Thread: How to save an updated JList to a text file after the GUI closes?

I am writing code for a simple email sender with a contact list GUI (using JList) that pops up when you click to TO: button in the email GUI. The contact list GUI allows the user to select a contact to send an email to, and it also allows the user to delete or add contacts to the list. I cannot figure out how to update the contacts.txt list after the person is done updating the contacts. I want the text file to update after the user exits the contact list GUI.

my code for adding the contacts.txt file

 
    public void setUpContactList() { //sets up the contact list from the contacts.txt file
        addressBook = new ContactList();
        try {
            Scanner scanFile = new Scanner(new File("contacts.txt"));
            while(scanFile.hasNext()) {
				String contactInformation = scanFile.nextLine(); //split by contact
				Scanner contactScanner = new Scanner(contactInformation);
                String info = contactScanner.next();
                String first = "";
                String last = "";
                String email = "";
                if(info.contains("@")) {
                email = info;
                }
                else {
                    first = info;
                    last = contactScanner.next();
                    email = contactScanner.next();
                }
				Contact contactA = new Contact(first, last, email);
                addressBook.add(contactA);
        }
        }
        catch(FileNotFoundException e) {}

my code to update the listwhere I am lost)

        public saveFile() {
		if WindowClosing is pressed{
			UpdateContact file=new UpdateContact file();
 
 
    }

my code where the GUI closes.

    public void windowClosing(WindowEvent arg0) {
                        toField.setText(toField.getText().concat(clUI.getRecipients()));
                        saveFile();
                }

Sorry if I formatted this question wrong, this is the first time I have used stackoverflow. Any help is appreciated.

Originally Posted by Norm

can you explain what the problem is?
Are you able to write to the file?
Can you get the data that you want to write to the file?
Can you execute the code to write the file when you want to do the wrigint?

I have a GUI where you can edit and remove contacts. Once you exit the GUI I want the contacts to update in the next file. I have a text file created, but it's not updating the contacts.

Contacts is a list created with a jlist. It is in a dialog box that opens in an email program. The contacts are added to a text file once the user edits the contacts with a jlist. The problem is that it loads the contact information from a text file contacts.txt but it does not add or remove contacts when the user changes it in the jlist GUI.

I'm sorry if I am not being clear. There is a contact list GUI that reads the name and emails from a text file. It loads the contacts from the file. But when te user presses add or remove contact, it does not change the contact list in the text file. I want it to say something like if remove is pressed remove certain contact. If save is pressed add new contact to text file.

Thank you for your help. I figured it out.