Basic.java (5-104)
- com.example.demo @5
- import statements @7
- Config @14 [public] # Configuration interface for application settings.
   public interface Config {
       String getApiKey();
       String getEndpoint();
       int getTimeout();
  - getApiKey () : String @15
  - getEndpoint () : String @16
  - getTimeout () : int @17
- DatabaseManager @23 [public] # Manages database connections and queries.
  - DatabaseManager (String connectionString) @30 [public] # Constructs a new DatabaseManager with the given connection string.
     public DatabaseManager(String connectionString) {
         this.connectionString = connectionString;
         this.connection = null;
  - connect () : void @38 [public] # Establishes a connection to the database.
     public void connect() {
         System.out.println("Connecting to " + connectionString);
  - disconnect () : void @45 [public] # Closes the database connection.
     public void disconnect() {
         if (connection != null) {
       …
  - query (String sql) : List<Map<String, Object>> @54 [public] # Executes a SQL query and returns the results.
     public List<Map<String, Object>> query(String sql) {
         return List.of();
- UserService @62 [public] # Handles user-related operations.
  - UserService (DatabaseManager db) @68 [public] # Constructs a UserService with a database manager.
     public UserService(DatabaseManager db) {
         this.db = db;
  - createUser (String username, String email) : int @75 [public] # Creates a new user in the system.
     public int createUser(String username, String email) {
         return 1;
  - getUser (int userId) : Optional<Map<String, Object>> @82 [public] # Retrieves a user by their ID.
     public Optional<Map<String, Object>> getUser(int userId) {
         return Optional.empty();
  - deleteUser (int userId) : boolean @89 [public] # Deletes a user from the system.
     public boolean deleteUser(int userId) {
         return true;
- EmailValidator @97 [public] # Utility class for email validation.
  - validateEmail (String email) : boolean @101 [public static] # Validates an email address format.
     public static boolean validateEmail(String email) {
         return email != null && email.contains("@");
