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

The ConcurrentLinkedDeque is thread-safe unbounded deque. The null value is not permitted as an element. We can use the ConcurrentLinkedDeque when multiple threads are sharing a single Deque.

The removeLast method gets and removes the last element of the ConcurrentLinkedDeque object.

Syntax

public E removeLast()

Parameters

This method doesn’t take any parameters.

Return value

This method retrieves and removes the last element of the Deque object. If the Deque object is empty then NoSuchElementException is thrown.

This method is similar to the pollLast method except that the removeLast method throws the NoSuchElementException if the deque is empty whereas the pollLast method returns null.

Code

The code below demonstrates the use of the removeLast method:

import java.util.concurrent.ConcurrentLinkedDeque;
class RemoveLast {
    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.removeLast() returns : " + deque.removeLast());
      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.

  • From lines 5 to 7, we use the deque object to add three elements("1","2","3") to deque.

  • In line 10, we use the removeLast() method of the deque object to get and remove the last element. In our case, 3 will be removed and returned.

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