> `ConcurrentLinkedDeque` is a thread-safe, unbounded [deque](https://docs.oracle.com/javase/8/docs/api/java/util/Deque.html). The `null` value is not permitted as an element. We can use the `ConcurrentLinkedDeque` when multiple threads share a single deque.


The **`pollFirst()`** method gets and removes the first element of the `ConcurrentLinkedDeque` object.

#    
## Syntax

```java
public E pollFirst()
```

## Parameters
This method doesn’t take any parameters.

## Return value

The `pollFirst()` method retrieves and removes the first element of the `deque` object. If the `deque` object is empty, then the method returns `null`.

> This method is similar to the `removeFirst()` method, except that the `removeFirst()` method throws the `NoSuchElementException` if the `deque` is empty, whereas the `pollFirst` method returns `null`.



## Code

The code below demonstrates the use of the `pollFirst()` method.

import java.util.concurrent.ConcurrentLinkedDeque;
class PollFirst {
    public static void main( String args[] ) {
      ConcurrentLinkedDeque<String> deque = new ConcurrentLinkedDeque<>();
      deque.add("1");
      deque.add("2");
      deque.add("3");
      System.out.println("The deque is " + deque);

      System.out.println("deque.pollFirst() returns : " + deque.pollFirst());
      System.out.println("The deque is " + deque);
    }
}

#    
## Explanation

In the code above:

* In line `1`: We import the `ConcurrentLinkedDeque` class.

* In line `4`: We  create a `ConcurrentLinkedDeque` 
 object named `deque`. 

* In lines `5-7`: We use the 
`deque` object to add three elements `("1","2","3")` to `deque`.


* In line `10`: We use the `pollFirst()` method of the `deque` object to get and remove the first element. In our case, `1` will be removed and returned.

What is the ConcurrentLinkedDeque.pollFirst() method in Java?

ConcurrentLinkedDeque's pollFirst() method retrieves and removes the first element, returning null if empty.