单例模式

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
        }

        //饿汉式（静态常量）[可用]
        public class Singleton
        {

            private static Singleton INSTANCE = new Singleton();

            private Singleton() { }
            public static Singleton getInstance()
            {
                return INSTANCE;


            }
        }
        //（静态代码块）[可用]
  
    }
}