static void Main(string[] args) { Student S1 = new Student("Jack", 20, "男"); S1.SetCredit(30); Console.WriteLine("第一位學生"); S1.GetCredit(); Student S2 = new Student("Merry", 20, "女"); S2.SetCredit(40); Console.WriteLine("第二位學生"); S2.GetCredit(); Console.WriteLine("第一位學生"); S1.GetCredit(); Console.Read(); }