BlockingDeque element() method in java with examples

The element() method of BlockingDeque returns the element at the front the container. It does not delete the element in the container. This method returns the head of the queue represented by this deque.

Syntax:

public void element()

Parameters: This method does not accept any parameter.

Returns: This method returns the head of the queue represented by this deque.

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

Below programs illustrate element() method of BlockingDeque:

Program 1: 

Java

// Java Program Demonstrate element()
// 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 IllegalStateException
    {

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

        // Add numbers to end of BlockingDeque
        BD.add(10);
        BD.add(20);
        BD.add(30);
        BD.add(40);

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

        System.out.println("Blocking Deque front element: " + BD.element());
    }
}

Output:

Blocking Deque: [10, 20, 30, 40]
Blocking Deque front element: 10

Program 2:

Java

// Java Program Demonstrate element()
// method of BlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
import java.util.concurrent.BlockingDeque;

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

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

        // Add numbers to end of BlockingDeque
        BD.add("ab");
        BD.add("cd");
        BD.add("fg");
        BD.add("xz");

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

        System.out.println("Blocking Deque front element: " + BD.element());
    }
}

Output:

Blocking Deque: [ab, cd, fg, xz]
Blocking Deque front element: ab

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