十二、详测 Generics Collections TList (3): Insert、Delete、Remove、Extract

unit Unit1;

interface

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

type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

uses
Generics.Collections;

procedure TForm1.Button1Click(Sender: TObject);
var
List: TList<Integer>;
i: Integer;
str: string;
begin
List := TList<Integer>.Create;
list.Add(111);
list.Add(222);
list.Add(333);
list.Add(444);
list.Add(555);
List.Insert(0,888); //Insert
List.Insert(2,999);
str := '';
for i in List do str := str + UIntToStr(i) + ' ';
ShowMessage(str);

List.Delete(0); //Delete
List.Delete(List.count - 1);
str := '';
for i in List do str := str + UIntToStr(i) + ' ';
ShowMessage(str);
List.Remove(333); //Remove
str := '';
for i in List do str := str + UIntToStr(i) + ' ';
ShowMessage(str);
List.Extract(222); //Extract
str := '';
for i in List do str := str + UIntToStr(i) + ' ';
ShowMessage(str);
List.Free;
end;

end.