import java.io.Serializable;
    public class contactInfo implements Serializable {
    private static final long serialVersionUID = 1L;
    private String firstNameField;
    private String LastNameField;
    private String phoneNum1Field;
    private String phoneNum2Field;
    private String dobField;
    private String addressField;
    private String notesField;
   //every variables has getters and setters.
}

@FXML
    private ListView<String> listView_Contact;

    private final ObservableList<String> myContactList = FXCollections.observableArrayList();

public void saveContents() throws IOException, FileNotFoundException {
        String filename = "pipdata.txt";
        File contactListdata = new File(filename);
        FileOutputStream file = new FileOutputStream(contactListdata, true);
            myContact.setFirstNameField(firstNameTBox_Contact.getText());
            myContact.setLastNameField(lastNameTBox_Contact.getText());
            myContact.setPhoneNum1Field(phoneNum1TBox_Contact.getText());
            myContact.setPhoneNum2Field(phoneNum2TBox_Contact.getText());
            myContact.setDobField(birthdayTBox_Contact.getText());
            myContact.setAddressField(homeAddressTBox_Contact.getText());
            myContact.setNotesField(notesTBox_Contact.getText());
            addToListView();
    try {

                ObjectOutputStream out = new ObjectOutputStream(file);
         out.writeObject(myContact);
                out.writeObject(new ArrayList<>(myContactList));
                out.close();
                file.close();
    } catch (FileNotFoundException o) {
                System.out.println("File not Found");
            }
        }
    }

public void loadContents() throws IOException, ClassNotFoundException {
try {
    FileInputStream file = new FileInputStream("pipdata.txt");
    ObjectInputStream ob = new ObjectInputStream(file);
    myContact = (contactInfo) ob.readObject();
    myContactList.setAll((ArrayList<String>) ob.readObject());
    ob.close();
    file.close();
} catch (FileNotFoundException ex) {
        Logger.getLogger(ContactController.class.getName()).log(Level.SEVERE, null, ex);

}
}

public void itemSeleted(){
        listView_Contact.getSelectionModel().selectedItemProperty()
                .addListener(new ChangeListener<String>() {
    @Override
    public void changed(

            ObservableValue<? extends String> observable,
            String oldValue, String newValue) {
            firstNameTBox_Contact.setText(myContact.getFirstNameField());
            lastNameTBox_Contact.setText(myContact.getLastNameField());
            phoneNum1TBox_Contact.setText(myContact.getPhoneNum1Field());
            phoneNum2TBox_Contact.setText(myContact.getPhoneNum2Field());
            birthdayTBox_Contact.setText(myContact.getDobField());
            homeAddressTBox_Contact.setText(myContact.getAddressField());
            notesTBox_Contact.setText(myContact.getNotesField());
        }
     });
   }

@Override
    public void initialize(URL url, ResourceBundle rb) {
        try {
            listView_Contact.setItems(myContactList);
            loadContents();
           // itemSeleted();
        } catch (IOException | ClassNotFoundException ex) {
            Logger.getLogger(ContactController.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}