3.1 自封装字段

【1】源代码

 1 class Student
 2 {
 3     typedef enum { MALE, FEMALE } SEX;
 4 
 5 public:
 6     QString m_name;
 7     int m_nAge;
 8     SEX m_sex;
 9     QString m_strID;
10     QString m_department;
11 };

【2】自封装字段

 1 // 自封装
 2 class Student
 3 {
 4     typedef enum { MALE, FEMALE } SEX;
 5 
 6 public:
 7     QString getName()
 8     {
 9         return m_name;
10     }
11     void setName(QString name)
12     {
13         m_name = name;
14     }
15     int getAge()
16     {
17         return m_nAge;
18     }
19     void setName(int nAge)
20     {
21         m_nAge = nAge;
22     }
23     SEX getSex()
24     {
25         return m_sex;
26     }
27     void setSex(SEX sex)
28     {
29         m_sex = sex;
30     }
31     QString getID()
32     {
33         return m_ID;
34     }
35     void setID(QString id)
36     {
37         m_ID = id;
38     }
39     QString getDepartment()
40     {
41         return m_department;
42     }
43     void setDepartment(QString department)
44     {
45         m_department = department;
46     }
47 
48 private:
49     QString m_name;
50     int m_nAge;
51     SEX m_sex;
52     QString m_ID;
53     QString m_department;
54 };

【3】总结

直接访问一个字段，但与字段之间的耦合关系逐渐变得笨拙。

为这个字段建立取值/设值函数，并且只以这些函数来访问字段。

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顺序选择循环总结