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Delphi Éè¼ÆÄ£Ê½£º¡¶HeadFirstÉè¼ÆÄ£Ê½¡·Delphi7´úÂë

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1.ÈÝÆ÷ÖеÄÔªËØÀà
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unit uItem;

interface

type
TMenuItem = class(TObject)
private
FName: String;
FDescription: String;
FVegetarian : Boolean;
FPrice: Double;
public
constructor Create(aName, aDescription: String;
aVegetarian : Boolean;
aPrice: Double);
function GetName: String;
function GetDescription: String;
function GetPrice: Double;
function IsVegetarian: Boolean;
end;

implementation

{ TMenuItem }

constructor TMenuItem.Create(aName, aDescription: String;
aVegetarian: Boolean;
aPrice: Double);
begin
FName := aName;
FDescription := aDescription;
FVegetarian := aVegetarian;
FPrice := aPrice;
end;

function TMenuItem.GetDescription: String;
begin
Result := FDescription;
end;

function TMenuItem.GetName: String;
begin
Result := FName;
end;

function TMenuItem.GetPrice: Double;
begin
Result := FPrice;
end;

function TMenuItem.IsVegetarian: Boolean;
begin
Result := FVegetarian;
end;

end.

2.µü´úÆ÷
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{ ±àÒ빤¾ß£ºDelphi7.0 }
{ E-Mail £ºxshlife@163.com }

unit uIterator;

interface

uses
uItem;

type
TMenuItems = array of TMenuItem;

TIterator = class(TObject)
public
function HasNext: Boolean; virtual; abstract;
function Next : TObject; virtual; abstract;
end;

TDinerMenuIter


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unit uProducts;

interface

type
TPizza = class(TObject)
public
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Delphi Éè¼ÆÄ£Ê½£º¡¶HeadFirstÉè¼ÆÄ£Ê½¡·Delphi7´úÂë

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unit uWeatherReport;

interface

uses
Classes, SysUtils;

type
TObserver = class; { ForwardÉùÃ÷£¬´´½¨Á½¸öÏà ......

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