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);
}
} |
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);
}
} |
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()