User类

public class User {
    private String m_Name;
    private String m_Password;
    private String m_Grade;
    public User(String name, String password, String grade)
    {
        m_Name = name;
        m_Password = password;
        m_Grade = grade;
    }
    public User(){};
    public String getName() {
        return m_Name;
    }
    public void setName(String name) {
        m_Name = name;
    }
    public String getPassword() {
        return m_Password;
    }
    public void setPassword(String password) {
        m_Password = password;
    }
    public String getGrade() {
        return m_Grade;
    }
    public void setGrade(String grade) {
        m_Grade = grade;
    }
}