Method of

src/test/java/io/socket/util/Optional.java:11–16

(T value)

    private T value;

    public static <T> Optional<T> of(T value) {
        if (value == null) {
            throw new NullPointerException();
        }
        return new Optional<>(value);
    }

    public static <T> Optional<T> ofNullable(T value) {
        return new Optional<>(value);