Object[] toArray()
Returns an array containing all of the elements in this list in proper sequence (from first to last element).
T[] toArray(T[] a)
Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
Because LinkedList implements the Deque interface, you have access to the methods defined by Deque.
For example,
To add elements to the start of a list you can use addFirst( ) or offerFirst( ).
To add elements to the end of the list, use addLast( ) or offerLast( ).
To obtain the first element, you can use getFirst( ) or peekFirst( ).
To obtain the last element, use getLast( ) or peekLast( ).
To remove the first element, use removeFirst( ) or pollFirst( ).
To remove the last element, use removeLast( ) or pollLast( ).