Java Deque poll() Method

The poll() method of Java Deque Interface is used to retrieve and remove the head of the deque. On the other hand, if the deque is empty, the method may return null. The above method is equivalent to pollFirst().

Specified by:

poll in interface Queue<E>

Syntax:

Parameter:

Return:

The above method is used to return the first element of the given deque. Otherwise, the method may return a null value if the deque is empty.

Example 1

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequepollExample1 {
   public static void main(String[] args) {
	   Deque<Float> deque = new ArrayDeque<>();
	    deque.offerLast(45.6f);
		deque.offerLast(23f);
		deque.offerLast(45.8f);
		deque.offerLast(66.9f);
		Float val = deque.poll();
		System.out.println("The first element is : "+val);
		System.out.println("The final deque is given as : "+deque);
    }
}

Test it Now

Output:

The first element is : 45.6
The final deque is given as : [23.0, 45.8, 66.9]

Example 2

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequepollExample2 {
  public static void main(String[] args) {
	Deque<String> deque = new ArrayDeque<>();
	deque.offer("Java");
	deque.offer("is");	
	deque.offer("a");
	deque.offer("portable");
	deque.offer("language");
	String val = deque.poll();
   System.out.println("The first string value is : "+val);
   System.out.println("The final deque is given as : ");
   for (String string : deque) {
	System.out.println(string);
    }
  }
}

Test it Now

Output:

The first string value is : Java
The final deque is given as : 
is
a
portable
language

Example 3

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequepollExample3 {
  public static void main(String[] args) {
	Deque<Integer> deque = new ArrayDeque<>();
	deque.offer(34);
	deque.offer(65);
	deque.offer(59);
	deque.offer(95);
	deque.offer(68);
	int val = deque.poll();
   System.out.println("The first string value is : "+val);
   System.out.println("The final deque is given as : ");
  for (Integer integer : deque) {
	System.out.println(integer);
    }
  }
}

Test it Now

Output:

The first string value is : 34
The final deque is given as : 
65
59
95
68

Next TopicJava Deque

← prev next →

Latest Courses

We provides tutorials and interview questions of all technology like java tutorial, android, java frameworks

Contact info

G-13, 2nd Floor, Sec-3, Noida, UP, 201301, India

[email protected].

Python

AI, ML and Data Science

Java

B.Tech and MCA

Web Technology

Software Testing

Technical Interview

Java Interview

Web Interview

Database Interview

Company Interviews

Java Tutorial

Control Statements

Java Object Class

Java Inheritance

Java Polymorphism

Java Abstraction

Java Encapsulation

Java Array

Java OOPs Misc

Java String

Java String Methods

Java Regex

Exception Handling

Java Inner Class

Java Multithreading

Java Synchronization

Java Networking

Java Applet

Java Reflection

Java Conversion

Java JDBC

RMI

Internationalization

Java Array Class

Java AtomicInteger Class

Java AtomicLong Methods

Java Authenticator

Java BigDecimal class

Big Integer Class

Java Boolean class

Java Byte Class

Java Class

Java Collections class

Java Compiler Class

CopyOnWriteArrayList

Java Math Methods

LinkedBlockingDeque

Java Long class

LinkedTransferQueue

Java List

Java MulticastSocket

Java Number Class

Java Phaser Class

ArrayList Methods

Java Thread Methods

Java Projects

Java Programs

Java Misc

Java Date Class

Java ListIterator Class

Java NIO Tutorial

HttpURLConnection

Java Deque

Java HttpCookie Class

Java URL class

Java List Methods

Java Vector class

Java Collection Methods

Java Socket Class

Java Executors

Java Deque poll() Method

Specified by:

Syntax:

Parameter:

Return:

Example 1

Example 2

Example 3

Latest Courses