ConcurrentLinkedDeque vs LinkedBlockingDeque

Question

I need to have a thread-safe LIFO structure and found that I can use thread-safe implementations of Deque for this. Java 7 has introduced ConcurrentLinkedDeque and

Answer 1

ConcurentLinkedDequeue is lock-free (see comments in source code) while LinkedBlockingQueue uses locking. That is the former is supposed to be more efficient