import java.util.LinkedList;
import java.util.Queue;
public class Main {
public static void main(String[] args) {
Queue queue = new LinkedList();
queue.offer("First");
queue.offer("Second");
queue.offer("Third");
queue.offer("Fourth");
System.out.println("Size: " + queue.size());
System.out.println("Queue head using peek : " + queue.peek());
System.out.println("Queue head using element: " + queue.element());
Object data;
while ((data = queue.poll()) != null) {
System.out.println(data);
}
}
}