Method testStream

streams/OptionalFlatMap.java:11–13

()

class OptionalFlatMap {
  static String[] elements = { "12", "", "23", "45" };
  static Stream<String> testStream() {
    return Arrays.stream(elements);
  }
  static void test(String descr,
    Function<String, Optional<String>> func) {
    System.out.println(" ---( " + descr + " )---");