rahdi

private void buttonTambah_akhmadActionPerformed(java.awt.event.ActionEvent evt) {
        try {
            Connection cn = DriverManager.getConnection
            ("jdbc:mysql://localhost/db_uas_akhmad","root","");
            cn.createStatement().executeUpdate
            ("insert into tb_nilai values "+"('"+nama_akhmad.getText()
                +"','"+tugas_akhmad.getText()+"','"+uts_akhmad.getText()+"','"+uas_akhmad.getText()+"')");
            tampilkan();
        } catch (SQLException ex) {
            JOptionPane.showMessageDialog(null, "Ada data yang belum diisi !!");
        }
        reset();
    }