两个 tstrings.create 出错

[fzfei2]

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.

[yintao1021]

TStingList是TStrings的派生类，TStrings是一个抽象类，他只提供类的框架，但没有实现

[yintao1021]

var
L1:tstrings;
begin
L1:=tstringlist.Create;
aa.text:='L1';
showmessage(aa[0]);
end;
应该可以了

[yintao1021]

var
L1:tstrings;
begin
L1:=tstringlist.Create;
L1.text:='L1';
showmessage(L1[0]);
end;
应该可以了

[仙侣步惊云]

不能创建抽象类的实例

[fzfei2]

谢谢各位！！！！！！！！！！