Msrks insert button

private void insertBtnActionPerformed(java.awt.event.ActionEvent evt)
 {
        if((insertadmntf.getText()).equals(""))
              JOptionPane.showMessageDialog(null,"Invalid Entry!");
        else if((insertexamnameTF.getText()).equals(""))
              JOptionPane.showMessageDialog(null,"Invalid Entry!");
        else{
              try{
                     int admn=Integer.parseInt(updateadmntf.getText());
                    String examname=examnameTF.getText();
                    if((mathstf.getText()).equals(“”)
                                String maths=”null”;
                    else
                                int maths=Integer.parseInt(mathstf.getText());
                    if((physicstf.getText()).equals(“”)
                                String physics=”null”;
                    else
                                int physics=Integer.parseInt(physicstf.getText());
                    if((chemistrytf.getText()).equals(“”)
                                String chemistry=”null”;
                    else
                                int chemistry=Integer.parseInt(chemistrytf.getText());
                    if((iptf.getText()).equals(“”)
                                String ip=”null”;
                    else
                                int ipInteger.parseInt(iptf.getText());
                    if((englishtf.getText()).equals(“”)
                                String english=”null”;
                    else
                                int english=Integer.parseInt(englishtf.getText());
                    if((biologytf.getText()).equals(“”)
                                String biology=”null”;
                    else
                                int biology=Integer.parseInt(biologytf.getText());
                    if((psychologytf.getText()).equals(“”)
                                String psychology=”null”;
                    else
                                int psychology=Integer.parseInt(psychologytf.getText());
                    if((accountancytf.getText()).equals(“”)
                                String accountancy=”null”;
                    else
                                int accountancy=Integer.parseInt(accountancytf.getText());
                    if((businesstf.getText()).equals(“”)
                                String business=”null”;
                    else
                                int business=Integer.parseInt(businesstf.getText());
                    if((economicstf.getText()).equals(“”)
                                String economics=”null”;
                    else
                                int economics=Integer.parseInt(economicstf.getText());
                   Class.forName("java.sql.Driver");
                   Connection con=DriverManager.getConnection
                                          ("jdbc:mysql://localhost/eschool","root","1234");
                   Statement stmt=con.createStatement();
                   String query="insert into results values("+admn+",'"+examname+"',”+maths+”,”+english+”,”+physics+”,”+chemistry+”,”+biology+”,”+ip+”,\”+accountancy+”,”+economics+”,”+psychology+”,”+business+”);";
                   stmt.executeUpdate(query);
                   JoptionPane.showMessageDialog(null,"Marks inserted!");
                   stmt.close();
                   con.close();
                  }
                catch(Exception e)
                  {
                          JoptionPane.showMessageDialog(null,"Server Down.Try again later");
                    }
        }
}