What is the Deque.peek() method in Java?

Overview

In this shot, we will discuss how to use the Deque.peek() method in Java.

The Deque.peek() method is present in the Deque interface inside the java.util package.

Deque.peek() is used to get the element at the head of the deque.

Syntax

Deque.peek()

Parameters

The Deque.peek() method doesn’t take any parameters.

Return value

  • Element: The element at the head of the deque.

Code

Let us look at the code snippet below.

import java.util.*;
class Main 
{
public static void main(String[] args)
{
Deque<Integer> d = new LinkedList<Integer>();
d.add(2);
d.add(28);
d.add(6);
d.add(80);
d.add(21);
d.add(7);
d.add(15);
System.out.println("The peek element of the deque is: "+d.peek());
}
}

Explanation

  • In line 1, we import the required package.

  • In line 2, we make a main class.

  • In line 4, we make a main function.

  • In line 6, we declare a deque that consists of Integer type elements.

  • From lines 8-14, we use the Deque.add() method to insert the elements in the deque.

  • In line 16, we use the Deque.peek() method to display the element at the head of Deque.

In this way, we can use the Deque.peek() method in Java.

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