ArrayDeque.peek() in Java

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

Syntax:

E java.util.ArrayDeque.peek()

This method retrieves but does not remove, the head of the queue represented by this deque, or returns null if this deque is empty.

Parameters: NA

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

Exceptions: NA

Approach

Java

import java.util.ArrayDeque;

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

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

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

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

    }
}

Output:

1