Delphi 设计模式：《HeadFirst设计模式》Delphi7代码---工厂模式之简单工厂[转]

    简单工厂：工厂依据传进的参数创建相应的产品。

  1
  2{《HeadFirst设计模式》工厂模式之简单工厂 }
  3{ 产品类                              }
  4{ 编译工具 ：Delphi7.0                 }
  5{ 联系方式 ：guzh-0417@163.com         }
  6
  7unit uProducts;
  8
  9interface
 10
 11type
 12  TPizza = class(TObject)
 13  public
 14    procedure Prepare; virtual; abstract;
 15    procedure Bake; virtual; abstract;
 16    procedure Cut; virtual; abstract;
 17    procedure Box; virtual; abstract;
 18  end;
 19
 20  TCheesePizza = class(TPizza)
 21  public
 22    procedure Prepare; override;
 23    procedure Bake; override;
 24    procedure Cut; override;
 25    procedure Box; override;
 26  end;
 27
 28  TVeggiePizza = class(TPizza)
 29  public
 30    procedure Prepare; override;
 31    procedure Bake; override;
 32    procedure Cut; override;
 33    procedure Box; override;
 34  end;
 35
 36  TClamPizza = class(TPizza)
 37  public
 38    procedure Prepare; override;
 39    procedure Bake; override;
 40    procedure Cut; override;
 41    procedure Box; override;
 42  end;
 43
 44  TPepperoniPizza = class(TPizza)
 45  public
 46    procedure Prepare; override;
 47    procedure Bake; override;
 48    procedure Cut; override;
 49    procedure Box; override;
 50  end;
 51
 52implementation
 53
 54{ TCheesePizza }
 55
 56procedure TCheesePizza.Bake;
 57begin
 58  Writeln(‘烘烤奶油比萨‘);
 59end;
 60
 61procedure TCheesePizza.Box;
 62begin
 63  Writeln(‘将奶油比萨装盒‘);
 64end;
 65
 66procedure TCheesePizza.Cut;
 67begin
 68  Writeln(‘将奶油比萨切成片‘);
 69end;
 70
 71procedure TCheesePizza.Prepare;
 72begin
 73  Writeln(‘准备奶油比萨‘);
 74end;
 75
 76{ TVeggiePizza }
 77
 78procedure TVeggiePizza.Bake;
 79begin
 80  Writeln(‘烘烤素比萨‘);
 81end;
 82
 83procedure TVeggiePizza.Box;
 84begin
 85  Writeln(‘将素比萨装盒‘);
 86end;
 87
 88procedure TVeggiePizza.Cut;
 89begin
 90   Writeln(‘将素比萨切成片‘);
 91end;
 92
 93procedure TVeggiePizza.Prepare;
 94begin
 95  Writeln(‘准备素比萨‘);
 96end;
 97
 98{ TClamPizza }
 99
100procedure TClamPizza.Bake;
101begin
102  Writeln(‘烘烤蛤蛎比萨‘);
103end;
104
105procedure TClamPizza.Box;
106begin
107  Writeln(‘将蛤蛎比萨装盒‘);
108end;
109
110procedure TClamPizza.Cut;
111begin
112   Writeln(‘将蛤蛎比萨切成片‘);
113end;
114
115procedure TClamPizza.Prepare;
116begin
117  Writeln(‘准备蛤蛎比萨‘);
118end;
119
120{ TPepperoniPizza }
121
122procedure TPepperoniPizza.Bake;
123begin
124  Writeln(‘烘烤Pepperoni比萨‘);
125end;
126
127procedure TPepperoniPizza.Box;
128begin
129  Writeln(‘将Pepperoni比萨装盒‘);
130end;
131
132procedure TPepperoniPizza.Cut;
133begin
134   Writeln(‘将Pepperoni比萨切成片‘);
135end;
136
137procedure TPepperoniPizza.Prepare;
138begin
139  Writeln(‘准备Pepperoni比萨‘);
140end;
141
142end.

 1
 2{《HeadFirst设计模式》工厂模式之简单工厂 }
 3{ 简单工厂类                           }
 4{ 编译工具 ：Delphi7.0                 }
 5{ 联系方式 ：guzh-0417@163.com         }
 6
 7unit uSimpleFactory;
 8
 9interface
10
11uses
12  uProducts;
13
14type
15  { 静态工厂 }
16  TSimplePizzaFactory = class(TObject)
17  public
18    class function CreatePizza(Category: Integer): TPizza;
19  end;
20
21implementation
22
23{ TSimplePizzaFactory }
24
25class function TSimplePizzaFactory.CreatePizza(Category: Integer): TPizza;
26begin
27  case Category of
28    0: Result := TCheesePizza.Create;    {创建奶油比萨      }
29    1: Result := TVeggiePizza.Create;    {创建素比萨        }
30    2: Result := TClamPizza.Create;      {创建蛤蛎比萨      }
31    3: Result := TPepperoniPizza.Create; {创建Pepperoni比萨 }
32  else
33    Result := nil;
34  end; // end case.
35end;
36
37end.

 1
 2{《HeadFirst设计模式》工厂模式之简单工厂 }
 3{ 简单工厂的用户类                      }
 4{ 编译工具 ：Delphi7.0                 }
 5{ 联系方式 ：guzh-0417@163.com         }
 6
 7unit uUserOfSimpleFactory;
 8
 9interface
10
11uses
12  uProducts, uSimpleFactory;
13
14type
15  { 工厂的用户 }
16  TPizzaStore = class(TObject)
17  public
18    procedure OrderPizza;
19  end;
20
21implementation
22
23{ TOrderPizza }
24
25procedure TPizzaStore.OrderPizza;
26var
27  aPizza: TPizza;
28begin
29  aPizza := TSimplePizzaFactory.CreatePizza(0);
30
31  aPizza.Prepare();
32  aPizza.Bake();
33  aPizza.Cut();
34  aPizza.Box();
35
36  aPizza.Free;
37end;
38
39end.

 1
 2{《HeadFirst设计模式》工厂模式之简单工厂 }
 3{ 客户端                              }
 4{ 编译工具 ：Delphi7.0                 }
 5{ 联系方式 ：guzh-0417@163.com         }
 6
 7program pPizzaStoreTest;
 8
 9{$APPTYPE CONSOLE}
10
11uses
12  uProducts in ‘uProducts.pas‘,
13  uSimpleFactory in ‘uSimpleFactory.pas‘,
14  uUserOfSimpleFactory in ‘uUserOfSimpleFactory.pas‘;
15
16var
17  aPizzaStore: TPizzaStore;
18
19begin
20  aPizzaStore := TPizzaStore.Create;
21  aPizzaStore.OrderPizza;
22  aPizzaStore.Free;
23
24  Readln;
25end.

运行结果：