Note2

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

class Note implements Serializable {
    private static final long serialVersionUID = 1L;

    private String title;
    private String content;

    public Note(String title, String content) {
        this.title = title;
        this.content = content;
    }

    public String getTitle() {
        return title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String newContent) {
        content = newContent;
    }

    @Override
    public String toString() {
        return "Title: " + title + "\nContent: " + content;
    }
}

class NoteTaker implements Serializable {
    private static final long serialVersionUID = 1L;

    private List<Note> notes;

    public NoteTaker() {
        notes = new ArrayList<>();
    }

    public void addNote(String title, String content) {
        Note newNote = new Note(title, content);
        notes.add(newNote);
        System.out.println("Note added:\n" + newNote);
    }

    public void editNote(int index, String newContent) {
        if (index >= 0 && index < notes.size()) {
            Note note = notes.get(index);
            note.setContent(newContent);
            System.out.println("Note edited:\n" + note);
        } else {
            System.out.println("Invalid note index.");
        }
    }

    public void displayNotes() {
        if (notes.isEmpty()) {
            System.out.println("No notes found.");
        } else {
            System.out.println("Notes:");
            for (int i = 0; i < notes.size(); i++) {
                System.out.println((i + 1) + ". " + notes.get(i));
            }
        }
    }

    public void saveNotesToFile(String filename) {
        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(filename))) {
            oos.writeObject(this);
            System.out.println("Note data saved to file: " + filename);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static NoteTaker loadNotesFromFile(String filename) {
        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(filename))) {
            return (NoteTaker) ois.readObject();
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
            return new NoteTaker(); // If an error occurs, return a new note taker instance
        }
    }
}

public class NoteTakerApp {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        NoteTaker noteTaker = new NoteTaker();

        // Load note data from file (if the file exists)
        noteTaker = NoteTaker.loadNotesFromFile("notes.dat");

        while (true) {
            System.out.println("\nChoose an action:");
            System.out.println("1. Add Note");
            System.out.println("2. Edit Note");
            System.out.println("3. View Notes");
            System.out.println("4. Save Note Data to File");
            System.out.println("5. Exit");

            int choice = scanner.nextInt();
            scanner.nextLine(); // Clear buffer

            switch (choice) {
                case 1:
                    System.out.println("Enter note title:");
                    String title = scanner.nextLine();
                    System.out.println("Enter note content:");
                    String content = scanner.nextLine();
                    noteTaker.addNote(title, content);
                    break;
                case 2:
                    System.out.println("Enter note index to edit:");
                    int noteIndex = scanner.nextInt();
                    scanner.nextLine(); // Clear buffer
                    System.out.println("Enter new note content:");
                    String newContent = scanner.nextLine();
                    noteTaker.editNote(noteIndex - 1, newContent);
                    break;
                case 3:
                    noteTaker.displayNotes();
                    break;
                case 4:
                    noteTaker.saveNotesToFile("notes.dat");
                    break;
                case 5:
                    System.out.println("Exiting the Note Taker. Goodbye!");
                    System.exit(0);
                default:
                    System.out.println("Invalid choice. Please choose again.");
            }
        }
    }
}