public void addingAdministration() {

            System.out.println(administration.size());
            System.out.println("Podaj imie:");
            String a = geting.nextLine();
            System.out.println("Podaj nazwisko:");
            String b = geting.nextLine();
            System.out.println("Podaj wiek:");
            try {
                int c = geting.nextInt();
                System.out.println("Podaj PESEL:");
                int d = geting.nextInt();
                System.out.println("Podaj wypłate:");
                int e = geting.nextInt();
                System.out.println("Podaj ilość rozwiązanych spraw:");
                int f = geting.nextInt();

                administration.add(new PracownikAdministracyjny(a, b, c, d, e, f));

            } catch (InputMismatchException e) {
                System.out.println("Należy podawać liczby.");
            }

                //Serializacja
            try {
                System.out.println(administration.get(administration.size()-1).name);
                System.out.println(administration.get(administration.size()-1).lastName);
                System.out.println(administration.get(administration.size()-1).age);
                System.out.println(administration.size());
                FileOutputStream file = new FileOutputStream("Administration.ser");
                ObjectOutputStream out = new ObjectOutputStream(file);
                out.writeObject(administration);
                out.close();
                file.close();

                System.out.println("New admin has been added");

            }
            catch (IOException ex) {
                System.out.println(ex.getCause());
                System.out.println(ex.getMessage());
            }
            //Deserializacja
            try {

                FileInputStream file = new FileInputStream("Administration.ser");
                ObjectInputStream in = new ObjectInputStream(file);


                administration = (ArrayList) in.readObject();
                in.close();
                file.close();

                System.out.println("Object has been deserialized >> ROZMIAR:");
                System.out.println(administration.size());
                System.out.println("wszyscy");
                for(int i=0; i<administration.size(); i++){
                    System.out.println("Czlowiek nr "+ (i+1));
                    System.out.println(administration.get(i).name);
                    System.out.println(administration.get(i).lastName);
                    System.out.println(administration.get(i).age);
                    System.out.println(administration.get(i).salary);
                }

            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
        }