okashii:

So I'm Serializing an Arraylist of ArrayLists essentially but I'm running into an issue. To be honest I'm still pretty new to Java, I've tried so many different methods to fix this as well as searched relentlessly on this site and have not been successful. I know that the way I word things may be hard to follow along or is confusing so I'll post my code here to see. Sorry in advance for all the code. SuperUsers has an arraylist of LoginInfo, PasswordKeeper has an Arraylist of SuperUsers, and the SuperUser arraylist gets serialized in PasswordKeeper. but any changes made to the LoginInfo arraylist do not save and i cannot figure out why. If anyone can help I would really Appreciate it. Thanks

public class PasswordKeeper{

    private ArrayList users;
    private static Scanner keyboard = new Scanner(System.in);

    public PasswordKeeper() {
        users = new ArrayList();
    }

    public void login() {
        try {
            // reads in SuperUser arraylist
            get();
        } catch (EOFException a) {
            System.out.println("You are the First User!");
        } catch (IOException b) {
            System.out.println(b);
        } catch (ClassNotFoundException c) {
            System.out.println(c);
        }
        boolean loopDisplay = true;
        while (loopDisplay) {
                existingUser = keyboard.next();
                existingPass = keyboard.next();
                SuperUser temp = new SuperUser(existingUser, existingPass);
                System.out.println();
                if (users.contains(temp)) {

                    // viewing superUser method
                    temp.display();
                    //saves after method call is over
                    try {
                        System.out.println("Saving.");
                        save(users);
                    } catch (IOException e) {
                        System.out.println(e);
                    }
                }
            }
        }
    }
    //serializable methods
    public void save(ArrayList obj) throws IOException {

        File file = new File("userInformation.dat");
        FileOutputStream fileOut = new FileOutputStream(file, false);
        BufferedOutputStream buffedOutput = new BufferedOutputStream(fileOut);
        ObjectOutputStream out = new ObjectOutputStream(buffedOutput);
        out.writeObject(obj);
        out.close();
        fileOut.close();
    }

    public ArrayList get() throws IOException, ClassNotFoundException {
        FileInputStream fileIn = new FileInputStream("userInformation.dat");
        BufferedInputStream buffedInput = new BufferedInputStream(fileIn);
        ObjectInputStream in = new ObjectInputStream(buffedInput);
        users = (ArrayList) in.readObject();
        in.close();
        fileIn.close();
        return users;
    }

    public class SuperUser implements Serializable {
        private String userName;
        private String password;
        private static Scanner keyboard = new Scanner(System.in);
        private ArrayList info = new ArrayList();

        public SuperUser(String name, String pass) {
            userName = name;
            password = pass;
        }

        public String getUser() {
            return userName;
        }

        public void display() {

            String next = keyboard.next();
            //want to add data to LoginInfo arraylist
            if (next.equalsIgnoreCase("add")) {
                add();
            } else if (next.equalsIgnoreCase("delete")) {
                delete();
            } else if (numberCheck(next)) {
                int choice = (int) Integer.parseInt(next) - 1;
                edit(choice);
            //!!!! this: after doing this i lose whatever data i added
            //to the LoginInfo arraylist, right after this the
            //SuperUser arraylist gets saved. but the added data to 
            //loginInfo does not
            } else if (next.equalsIgnoreCase("logout")) {
                System.out.println(info.size());
            }
        }

        public boolean numberCheck(String in) {
            try {
                Integer.parseInt(in);
            } catch (NumberFormatException e) {
                return false;
            }
            return true;
        }
        //method to add to the Arraylist
        public void add() {
            System.out.println("What is the website name?:");
            String trash = keyboard.nextLine();
            String webName = keyboard.nextLine();
            System.out.println("The Username?:");
            String webUsername = keyboard.nextLine();
            System.out.println("The Password?:");
            String webPass = keyboard.nextLine();
            info.add(new LoginInfo(webUsername, webPass, webName));
            System.out.println(info.size());
            //method goes back to display
            display();
        }
    }
}