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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
TBaseClass = class
public
class procedure ClassFun; virtual;
end;
TBClass2 = class(TBaseClass)
public
class procedure ClassFun; override;
end;
TBClass3 = class(TBaseClass)
public
class procedure ClassFun; override;
end;
TClassRef = class of TBaseClass;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
c: TClassRef;
begin
ShowMessage('Call TBClass2 >>>');
c := TBClass2;
c.ClassFun;
//TBClass2.ClassFun;
ShowMessage('Call TBClass3 >>>');
c := TBClass3;
c.ClassFun;
end;
{ TBaseClass }
class procedure TBaseClass.ClassFun;
begin
ShowMessage('TBaseClass');
end;
{ TBClass2 }
class procedure TBClass2.ClassFun;
begin
inherited;
ShowMessage('TBClass2');
end;
{ TBClass3 }
class procedure TBClass3.ClassFun;
begin
inherited;
ShowMessage('TBClass3');
end;
end.