unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
type
  TStud=class(TObject)
    public
      studname:String;
      age :integer;
      function toString(): String;
    private
  end;
var
  Form1: TForm1;
  list:TList<String>;
  studList:TList<TStud>;
implementation

{$R *.dfm}

{*
The Tiburon Generics.Collections unit includes: TList, TQueue, TStack, TDictionary, TObjectList, TObjectQueue, TObjectStack, and TObjectDictionary.
*}
function TStud.toString;
begin
  toString:= studname+ ' - '+ inttostr(age);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
   list.Free;
   studList.Free;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  str:string;
  i:integer;
  j:integer;
  stud:TStud;
begin
   list:=TList<String>.Create;
   studList:=TList<TStud>.Create;
   stud.Create ;
   stud.studname:='小裴';
   stud.age:=26;
   studList.Add(stud);

   list.Add('A');
   list.Add('B');
   list.Add('C');
   for i := 0 to List.Count - 1 do
      str:=str+'-'+list.Items[i];

   edit1.Text:=str;
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  i:integer;
  str:string;
begin
  try
     list.Delete(0);
  except
     showmessage('超出范围');
  end;

  for i := 0 to List.Count - 1 do
    str:=str+'-'+list.Items[i];
  edit1.Text:=str;
end;

end.