类的类方法

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;

var
  Form1: TForm1;

implementation

{$R *.dfm}
type
  TBoolean =  class
    class function BooleanToString(AValue: Boolean): string;
  end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  MessageDlg(TBoolean.BooleanToString(Button1.Enabled), mtInformation, [mbOK], 0);
end;

{ TBoolean }

class function TBoolean.BooleanToString(AValue: Boolean): string;
const
  Bools: array[Boolean] of string = ('False', 'True');
begin
  Result := Bools[AValue];
end;

end.