3.1 自封装字段

【1】源代码

class Student
{
    typedef enum { MALE, FEMALE } SEX;

public:
    QString m_name;
    int m_nAge;
    SEX m_sex;
    QString m_strID;
    QString m_department;
};

【2】自封装字段

// 自封装
class Student
{
    typedef enum { MALE, FEMALE } SEX;

public:
    QString getName()
    {
        return m_name;
    }
    void setName(QString name)
    {
        m_name = name;
    }
    int getAge()
    {
        return m_nAge;
    }
    void setName(int nAge)
    {
        m_nAge = nAge;
    }
    SEX getSex()
    {
        return m_sex;
    }
    void setSex(SEX sex)
    {
        m_sex = sex;
    }
    QString getID()
    {
        return m_ID;
    }
    void setID(QString id)
    {
        m_ID = id;
    }
    QString getDepartment()
    {
        return m_department;
    }
    void setDepartment(QString department)
    {
        m_department = department;
    }

private:
    QString m_name;
    int m_nAge;
    SEX m_sex;
    QString m_ID;
    QString m_department;
};

【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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