public final class Example {
    // * To create a configuration annotate a class with @Configuration and make sure that
    //   it has a no-args constructor.
    // * Now add fields to that class and assign them default values.
    // * That's it! Fields can be private; setters are not required.
    @Configuration
    public static class BaseConfiguration {
        private String host = "127.0.0.1";
        private int port = 1234;
        // The library supports lists, sets, and maps.
        private Set<String> blockedAddresses = Set.of("8.8.8.8");
        // Fields can be ignored by making them final, transient, static or by
        // annotating them with @Ignore.
        private final double ignoreMe = 3.14;
    }

    // This library supports records; no @Configuration annotation required
    public record User(
            String username,
            @Comment("Please choose a strong password.")
            String password
    ) {}

    // Subclassing of configurations and nesting of configurations in other configurations
    // is also supported. Subclasses don't need to be annotated again.
    public static final class UserConfiguration extends BaseConfiguration {
        // You can add comments with the @Comment annotation. Each string in the comment
        // array is written (as a comment) on a new line.
        @Comment({"The admin user has full access.", "Choose a proper password!"})
        User admin = new User("root", "toor"); // The User class is a record!
        List<User> blockedUsers = List.of(
                new User("user1", null), // null values are supported
                new User("user2", null)
        );
    }

    public static void main(String[] args) {
        var configFile = Paths.get("/tmp/config.yml");
        var config = new UserConfiguration();

        // Save a new instance to the configuration file
        YamlConfigurations.save(configFile, UserConfiguration.class, config);

        // Load a new instance from the configuration file
        config = YamlConfigurations.load(configFile, UserConfiguration.class);
        System.out.println(config.admin.username);
        System.out.println(config.blockedUsers);

        // Modify and save the configuration file
        config.blockedUsers.add(new User("user3", "pass3"));
        YamlConfigurations.save(configFile, UserConfiguration.class, config);
    }
}