Java Utility Library

Java ArrayDeque - peek() Method

The java.util.ArrayDeque.peek() method is used to retrieve the head (first element) of the deque. Unlike the ArrayDeque poll method, it does not remove the retrieved element.

Syntax

public E peek()

Here, E is the type of element maintained by the container.

Parameters

No parameter is required.

Return Value

Returns the head (first element) of the deque.

Exception

NA.

Example:

In the example below, the java.util.ArrayDeque.peek() method is used to retrieve the head of the given deque.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a ArrayDeque
    ArrayDeque<Integer> MyDeque = new ArrayDeque<Integer>();

    //populating ArrayDeque 
    MyDeque.add(10);
    MyDeque.add(20);
    MyDeque.add(30);

    //printing ArrayDeque
    System.out.println("MyDeque contains: ");
    while(MyDeque.size() != 0) {
      System.out.println(MyDeque.peek());
      MyDeque.removeFirst();
   }
  }
}

The output of the above code will be:

MyDeque contains: 
10
20
30

❮ Java.util - ArrayDeque