详测 Generics Collections TList (6): Reverse、TrimExcess

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}



uses Generics.Collections;



procedure TForm1.Button1Click(Sender: TObject);

var

  List: TList<Byte>;

  b: Byte;

  str: string;

begin

  List := TList<Byte>.Create();

  List.Add(11);

  List.Add(22);

  List.Add(33);



  str := '';

  for b in List do str := str + IntToStr(b) + ' '; {11 22 33 }

  ShowMessage(str);



  List.Reverse;

  str := '';

  for b in List do str := str + IntToStr(b) + ' '; {33 22 11 }

  ShowMessage(str);



  ShowMessage(IntToStr(List.Capacity)); {4}

  List.TrimExcess;

  ShowMessage(IntToStr(List.Capacity)); {3}



  List.Free;

end;



end.