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2.ÐéÄâ·½·¨ (Virtual)
3.¶¯Ì¬·½·¨ (Dynamic)
4.ÏûÏ¢·½·¨ (Message)
5.³éÏó·¨·½ (Abstract)
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1£©¾²Ì¬·½·¨[static]
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eg£º
type
      TAnimal = class(TObject)
      procedure Sound;
      procedure Sleep;
      ... ...
end;
      ... ...
TDog = class(TAnimal)
      procedure Sound;
      function Sleep:Integer;
      ... ...
end;
¾²Ì¬·½·¨²»Äܱ»ÖØÔØ£¬ÉÏÀýÖУ¬ÅÉÉúÀàµÄ¾²Ì¬·½·¨Ö»ÊÇÌæ»»ÁË»ùÀàµÄ¾²Ì¬·½
·¨¡£¼´Ê¹Sleep·½·¨ÔÚTAnimalÖбíÏÖΪ¹ý³Ì¶øÔÚTDogÀàÖбíÏÖΪº¯Êý¡£
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2£©ÐéÄâ·½·¨[virtual]
ÐéÄâ·½·¨±È¾²Ì¬·½·¨¸üÁé»î¡¢¸ü¸´ÔÓ¡£ÐéÄâ·½·¨µÄµØÖ·²»ÊÇÔÚ±àÒëʱȷ¶¨µÄ
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eg:
type
      TAnimal = class(TObject)
      procedure Eat;
      procedure Sound; virtual;
      procedure Sleep; dynamic;
      ... ...
      end;
      TDog = class(TAnimal)
      procedure Sound; override;  //ÖØÔØ
      function Sleep:Integer; override;
      ... ...
      end;
Ö»ÓÐvirtualºÍdynamic¿ÉÒÔ±»override£¬static²»Äܱ»override(ÖØÔØ)¡£
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3£©¶¯Ì¬·½·¨[dynamic]
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delphiÖÐDateTimePickerͬʱÐÞ¸ÄÈÕÆÚºÍʱ¼äµÄʵÏÖ

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    1¡¢kind -> dtktime Ò²¿ÉÒÔÊÇdtkdate µ«ÊÇÔÚÓÃdtkdateµÄʱºòÐèÒª½«datemodeÊôÐÔÐ޸ijÉdmUpDown
    2¡¢parseinput -> true
µÚ¶þ²½£ºÔÚonUserInputʼþÖÐдһ¾ä´úÂë
DateTimePicker1.DateTime:=DateAndTime;
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delphi virtual dynamic

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use Filectrl;
procedure TForm1.Button1Click(Sender: TObject);
var
Dir: String;
begin
SelectDirectory('Select a directory', '', Dir);
ShowMessage(Dir);
end; ......

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