NotesApp.java

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

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

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

        do {
            System.out.println("\n--- Simple Notes App ---");
            System.out.println("1. Write a new note");
            System.out.println("2. View all notes");
            System.out.println("3. Exit");
            System.out.print("Enter your choice: ");

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

            switch (choice) {
                case 1:
                    writeNote(scanner);
                    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();
    }

    private static void writeNote(Scanner scanner) {
        try {
            FileWriter writer = new FileWriter(FILE_NAME, true); // append mode
            System.out.print("Enter your note: ");
            String note = scanner.nextLine();
            writer.write(note + "\n");
            writer.close();
            System.out.println("Note saved successfully.");
        } catch (IOException e) {
            System.out.println("Error writing note: " + e.getMessage());
        }
    }

    private static void readNotes() {
        try {
            File file = new File(FILE_NAME);
            if (!file.exists()) {
                System.out.println("No notes found.");
                return;
            }

            BufferedReader reader = new BufferedReader(new FileReader(file));
            String line;
            System.out.println("\n--- Your Notes ---");
            while ((line = reader.readLine()) != null) {
                System.out.println("- " + line);
            }
            reader.close();
        } catch (IOException e) {
            System.out.println("Error reading notes: " + e.getMessage());
        }
    }
}