static void Main(string[] args) { Resume a = new Resume("Kuan"); a.setPersonalInfo("男", "25"); a.sexWorkExperience("2017-2018", "soft-world"); Resume b = (Resume)a.Clone(); b.sexWorkExperience("1998-2006", "YMCA"); Resume c = (Resume)a.Clone(); c.setPersonalInfo("男", "23"); a.Display(); b.Display(); c.Display(); Console.ReadKey(); }