BlockingDeque poll() method in Java with examples
The poll() 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 poll()
Parameters: This method does not accept any parameters.
Returns: This method returns front element of the Deque container if the container is not empty and deletes it. It returns null if the container is empty.
Note: The poll() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.
Below programs illustrate poll() 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.add( 7855642 );
BD.add( 35658786 );
BD.add( 5278367 );
BD.add( 74381793 );
System.out.println( "Blocking Deque: " + BD);
System.out.println( "Front element in Deque: " + BD.poll());
System.out.println( "Blocking Deque: " + BD);
}
}
|
Output:
Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Front element in Deque: 7855642
Blocking Deque: [35658786, 5278367, 74381793]
Program 2:
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.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.poll());
}
}
|
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#poll(long, %20java.util.concurrent.TimeUnit)
Last Updated :
01 Oct, 2019
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