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unit uWeatherReport;

interface

uses
Classes, SysUtils;

type
TObserver = class; { ForwardÉùÃ÷£¬´´½¨Á½¸öÏ໥ÒÀÀµµÄÀà }

{ ³éÏóÖ÷Ìâ }
TSubject = class(TObject)
procedure RegisterObserver(aObserver: TObserver); virtual; abstract;
procedure RemoveObserver (aObserver: TObserver); virtual; abstract;
procedure NotifyObserver; virtual; abstract;
end;

{ ¾ßÌåÖ÷Ìâ }
TWeatherData = class(TSubject)
private
FObservers: TList;
FTemp : Integer;
FHumidity : Integer;
FPresssure: Integer;
public
constructor Create;
destructor Destroy; override;
procedure RegisterObserver(aObserver: TObserver); override;
procedure RemoveObserver (aObserver: TObserver); override;
procedure NotifyObserver; override;
procedure MeasurementsChanged;
procedure SetMeasurements(aTemp, aHumidity, aPresssure: Integer);
end;

{**************************************************************************}

{ ³éÏó¹Û²ìÕß }
TObserver = class(TObject)
procedure UpDate(Temp, Humidity, Presssure: Integer); virtual; abstract;
procedure Display; virtual; abstract;
end;

{ ¾ßÌå¹Û²ìÕß }
TCurrentConditionsDisplay = class(TObserver)
private
FTemp : Integer;
FHumidity : Integer;
FWeatherData: TSubject;
public
constructor Create(aWeatherData: TSubject);
destructor Destroy; override;
procedure UpDate(aTemp, aHumidity, aPresssure: Integer); override;
procedure Display; override;
end;

implementation

{ TWeatherData }

constructor TWeatherData.Create;
begin
FObservers := TList.Create;
end;

destructor TWeatherData.Destroy;
begin
FObservers.Clear;
FreeAndNil(FObservers);
inheri


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Delphi Éè¼ÆÄ£Ê½£º¡¶HeadFirstÉè¼ÆÄ£Ê½¡·Delphi´úÂë

1. ³éÏ󹤳§µÄ²úÆ·
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{ ³éÏ󹤳§µÄ²úÆ· }
{ ±àÒ빤¾ß£ºDelphi7.0 }
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unit uPizzaIngredient;

interface

type
TDough = class(TObject)
end;

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delphi Àà³ÉÔ±ÐÅÏ¢µØÖ··ÖÎö

 //¶¨ÒåMyClass
TMyClass = class
GUID: string;
Name: string;
bSex: Boolean;
Tel : string;
end;
//ȡֵ
var
obj: TMyClass;
begin
obj := TMyClass.Create;
with Memo1.Lines do
begin
Add('¶ÔÏó´óС:' + IntToStr(obj.InstanceSize));
Add('¶ÔÏóËùÔÚµØÖ·£º'+ ......
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