static void Main(string[] args) { //ToSTring()를 오버라이드 해서 폰 매니저해서 사용해보기 PhoneBookManager manager = new PhoneBookManager("오버워치", "감자튀김"); PhoneBookManager manager2 = new PhoneBookManager("유튜브", "피자"); manager.ReadSerial(); Console.WriteLine(manager.ToString()); Console.WriteLine(manager2.ToString()); while (true) { manager.ShowMenu(); int choice = int.Parse(Console.ReadLine()); switch (choice) { case 1: manager.InputData(); break; case 2: manager.ListData(); break; case 3: manager.SearchData(); break; case 4: manager.DeleteData(); break; case 5: Console.WriteLine("프로그램을 종료합니다."); manager.SaveSerial(); return; } } }