class and is the single base class all classes ultimately inherit from.

Syntax Example: 1 certification question.

//Specify both namespace and class:

Cyborg = class(System.Object)
end;

//Use Object keyword for System.Object.

Cyborg = class(Object)

end;

//When none, default is System.Object.

Cyborg = class

end;

Java: Object

The Object class is Java's single base class all classes ultimately inherit from.

Syntax Example:

public class Cyborg {

or you can specify the base class (or any other class):

public class Cyborg extends Object {

JavaScript: Not Supported

VB Classic: Not Supported

VB.Net: System.Object

In VB.Net, the Object keyword is an alias for the base System.Object class and is the single base class all classes ultimately inherit from. Use the Inherits keyword to indicate the parent class and Inherits must precede all declarations in a class.

Syntax Example: 1 certification question.

'Specify both namespace and class:

Public Class Cyborg
  Inherits System.Object

End Class

'Use Object alias for System.Objct:

Public Class Cyborg
  Inherits Object

End Class

'Default when not specified is System.Object:

Public Class Cyborg

End Class