Method test

streams/Optionals.java:34–39

(String testName,
    Consumer<Optional<String>> cos)

    }
  }
  static void test(String testName,
    Consumer<Optional<String>> cos) {
    System.out.println(" === " + testName + " === ");
    cos.accept(Stream.of("Epithets").findFirst());
    cos.accept(Stream.<String>empty().findFirst());
  }
  public static void main(String[] args) {
    test("basics", Optionals::basics);
    test("ifPresent", Optionals::ifPresent);