状态模式
【1】什么是状态模式？
不同的状态，不同的行为。或者说，每个状态有着相应的行为。
【2】状态模式的代码示例：
代码示例：
1 #include <iostream>
2 #include <string>
3 using namespace std;
4
5 class Work;
6 class State;
7 class ForenonnState;
8
9
10 class State
11 {
12 public:
13 virtual void writeProgram(Work*) = 0;
14 };
15
16 class Work
17 {
18 public:
19 int hour;
20 State *current;
21 Work();
22 void writeProgram()
23 {
24 current->writeProgram(this);
25 }
26 };
27
28 class EveningState : public State
29 {
30 public:
31 void writeProgram(Work *w)
32 {
33 cout << "当前时间: " << w->hour << "心情很好，在看《明朝那些事儿》，收获很大！" << endl;
34 }
35 };
36
37 class AfternoonState : public State
38 {
39 public:
40 void writeProgram(Work *w)
41 {
42 if (w->hour < 19)
43 {
44 cout << "当前时间: " << w->hour << "下午午睡后，工作还是精神百倍!" << endl;
45 }
46 else
47 {
48 w->current = new EveningState();
49 w->writeProgram();
50 }
51 }
52 };
53
54 class ForenonnState : public State
55 {
56 public:
57 void writeProgram(Work *w)
58 {
59 if (w->hour < 12)
60 {
61 cout << "当前时间: " << w->hour << "上午工作精神百倍!" << endl;
62 }
63 else
64 {
65 w->current = new AfternoonState();
66 w->writeProgram();
67 }
68 }
69 };
70
71 Work::Work()
72 {
73 current = new ForenonnState();
74 }
75
76 int main()
77 {
78 Work *w = new Work();
79 w->hour = 21;
80 w->writeProgram();
81 return 0;
82 }
83 //Reuslt:
84 //当前时间: 21心情很好，在看《明朝那些事儿》，收获很大！
Good Good Study, Day Day Up.
顺序 选择 循环 总结
