数据库中的函数不能在另一个类java中的任何地方使用

Question

我正在尝试一个java和microsoft访问项目，我在其中进行调查并将结果上传到数据库。 GUI工作，我现在的问题是将数据插入数据库表。

我的主要问题是我无法在任何地方使用StudentAdd函数而无法获得＆＃34;无法从UseDataBase类型对非静态方法StudentAdd进行静态引用。＆＃34;

感谢任何帮助。下面上传了类（我将省略导入，我保留所有这些，我保证）。

调查班的重要部分：

Button button_1 = new Button("Finish");
    button_1.addActionListener(new ActionListener() 
    {

        public void actionPerformed(ActionEvent arg0)//to send stuff to DB 
        {
            int Button = JOptionPane.YES_NO_OPTION;
            int option = JOptionPane.showConfirmDialog(frame, "Your data has been uploaded \n Yes to repeat the surrvey for a new class \n No to exit", "Repeat the surver?", Button);
            if(option == JOptionPane.YES_OPTION) 
            {
                frame.setVisible(true);
                connecting("stable");
            }
            else 
            {
                frame.setVisible(false);
            }
            //This line gives the error:
            UseDataBase.StudentAdd (fname, lname, grade, subject, lvl, hw);
        }

    });
    button_1.setBounds(263, 392, 116, 29);
    frame.getContentPane().add(button_1);

数据库类：

public class DataBase 
{
    private Connection connect;
    public DataBase(String name)
    {
        try// tries to connect to db
        {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            connect = DriverManager.getConnection("jdbc:odbc:DRIVER ={Microsoft Access Driver (*.mdb)};DBQ ="+name+".mdb");
            System.out.println("Connected");
        }
        catch(Exception e)// if cannot connect then
        {
            System.out.println("Unable to connect!");
        }
    }
    ResultSet queryTbl(String sql) throws SQLException
    {
        Statement statement = connect.createStatement();
        ResultSet rs = statement.executeQuery(sql);
        return rs;
    }

    public void update(String sql) throws SQLException
    {
        Statement statement = connect.createStatement();
        statement.executeUpdate(sql);
        statement.close();
    }

} 

UseDB Class：

public class UseDataBase 
{
    DataBase surveyDB = new DataBase("Survey");

    public void main (String [] args) throws SQLException
    {
        new UseDataBase ();
    }

    //Function I am calling
    void StudentAdd (String fname, String lname, int grade, String subject, String lvl, String hw) throws SQLException
    {
        surveyDB.update("INSERT INTO stable (Name, Surname, Grade, Subject, Level, Homework Hours)VALUES('"+fname+"','"+ lname+"','"+ grade+"','" +subject+"','" +lvl+"','"+ hw+"')");
    }