ArrayDeque.peekFirst() in Java

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

Syntax:

E java.util.ArrayDeque.peekFirst()

This method retrieves but does not remove, the first element of this deque, or returns null if this deque is empty.

Parameters: NA

Returns: the head of this deque, or null if this deque is empty.

Exceptions: NA

Approach

Java

import java.util.ArrayDeque;

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

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

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

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

    }
}

Output:

1