Java poll()

In Java, the poll() method of a queue retrieves and removes the head element, or returns null if the queue is empty.

Syntax

E poll()

Parameters:

The poll() method does not take any parameters.

Return value:

• Returns the head element (E) of the queue and removes it.
• Returns null if the queue is empty.

Example

In this example, a queue is used to store elements and the poll() method processes them one by one in FIFO order:

import java.util.Queue;
import java.util.LinkedList;

public class PollQueueExample {
  public static void main(String[] args) {
    // Create a queue
    Queue<String> queue = new LinkedList<>();

    // Add elements to the queue
    queue.add("A");
    queue.add("B");
    queue.add("C");

    // Process elements
    while (!queue.isEmpty()) {
      // Removes and returns the head of the queue
      String element = queue.poll();
      System.out.println("Processing element: " + element);
    }
  }
}

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The output of this code is:

Processing element: A
Processing element: B
Processing element: C

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