unit Unit1;

interface

uses
  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}

//TStringBuilder 的插入与删除
procedure TForm1.Button1Click(Sender: TObject);
var
  sb: TStringBuilder;
begin
  sb := TStringBuilder.Create;
  sb.Append('CodeGear 2007');

  sb.Insert(Length('CodeGear '), 'Delphi ');
  ShowMessage(sb.ToString);      {CodeGear Delphi 2007}

  sb.Remove(Length('CodeGear Delphi'), Length(' 2007'));
  ShowMessage(sb.ToString);      {CodeGear Delphi}

  sb.Insert(sb.Length, ' 2009');
  ShowMessage(sb.ToString);      {CodeGear Delphi 2009}

  sb.Free;
end;

end.