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 public void saveToFile()    {      try {            fos= new FileOutputStream("database.txt"); //create output stream            oos = new ObjectOutputStream(fos);  //create object writing to stream            oos.writeObject(people); //serialie object          } catch (FileNotFoundException e)           {            e.printStackTrace();          } catch (IOException e)           {            e.printStackTrace();          }           finally           {            try             {             if (oos != null) oos.close();            } catch (IOException e) {}            try            {             if (fos != null) fos.close();            } catch (IOException e) {}          }          }