BlockingDeque take() method in Java with Examples

The take() method of BlockingDeque returns and removes the head of the Deque container from it. The method throws an InterruptedException if it is interrupted while waiting.

Syntax:

public E take()

Returns: This method returns the head of the Deque container.

Exception: The function throws a InterruptedException if it is interrupted while waiting.

Note: The take() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.

Below programs illustrate take() method of BlockingDeque:

Program 1:

// Java Program to demonstrate take()
// method of LinkedBlockingDeque

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

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

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

        // Add numbers to end of BlockingDeque
        BD.add(7855642);
        BD.add(35658786);
        BD.add(5278367);
        BD.add(74381793);

        // print Deque
        System.out.println("Blocking Deque: " + BD);

        // removes the front element and prints it
        System.out.println("Head of Blocking Deque: "
                           + BD.take());

        // prints the Deque
        System.out.println("Blocking Deque: " + BD);
    }
}

Output:

Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Head of Blocking Deque: 7855642
Blocking Deque: [35658786, 5278367, 74381793]

Program 2: To demonstrate InterruptedException

// Java Program to demonstrate take()
// method of BlockingDeque

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

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

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

        // print Dequeue
        // the Deque is empty
        System.out.println("Blocking Deque: " + BD);

        try {
            // throws error as the list is empty
            // and it is interrupted while waiting
            System.out.println("Head of Blocking Deque: "
                               + BD.take());
        }
        catch (Exception e) {
            System.out.println("Exception: " + e);
        }
    }
}

Runtime Errors:

Max real time limit exceeded due to either by heavy load on server or by using sleep function.

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#take()