@J2ktIncompatible
  @GwtIncompatible // PriorityBlockingQueue
  public static <E extends Comparable> PriorityBlockingQueue<E> newPriorityBlockingQueue(
      Iterable<? extends E> elements) {
    if (elements instanceof Collection) {
      return new PriorityBlockingQueue<>((Collection<? extends E>) elements);
    }
    PriorityBlockingQueue<E> queue = new PriorityBlockingQueue<>();
    Iterables.addAll(queue, elements);

        return new LinkedList<>(c);
    }

    /**
     * {@link PriorityBlockingQueue}の新しいインスタンスを作成して返します。
     *
     * @param <E>
     *            {@link PriorityBlockingQueue}の要素型
     * @return {@link PriorityBlockingQueue}の新しいインスタンス
     * @see PriorityBlockingQueue#PriorityBlockingQueue()
     */
    public static <E> PriorityBlockingQueue<E> newPriorityBlockingQueue() {
        return new PriorityBlockingQueue<>();