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BlockingDeque takeLast() method in Java with Examples

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  • Last Updated : 20 Nov, 2020

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

Syntax:  

public E takeLast()

Returns: This method returns the tail(last element) of the Deque container. 

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

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

Below programs illustrate takeLast() method of BlockingDeque:

Program 1:  

Java




// Java Program to demonstrate takeLast()
// 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>();
 
        // 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 last element and prints it
        System.out.println("Head of Blocking Deque: "
                           + BD.takeLast());
 
        // prints the Deque
        System.out.println("Blocking Deque: " + BD);
    }
}
Output: 
Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Head of Blocking Deque: 74381793
Blocking Deque: [7855642, 35658786, 5278367]



Program 2: 

Java




// Java Program to demonstrate takeLast()
// 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>();
 
        // 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);
 
        BD.clear();
 
        // throws error as the list is empty and it
        // is interrupted while waiting
        System.out.println("Head of Blocking Deque: "
                           + BD.takeLast());
    }
}

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#takeLast()
 


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