oop - 哪个类(class)设计更好？

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哪个类(class)设计更好，为什么？

public class User
{
    public String UserName;
    public String Password;
    public String FirstName;
    public String LastName;
}

public class Employee : User
{
    public String EmployeeId;
    public String EmployeeCode;
    public String DepartmentId;
}

public class Member : User
{
    public String MemberId;
    public String JoinDate;
    public String ExpiryDate;
}

或者

public class User
{
    public String UserId;
    public String UserName;
    public String Password;
    public String FirstName;
    public String LastName;
}

public class Employee
{
    public User UserInfo;
    public String EmployeeId;
    public String EmployeeCode;
    public String DepartmentId;
}

public class Member
{
    public User UserInfo;
    public String MemberId;
    public String JoinDate;
    public String ExpiryDate;
}

Answer 1

通过认识到继承建模“IS-A”关系，而成员身份建模“HAS-A”关系，可以简单地回答这个问题。

员工是用户

员工有一个用户信息

哪一个是正确的？这是你的答案。