.NET Queue is rotational.

_note.md

.NET Queue is rotational.

test.cs

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication24
{
    class Program
    {
        static void Main(string[] args)
        {
            var q = new Queue<int>(4);
            q.Enqueue(1);
            q.Enqueue(2);
            q.Enqueue(3);
            q.Enqueue(4);
            q.Dequeue();
            q.Dequeue();
            q.Dequeue();
            q.Enqueue(5);

            var x = q.ToArray();
        }
    }
}