LinkedBlockingDeque take() method in Java

The take() method of LinkedBlockingDeque 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.

Below programs illustrate take() method of LinkedBlockingDeque:

Program 1:

// Java Program to demonstrate take()
// 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 and prints it
        System.out.println("Head of Linked Blocking Deque: "
                           + LBD.take());

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

Output:

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

Program 2: To demonstrate InterruptedException

// Java Program to demonstrate take()
// 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>();

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

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

RuntimeException:

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

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