Queue poll() method example in Java

Fetch and remove the first element in Queue using the poll() method.

Create a queue −

Queue<String> q = new LinkedList<String>();

Add some elements −

q.add("abc");
q.add("def");
q.add("ghi");
q.add("jkl");
q.add("mno");
q.add("pqr");
q.add("stu");
q.add("vwx");

Now, remove the first element −

q.poll()

The following is an example to implement the poll() method −

Example

 Live Demo

import java.util.LinkedList;
import java.util.Queue;
public class Demo {
   public static void main(String[] args) {
      Queue<String> q = new LinkedList<String>();
      q.add("abc");
      q.add("def");
      q.add("ghi");
      q.add("jkl");
      q.add("mno");
      q.add("pqr");
      q.add("stu");
      q.add("vwx");
      System.out.println("Queue head = " + q.element());
      System.out.println("Removing element from queue = " + q.poll());
      System.out.println("Queue head now = " + q.element());
      System.out.println("Removing element from queue = " + q.poll());
      System.out.println("Queue head now = " + q.element());
      System.out.println("\nRemaining Queue elements...");
      Object ob;
      while ((ob = q.poll()) != null) {
         System.out.println(ob);
      }
   }
}

Output

Queue head = abc
Removing element from queue = abc
Queue head now = def
Removing element from queue = def
Queue head now = ghi
Remaining Queue elements...
ghi
jkl
mno
pqr
stu
vwx