package devmanuals.com;

import java.util.Queue;
import java.util.LinkedList;
import java.util.Iterator;

public class QueuePoll {
	public static void main(String[] args) {
		Queue<String> q = new LinkedList<String>();

		q.add("1");
		q.add("2");
		q.add("3");
		q.add("4");
		q.add("5");
		System.out.println("Is queue empty : " + q.isEmpty());
		System.out.println("Elements of queue : " + q);
		System.out.println("Size of queue before removing element : "
				+ q.size());
		System.out
				.println("Now after removing the head of the queue new queue is ");
		Object obj = q.poll();
		System.out.println(q);
		System.out.println("Removed element = " + obj);
		System.out
				.println("Size of queue after removing element : " + q.size());
		System.out.println("Removes all the elements from queue");
		Iterator lq = q.iterator();
		while (lq.hasNext()) {
			q.poll();
		}
		System.out.println(q);
		System.out.println("Is queue empty : " + q.isEmpty());
		// Here implementation of the poll( ) method will display 'null'
		System.out.println(q.poll());
	}

}