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Showing content from https://www.geeksforgeeks.org/java/blockingdeque-take-method-in-java-with-examples/ below:

BlockingDeque take() method in Java with Examples

Last Updated : 14 Oct, 2019

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


 // 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


 // 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()

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