NotesApp.java

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

class Note {
    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 content) {
        this.content = content;
    }

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

public class NotesApp {
    private static ArrayList<Note> notes = new ArrayList<>();
    private static final String FILENAME = "notes.txt"; // File to save notes
    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        loadNotes(); // Load saved notes from the file

        while (true) {
            displayMenu();
            int choice = scanner.nextInt();
            scanner.nextLine();  // Consume newline character

            switch (choice) {
                case 1:
                    createNote();
                    break;
                case 2:
                    viewNotes();
                    break;
                case 3:
                    editNote();
                    break;
                case 4:
                    deleteNote();
                    break;
                case 5:
                    saveNotes(); // Save notes to the file
                    System.out.println("Goodbye!");
                    System.exit(0);
                default:
                    System.out.println("Invalid choice. Please try again.");
            }
        }
    }

    private static void displayMenu() {
        System.out.println("\nNotes Keeping App");
        System.out.println("1. Create a new note");
        System.out.println("2. View saved notes");
        System.out.println("3. Edit a note");
        System.out.println("4. Delete a note");
        System.out.println("5. Exit");
        System.out.print("Enter your choice: ");
    }

    private static void loadNotes() {
        try (BufferedReader reader = new BufferedReader(new FileReader(FILENAME))) {
            String line;
            while ((line = reader.readLine()) != null) {
                String[] parts = line.split("\\|");
                if (parts.length == 2) {
                    notes.add(new Note(parts[0], parts[1]));
                }
            }
        } catch (IOException e) {
            // Handle file loading errors, or create the file if it doesn't exist
            System.out.println("No previous notes found, starting fresh.");
        }
    }

    private static void saveNotes() {
        try (PrintWriter writer = new PrintWriter(new FileWriter(FILENAME))) {
            for (Note note : notes) {
                writer.println(note.getTitle() + "|" + note.getContent());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void createNote() {
        System.out.print("Enter the title of the note: ");
        String title = scanner.nextLine();
        System.out.print("Enter the content of the note: ");
        String content = scanner.nextLine();
        notes.add(new Note(title, content));
        System.out.println("Note created successfully!");
    }

    private static void viewNotes() {
        if (notes.isEmpty()) {
            System.out.println("No notes available.");
        } else {
            for (int i = 0; i < notes.size(); i++) {
                System.out.println("\nNote " + (i + 1) + ":");
                System.out.println(notes.get(i));
            }
        }
    }

    private static void editNote() {
        viewNotes();
        System.out.print("Enter the note number to edit: ");
        int noteNumber = scanner.nextInt();
        scanner.nextLine(); // Consume newline character

        if (noteNumber < 1 || noteNumber > notes.size()) {
            System.out.println("Invalid note number.");
            return;
        }

        Note note = notes.get(noteNumber - 1);
        System.out.print("Enter new content for the note (current content: " + note.getContent() + "): ");
        String newContent = scanner.nextLine();
        note.setContent(newContent);
        System.out.println("Note updated successfully!");
    }

    private static void deleteNote() {
        viewNotes();
        System.out.print("Enter the note number to delete: ");
        int noteNumber = scanner.nextInt();
        scanner.nextLine(); // Consume newline character

        if (noteNumber < 1 || noteNumber > notes.size()) {
            System.out.println("Invalid note number.");
            return;
        }

        notes.remove(noteNumber - 1);
        System.out.println("Note deleted successfully!");
    }
}