unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    procedure Button1Click(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}uses Generics.Collections;procedure TForm1.Button1Click(Sender: TObject);var  List: TList
    
     ;  b: Boolean;begin  List := TList
     
      .Create();  List.AddRange(['AA', 'BB', 'CC']);  ShowMessageFmt('%s : %s', [List[1], List.Items[1]]); {BB : BB}  b := List.Contains('BB');  ShowMessage(BoolToStr(b, True)); {True}  b := List.Contains('DD');  ShowMessage(BoolToStr(b, True)); {False}  List.Free;end;end.