private void btnSimpanActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnSimpanActionPerformed
        // TODO add your handling code here:
        if (txtNoPol.getText().isEmpty()) {
            JOptionPane.showMessageDialog(this, "Nomor polisi belum diisi!");
        } else if (cbJenis.getSelectedItem().equals("-Pilih Jenis Kendaraan-")) {
            JOptionPane.showMessageDialog(this, "Jenis kendaraan belum dipilih");
        } else {
            String nopol, jenis, sql;
            nopol = txtNoPol.getText();
            jenis = cbJenis.getSelectedItem().toString();

            sql = "INSERT INTO tb_parkir(no_pol,jenis,tgl_masuk,jam_masuk)"
                    + "VALUES('"+nopol+"','"+jenis+"',CURDATE(),CURTIME())";
            try{
                konek.st = konek.conn.createStatement();
                konek.st.execute(sql);
            }
            catch (SQLException e){
                JOptionPane.showMessageDialog(this, "Data gagal disimpan"+e);
                return;
            }
            JOptionPane.showMessageDialog(this, "Data berhasil disimpan");
        }
        resetAll();
        tampil_masuk();
        tampil_keluar();
    }//GEN-LAST:event_btnSimpanActionPerformed