In Java, LinkedBlockingDeque is an implementation of the BlockingDeque interface that provides a thread-safe implementation of a double-ended queue. The LinkedBlockingDeque is a bounded queue that can hold a maximum number of elements at any given time. When the queue is full, any attempt to add an element to the queue will block until space becomes available.

Here is an example of how to use LinkedBlockingDeque in Java:

LinkedBlockingDeque<String> deque = new LinkedBlockingDeque<>(10);

deque.addFirst("first");
deque.addLast("last");

String first = deque.takeFirst();
String last = deque.takeLast();

In this example, we create a LinkedBlockingDeque with a capacity of 10 elements. We then add elements to the queue using the addFirst() and addLast() methods. When we want to remove elements from the queue, we use the takeFirst() and takeLast() methods, which will block until an element is available.

LinkedBlockingDeque provides several methods for adding and removing elements from the queue, as well as methods for inspecting the elements in the queue. It also provides methods for iterating over the elements in the queue, and for converting the queue to an array.

Since LinkedBlockingDeque is thread-safe, it can be used in multi-threaded environments where multiple threads may need to access the same queue concurrently. However, care should be taken to ensure that the proper synchronization mechanisms are used to prevent race conditions and other concurrency issues.