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.