BlockingDeque pollFirst() method in Java with examples
Last Updated :
01 Oct, 2019
The pollFirst() method of BlockingDeque returns the front element in the Deque container, and deletes it. It returns null if the container is empty.
Syntax:
public E pollFirst()
Parameters: This method does not accept any parameters.
Returns: This method returns front element in the Deque container if the container is not empty and deletes the element. It returns null if the container is empty.
Note: The pollFirst() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.
Below programs illustrate pollFirst() method of BlockingDeque:
Program 1:
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
BlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>();
BD.addFirst(7855642);
BD.addFirst(35658786);
BD.addFirst(5278367);
BD.addFirst(74381793);
System.out.println("Blocking Deque: " + BD);
System.out.println("Front element in Deque: " + BD.pollFirst());
System.out.println("Blocking Deque: " + BD);
}
}
|
Output:
Blocking Deque: [74381793, 5278367, 35658786, 7855642]
Front element in Deque: 74381793
Blocking Deque: [5278367, 35658786, 7855642]
Program 2:
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
LinkedBlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>();
BD.add(7855642);
BD.add(35658786);
BD.add(5278367);
BD.add(74381793);
System.out.println("Blocking Deque: " + BD);
BD.clear();
System.out.println("Front element in Deque: " + BD.pollFirst());
}
}
|
Output:
Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Front element in Deque: null
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#pollFirst(long, %20java.util.concurrent.TimeUnit)
Like Article
Suggest improvement
Share your thoughts in the comments
Please Login to comment...