The java.util.concurrent.ConcurrentLinkedDeque.pollLast() is an in-built method in Java which retrieves the last element of this deque and removes it. If the deque is empty, the method returns NULL.
Syntax:
Conn_Linked_Deque.pollLast()
Parameters: The function accepts no parameters.
Return Values:The function returns the last 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.
/* Java Program Demonstrate pollLast()  method of ConcurrentLinkedDeque  */  import java.util.concurrent.*;  class ConcurrentLinkedDequeDemo {    public static void main(String[] args)    {        ConcurrentLinkedDeque<Integer> cld =                      new ConcurrentLinkedDeque<Integer>();          cld.addFirst(12);        cld.addFirst(70);        cld.addFirst(1009);        cld.addFirst(475);          // Displaying the existing LinkedDeque        System.out.println("Elements in"                           + "the LinkedDeque: " + cld);          // Display and remove the Last element        System.out.println("Element removed : "                           + cld.pollLast());          // Displaying the elements        System.out.println("Elements in"                           + "the LinkedDeque: " + cld);    }} |
Output:
Elements inthe LinkedDeque: [475, 1009, 70, 12] Element removed : 12 Elements inthe LinkedDeque: [475, 1009, 70]
Program 2: This program involves deque with String elements.
/* Java Program Demonstrate pollLast()  method of ConcurrentLinkedDeque  */  import java.util.concurrent.*;  class ConcurrentLinkedDequeDemo {    public static void main(String[] args)    {        ConcurrentLinkedDeque<String> cld =                        new ConcurrentLinkedDeque<String>();          cld.addFirst("GFG");        cld.addFirst("Geeks");        cld.addFirst("Gfg");        cld.addFirst("Geeks");          // Displaying the existing LinkedDeque        System.out.println("Elements in"                           + "the LinkedDeque: " + cld);          // Display and remove the Last element        System.out.println("Element removed : "                           + cld.pollLast());          // Displaying the elements        System.out.println("Elements in"                           + "the LinkedDeque: " + cld);    }} |
Output:
Elements inthe LinkedDeque: [Geeks, Gfg, Geeks, GFG] Element removed : GFG Elements inthe LinkedDeque: [Geeks, Gfg, Geeks]
Reference:https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#pollLast()
