///Populate jComboBox
private void FillCombo(){
        String sql = "Select ID_osoba, Ime, Prezime from osoba";
        try{
            pst = conn.prepareStatement(sql);
            rs = pst.executeQuery();
            while (rs.next()){
                String nme = rs.getString("Ime");
                String gg = rs.getString("ID_osoba");
                String ggg = rs.getString("Prezime");
                int gggg = rs.getInt("ID_osoba");
                jComboBox1.addItem(gggg +"."+" "+" "+ nme +" "+ ggg);
            }
        }
            catch(Exception e){
                JOptionPane.showMessageDialog(null, e);
        }
    }
///Insert into database
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    conn = Connect.ConnectDB();

        String sql = "INSERT INTO adresa (Naziv_ulice, Br_ulice, ID_Osoba_FK, Id_grad_FK) VALUES ('"+ULICA.getText()+"','"+BROJUL.getText()+"','"+jComboBox1.getSelectedObjects()+"','"+jComboBox2.getItemAt(WIDTH) +"')" ;
        try{
            pst = conn.prepareStatement(sql);
            pst.execute();
            JOptionPane.showMessageDialog(null, "Saved");

            UpdateJTable();
            //conn.close();
        }
        catch(Exception e){
            JOptionPane.showMessageDialog(null, e);
        }
}