The java.util.concurrent.ConcurrentLinkedDeque.pollFirst() is an in-built method in Java which retrieves the first element of this deque and removes it. If the deque is empty, the method returns NULL.
Parameters: This function does not accepts any parameter.
Return Values: The function returns the first element of this deque. If this deque is empty, the function returns NULL.
Below program illustrates the use of pollFirst() method:
Program 1: This program involves deque with Integer elements.
Elements inthe LinkedDeque: [475, 1009, 70, 12] Element removed : 475 Elements inthe LinkedDeque: [1009, 70, 12]
Program 2: This program involves deque with String elements.
Elements inthe LinkedDeque: [Geeks, Gfg, Geeks, GFG] Element removed : Geeks Elements inthe LinkedDeque: [Gfg, Geeks, GFG]
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