unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

//TStringBuilder.Create 可以无参数
procedure TForm1.Button1Click(Sender: TObject);
var
  sb: TStringBuilder;
begin
  sb := TStringBuilder.Create;
  sb.Append('Embarcadero');
  sb.Append(' CodeGear');
  sb.Append(' Delphi');
  sb.Append(' 2009');

  ShowMessage(sb.ToString); {Embarcadero CodeGear Delphi 2009}
  sb.Free;
end;

//TStringBuilder.Create 可用字符串初始化; 其他重载用处不大
procedure TForm1.Button2Click(Sender: TObject);
var
  sb: TStringBuilder;
begin
  sb := TStringBuilder.Create('Delphi ');
  sb.Append(2009);

  ShowMessage(sb.ToString); {Delphi 2009}
  sb.Free;
end;

end.