public class Conn {
private Connection conn = null;


public Connection getConn() throws ClassNotFoundException
{
    try{
        Class.forName("com.mysql.jdbc.Driver");
        conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/bloodbank","root","");

    }catch(SQLException e){
        System.out.println(e);
    }

    return conn;
}

public void read() throws ClassNotFoundException, SQLException{

    readForm r = new readForm();
    PreparedStatement st;
    Connection con = getConn();
    ResultSet rs;

    String query = "SELECT * FROM patients";
        try {
            st = con.prepareStatement(query);
            rs = st.executeQuery();
            DefaultTableModel tm = (DefaultTableModel)r.table.getModel();
            tm.setRowCount(0);
            Object row[] = new Object[5];
            for(Patients u : list){
                row[0] = u.getId();
                row[1] = u.getfName();
                row[2] = u.getlName();
                row[3] = u.getGender();
                row[4] = u.getAge();
                tm.addRow(row);
            }
            r.setVisible(true);
        } catch (SQLException e) {
            System.out.println(e);
        }
}