Queue

import java.util.Queue;
import java.util.Iterator;
import java.util.LinkedList;
public class Main{
    public static void main(String args[]){
        Queue  q = new LinkedList();
        for(int i=5;i>=0;i--) q.add(i);
        Iterator it =  q.iterator();

        System.out.println(q.size());
        System.out.println(q.isEmpty());

        while(it.hasNext()){
            System.out.println(it.next());
        }

        while(!q.isEmpty()){
            System.out.println(q.peek());
            q.poll();
        }

        System.out.println(q.size());
        System.out.println(q.isEmpty());
    }
}