两个 tstrings.create 出错
个位大侠帮我看看为什么运行不了，怎么解决

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;

type
TForm1 = class(TForm)
Button1: TButton;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;
L1: Tstrings;
implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
L1.Create;
L1.Add( 'L1 ');

end;

procedure TForm1.Button1Click(Sender: TObject);
var L2: Tstrings;
begin
L2.Create;
L2.Add( 'L2 ');
showmessage(L1.Text);
showmessage(L2.Text);
L2.Free;

end;

end.



[解决办法]
var
L1:tstrings;
begin
L1:=tstringlist.Create;
L1.text:= 'L1 ';
showmessage(L1[0]);
end;
应该可以了
[解决办法]
不能创建抽象类的实例