-------------Delphi7沒有泛型

開發環境是Delphi XE （是XE，不是XE2，不是XE10）

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--------------Unit 開始-

unit Unit1;

interface

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

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Button3: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

Tmycalss=class
private
type
TMyRecord=record
s:string;
end;
public
Myr:TmyreCord;
end;
{
泛型：宣告定義的時候看上去就是把型別當成形參一樣的東西用T表示，當然也可以用其他的字元代替;
在使用的時候把<T> 中的T看成是實參，實參是型別
比如:
var
ss:TMygeneric<String> ;
}
TMygeneric<T> =array[0..9] of T ; //TMygeneric<sss> =array[0..9] of sss;這個也可以的

TmyGenericClass<T>=class
private

end;
var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
ss:TMygeneric<String>; //泛型
i:Integer;
begin
for i:=0 to 9 do
begin
ss[i]:=IntToStr(i);
end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
Myc:Tmycalss;
begin
Myc:=Tmycalss.Create;
Myc.Myr.s:='8888';
ShowMessage(Myc.Myr.s); //看下類中類
FreeAndNil(Myc);
end;

procedure TForm1.Button3Click(Sender: TObject);
var
MyArrayc:TMygeneric<Tmycalss>; //泛型
i:Integer;
begin
for i:=0 to 9 do
begin
MyArrayc[i]:=Tmycalss.Create;
MyArrayc[i].Myr.s:='498789';
end;
for i:=0 to 9 do
begin
FreeAndNil(MyArrayc[i]);
end;
end;

end.

-------------Unit結束-----

--------Form 開始--------

object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 175
ClientWidth = 170
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
PixelsPerInch = 96
TextHeight = 13
object Button1: TButton
Left = 48
Top = 24
Width = 75
Height = 25
Caption = 'Button1'
TabOrder = 0
OnClick = Button1Click
end
object Button2: TButton
Left = 48
Top = 72
Width = 75
Height = 25
Caption = 'Button2'
TabOrder = 1
OnClick = Button2Click
end
object Button3: TButton
Left = 48
Top = 119
Width = 75
Height = 25
Caption = 'Button3'
TabOrder = 2
OnClick = Button3Click
end
end

-------Form 結束---------