delphi 的Memo1.lines.string问题
要求是做一个个人兴趣爱好的选择，但是很奇怪的是为什么Memo1.lines.string[0] := checkBox1.caption;赋值成功
但是后面的checkBox3-5.caption赋给Memo1.lines.string[2-4]时都是赋空字符串。

Delphi(Pascal) code

procedure TForm1.Button1Click(Sender: TObject);begin{  if checkbox1.Checked = true then    memo1.Lines.Strings[0] := (checkbox1.Caption);   } { if checkbox2.Checked = true then    memo1.Lines.strings[1] := checkbox2.Caption;  }    //memo1.Lines.Add(checkbox2.Caption);  if checkbox3.Checked = true then  begin    memo1.Lines.strings[2] := checkbox3.Caption;    ShowMessage(memo1.Lines.strings[2]);  end;    //memo1.Lines.Add(checkbox2.Caption);  if checkbox4.Checked = true then  begin    memo1.Lines.strings[3] := checkbox4.Caption;    ShowMessage(memo1.Lines.strings[3]);  end;    //memo1.Lines.Add(checkbox3.Caption);  if checkbox5.Checked = true then    //memo1.Lines.strings[4] := checkbox5.Caption;    memo1.Lines.Add(checkbox4.Caption);  end;

Delphi(Pascal) code

procedure TForm1.FormCreate(Sender: TObject);var  i: integer;begin  Memo1.Clear;  for i := 0 to 4 do    Memo1.Lines.Add('');end;procedure TForm1.Button1Click(Sender: TObject);begin  if CheckBox3.Checked = true then  begin    Memo1.Lines.Strings[2] := CheckBox3.Caption;    ShowMessage(Memo1.Lines.Strings[2]);  end;  if CheckBox4.Checked = true then  begin    Memo1.Lines[3] := CheckBox4.Caption;    ShowMessage(Memo1.Lines[3]);  end;  if CheckBox5.Checked = true then  begin    Memo1.Lines.Strings[4] := CheckBox5.Caption;    ShowMessage(Memo1.Lines[4]);  end;end;
[解决办法]
procedure TForm1.FormCreate(Sender: TObject);
var
 i: integer;
begin
 Memo1.Clear;
 //for i := 0 to 4 do
 //  Memo1.Lines.Add('');
end;