Added md file for poll term (#7477)

* Added md file for poll term

* content fixes

* Update poll.md

* Tag order fix

* comment fix

* format fixes

---------

Author: Taahirahbz

content/java/concepts/queue/terms/poll/poll.md

@@ -0,0 +1,66 @@
+---
+Title: 'poll()'
+Description: 'Retrieves and removes the head of the queue, or returns null if the queue is empty.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Java'
+  - 'Queues'
+CatalogContent:
+  - 'learn-java'
+  - 'paths/computer-science'
+---
+
+In Java, the **`poll()`** method of a queue retrieves and removes the head element, or returns `null` if the queue is empty.
+
+## Syntax
+
+```pseudo
+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:
+
+```java
+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);
+    }
+  }
+}
+```
+
+The output of this code is:
+
+```shell
+Processing element: A
+Processing element: B
+Processing element: C
+```