LinkedBlockingDeque remove() method in Java

Last Updated : 17 Sep, 2018

The remove() method of LinkedBlockingDeque removes the head of the Deque container. The method throws a NoSuchElementException if the Deque container is empty. Syntax:

public E remove()

Parameters: This method does not accepts any parameter. Returns: This method does not returns anything. Exception: The function throws a NoSuchElementException if the Deque is empty. Below programs illustrate remove() method of LinkedBlockingDeque: Program 1:

Java

// Java Program Demonstrate remove()
// method of LinkedBlockingDeque

import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;

public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {

        // create object of LinkedBlockingDeque
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>();

        // Add numbers to end of LinkedBlockingDeque
        LBD.add(7855642);
        LBD.add(35658786);
        LBD.add(5278367);
        LBD.add(74381793);

        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);

        // removes the front element
        LBD.remove();
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

Output:

Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Linked Blocking Deque: [35658786, 5278367, 74381793]

Program 2:

Java

// Java Program Demonstrate remove()
// method of LinkedBlockingDeque

import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;

public class GFG {
    public static void main(String[] args)
        throws NoSuchElementException
    {

        // create object of LinkedBlockingDeque
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>(6);

        // Add numbers to end of LinkedBlockingDeque
        LBD.add(7855642);
        LBD.add(35658786);
        LBD.add(5278367);
        LBD.add(74381793);

        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);

        // Deque is empty
        LBD.clear();

        // throws an exception
        LBD.remove();
    }
}

Output:

Exception in thread "main" java.util.NoSuchElementException
    at java.util.concurrent.LinkedBlockingDeque.removeFirst(LinkedBlockingDeque.java:453)
    at java.util.concurrent.LinkedBlockingDeque.remove(LinkedBlockingDeque.java:672)
    at GFG.main(GFG.java:30)

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingDeque.html#remove--