Method orElse

streams/Optionals.java:19–21

(Optional<String> optString)

    optString.ifPresent(System.out::println);
  }
  static void orElse(Optional<String> optString) {
    System.out.println(optString.orElse("Nada"));
  }
  static void orElseGet(Optional<String> optString) {
    System.out.println(
      optString.orElseGet(() -> "Generated"));