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BlockingDeque take() method in Java with Examples
  • Last Updated : 14 Oct, 2019
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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()

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