NotesApp.java

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

public class NotesApp {
    private static final String FILE_NAME = "notes.txt";

    // Method to write notes (append mode)
    public static void writeNote(String note) {
        try (FileWriter writer = new FileWriter(FILE_NAME, true)) { // true = append mode
            writer.write(note + System.lineSeparator());
            System.out.println("✅ Note saved successfully!");
        } catch (IOException e) {
            System.out.println("❌ Error writing to file: " + e.getMessage());
        }
    }

    // Method to read all notes
    public static void readNotes() {
        try (BufferedReader reader = new BufferedReader(new FileReader(FILE_NAME))) {
            String line;
            System.out.println("\n📒 Your Notes:");
            while ((line = reader.readLine()) != null) {
                System.out.println("- " + line);
            }
        } catch (FileNotFoundException e) {
            System.out.println("⚠ No notes found yet. Please add a note first.");
        } catch (IOException e) {
            System.out.println("❌ Error reading from file: " + e.getMessage());
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int choice;

        do {
            System.out.println("\n==== Notes App ====");
            System.out.println("1. Add Note");
            System.out.println("2. View Notes");
            System.out.println("3. Exit");
            System.out.print("Enter your choice: ");

            choice = scanner.nextInt();
            scanner.nextLine(); // consume newline

            switch (choice) {
                case 1:
                    System.out.print("Enter your note: ");
                    String note = scanner.nextLine();
                    writeNote(note);
                    break;
                case 2:
                    readNotes();
                    break;
                case 3:
                    System.out.println("👋 Exiting Notes App. Goodbye!");
                    break;
                default:
                    System.out.println("❌ Invalid choice. Try again.");
            }
        } while (choice != 3);

        scanner.close();
    }
}