Decorator pattern Starbucks coffee (C # source code)

1. Using system;
2. Using system. Collections. Generic;
3. Using system. LINQ;
4. Using system. text;
6. Namespace Decker
7. {
8. Class crunmain
9. {
10. Static void main (string [] ARGs)
11. {
12. Cbeverage objbev = new cespresso ();
13. Cbeverage objbev2 = NULL;
15. Console. writeline (objbev. getdescription () + "$" + objbev. Cost ());
17. Objbev2 = new chouseblend ();
18. Objbev2 = new cmocha (objbev2 );
19. Objbev2 = new cmocha (objbev2 );
20. Objbev2 = new cmocha (objbev2 );
21. Console. writeline (objbev2.getdescription () + "$" + objbev2.cost ());
22. }
23. };
25. // Beverage
26. Public abstract class cbeverage
27. {
28. Public Virtual string getdescription ()
29. {
30. Return this. m_strdescription;
31. }
33. Public abstract double cost ();
35. Protected string m_strdescription;
36. };
38. Public abstract class ccondimentdecortor: cbeverage
39. {
40. Public abstract string getdescription ();
41. };
43. Public class cespresso: cbeverage
44. {
45. Public cespresso ()
46. {
47. This. m_strdescription = "Espresso ";
48. }
50. Public override double cost ()
51. {
52. Return 1.99;
53. }
54. };
56. Public class chouseblend: cbeverage
57. {
58. Public chouseblend ()
59. {
60. This. m_strdescription = "house blend coffee ";
61. }
63. Public override double cost ()
64. {
65. Return 0.89;
66. }
67. };
69. // Seasoning
70. Public class cmocha: ccondimentdecortor
71. {
72. Public cmocha (cbeverage objbev)
73. {
74. This. m_objbev = objbev;
75. This. m_strdescription = This. getdescription ();
76. }
78. Public override string getdescription ()
79. {
80. Return this. m_objbev.getdescription () + ", mocha ";
81. }
83. Public override double cost ()
84. {
85. If (null = This. m_objbev)
86. {
87. Throw new exception ("null = OBJ ");
88. }
90. Return 0.2 + this. m_objbev.cost ();
91. }
93. Private cbeverage m_objbev;
94. };
95. }