Java Long class

Java LinkedBlockingDeque element() method

Last Updated : 17 Mar 2025

The element() method of LinkedBlockingDeque class returns the head of the queue corresponding to this deque but does not withdraw it. The result returned by this method is similar to the one returned by getFirst() method.

Syntax:

Parameters:

Specified By:

The element() method of LinkedBlockingDeque class is specified by:

element() method in interface BlockingDeque<E>.
element() method in interface Deque<E>.
element() method in interface Queue<E>.
element() method in interface AbstractQueue<E>.

Overrides:

The element() method of LinkedBlockingDeque class is overrided by element() method in class AbstractQueue<E>.

Return Value:

The element() method returns the head of the queue corresponding to this deque.

Throws:

The element() method throws NoSuchElementException, if this deque is empty.

Example 1

import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequeElementExample1 {
    public static void main(String[] args) {
        int capacity = 50;
        LinkedBlockingDeque<String> LBdeque = new LinkedBlockingDeque<String>(capacity);
        LBdeque.add("Harish");
        LBdeque.add("Ishant");
        LBdeque.add("Janak");
        LBdeque.add("Kapil");
        LBdeque.add("Lakshay");
        LBdeque.add("Mahesh");
        System.out.println("Head of the Queue is : "+LBdeque.element());
    }
}

Output:

Head of the Queue is : Harish

Example 2

import java.util.concurrent.LinkedBlockingDeque;
class Topper{
    String name;
    int marks;
    public Topper(int marks,String name) {
        this.name = name;
        this.marks = marks;
    }
    public String toString(){
        return name +" got "+ marks+" marks.";
    }
}
public class LinkedBlockingDequeElementExample2 {
    public static void main(String[] args) {
        Topper topper1 = new Topper(97,"Hinna");
        Topper topper2 = new Topper(87,"Vinni");
        Topper topper3 = new Topper(77,"Rima");
        int capacity =100;
        LinkedBlockingDeque<Topper> deque = new LinkedBlockingDeque<Topper>(capacity);
        deque.add(topper1);
        deque.add(topper2);
        deque.add(topper3);
        for (Topper xyz : deque){
            System.out.println(xyz);
        }
        System.out.println();
        System.out.println("Topper of the class is "+deque.element().name);
    }
}

Output:

Hinna got 97 marks.
Vinni got 87 marks.
Rima got 77 marks.
Topper of the class is Hinna

Example 3

import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequeElementExample3 {
    public static void main(String[] args) {
        int capacity = 100;
        LinkedBlockingDeque<String> deque = new LinkedBlockingDeque<String>(capacity);
        deque.add(null);
        deque.add("Sham");
        deque.add("Mira");
        deque.add("Rajesh");
        System.out.println("First string : "+deque.element());
    }
}

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.util.concurrent.LinkedBlockingDeque.offerLast(LinkedBlockingDeque.java:357)
	at java.util.concurrent.LinkedBlockingDeque.addLast(LinkedBlockingDeque.java:334)
	at java.util.concurrent.LinkedBlockingDeque.add(LinkedBlockingDeque.java:633)
	at com.TpointTech.LinkedBlockingDequeElementExample3.main(LinkedBlockingDequeElementExample3.java:9)

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Java LinkedBlockingDeque element() method

Syntax:

Parameters:

Specified By:

Overrides:

Return Value:

Throws:

Example 1

Example 2

Example 3

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Java LinkedBlockingDeque element() method

Syntax:

Parameters:

Specified By:

Overrides:

Return Value:

Throws:

Example 1

Example 2

Example 3

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