ArrayDeque.element() in Java

ArrayDeque.element(): This method is available in java.util.ArrayDeque class of Java.

Syntax:

E java.util.ArrayDeque.element()

This method retrieves but does not remove, the head of the queue represented by this deque.

Parameters: NA

Returns: the head of the queue represented by this deque.

Throws:

NoSuchElementException - if this deque is empty

Approach 1: When no exception

Java

import java.util.ArrayDeque;

public class ArrayDequeelement {
    public static void main(String[] args) {

        ArrayDeque<Integer> arrayDeque = 
                        new ArrayDeque<Integer>();

        arrayDeque.add(1);
        arrayDeque.add(4);

        System.out.println(arrayDeque.element());

    }
}

Output:

1

Approach 2: NoSuchElementException 

Java

import java.util.ArrayDeque;

public class ArrayDequeelement {
    public static void main(String[] args) {

        ArrayDeque<Integer> arrayDeque = 
                       new ArrayDeque<Integer>();

        System.out.println(arrayDeque.element());

    }
}

Output:

Exception in thread "main" java.util.NoSuchElementException
	at java.base/java.util.ArrayDeque.getFirst(ArrayDeque.java:402)
	at java.base/java.util.ArrayDeque.element(ArrayDeque.java:551)