java - What is the algorithmic runtime of the removeFirst() method in a LinkedList? -

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OK, so I know that a lot about the cost of various tasks on archive Good threads> gives a great overview of the difference between the interface ArrayList and LinkedList . But after reading that thread, I'm still unsure of one thing: removeFirst () / pollFirst () and removeLast () / pollLast () have algorithm runtime O (1) Or do I have to use Iterator to get it?

If you will see:

Perform all the tasks, Which can be expected for a double-linked list.

Then remove the head or tail o (1).


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