Lesson3_Part3.java

  static List<String> processWords(List<String> wordList, boolean parallel) {

    Supplier<Stream<String>> streamSupplier = parallel ? wordList::parallelStream : wordList::stream;

    return
      streamSupplier.get()
        .sorted()
        .map(String::toLowerCase)
        .map(String::toUpperCase)
        .filter(word -> !word.startsWith("a"))
        .filter(word -> !word.startsWith("A"))
        .filter(word -> !word.startsWith("z"))
        .filter(word -> !word.startsWith("Z"))
        .filter(word -> !word.startsWith("m"))
        .filter(word -> !word.startsWith("M"))
        .distinct()
        .collect(Collectors.toList());
  }