C#静态构造函数

using System;
   public class Account
    {
        public int id; 
        public String name;
        public static float rateOfInterest;
        public Account(int id, String name)
        {
            this.id = id;
            this.name = name;
        }
        static Account()
        {
            rateOfInterest = 9.5f;
        }
        public void display()
        {
            Console.WriteLine(id + " " + name+" "+rateOfInterest);
        }
   }
   class TestEmployee{
       public static void Main(string[] args)
        {
            Account a1 = new Account(101, "Sonoo");
            Account a2 = new Account(102, "Mahesh");
            a1.display();
            a2.display();

        }
    }