java - 数字格式异常: null

Question

我在数据库中使用以下数据类型。

但是我得到了异常作为异常:

in thread "Thread-2" java.lang.NumberFormatException: null

如何解决

btn.addActionListener(new ActionListener()
{
    Thread thread= new Thread()
    {
        public void run()
        { 
            Connection con= conn.getconnection();
            get_data();
            String Query = " INSERT INTO employees (Id,
                                P_F_No,
                                Name,
                                Date,
                                Guard/LP/ALP,
                                Incomming_Train,
                                Sign_off,
                                Room_Bed_No,
                                Out_going_train_time,
                                Sign_on,
                                subisezed_meal)
                                VALUES
                                (?,?,?,?,?,?,?,?,?,?,?)";

            try
            {
                PreparedStatement pr = con.prepareStatement(Query);
                pr.setString(1,data[0]);
                pr.setInt(2,Integer.parseInt(data[1]));
                pr.setString(3,data[2]);
                pr.setDate(4,Date.valueOf(data[3]));
                pr.setString(5,data[4]);
                pr.setTime(6,Time.valueOf(data[5]));
                pr.setTime(7,Time.valueOf(data[6]));
                pr.setString(8,data[7]);
                pr.setTime(9,Time.valueOf(data[8]));
                pr.setTime(10,Time.valueOf(data[9]));
                pr.setString(11,data[10]);
                pr.executeUpdate();
            }
            catch (SQLException ex)
            {
                System.out.println(ex);
            }
        }
    };

    thread.start();
});

Answer 1

这一行:

pr.setInt(2,Integer.parseInt(data[1]));

对 null 值调用 parseInt 将导致出现 NumberFormatException，data[1] 将为 null。