详测 Generics Collections TList (8): Sort

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, Generics.Defaults;

procedure TForm1.Button1Click(Sender: TObject);
var
List: TList<Integer>;
i: Integer;
str: string;
begin
List := TList<Integer>.Create();
List.AddRange([22,33,11]);

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

{排序}
List.Sort;
str := '';
for i in List do str := str + IntToStr(i) + ' ';
ShowMessage(str); {11 22 33 }

{倒排序}
List.Sort(TComparer<Integer>.Construct(
function (const n1,n2: Integer): Integer
begin
Result := n2 - n1;
end));

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

List.Free;
end;

end.