static void Main(string[] args)
{
Employee employee1 = new Employee();
employee1.set("张三", "20180001");
Employee employee2 = new Employee();
employee2.set("李四", "20180002");
Employee employee3 = new Employee();
employee3.set("王五", "20180003");
employee1.Show();
employee2.Show();
employee3.Show();
}