static void Main(string[] args) { Mahasiswa mhs1 = new Mahasiswa(); mhs1.Nim = "1234"; mhs1.NamaMahasiswa = "Erick"; Mahasiswa mhs2 = new Mahasiswa(); mhs1.Nim = "1235"; mhs1.NamaMahasiswa = "Wely"; Dosen dosen1 = new Dosen(); mhs1.Nik = "0043"; mhs1.NamaDosen = "Jhono"; Dosen dosen2 = new Dosen(); mhs1.Nik = "0045"; mhs1.NamaDosen = "Jhoni"; ArrayList list = new ArrayList(); list.Add(mhs1); list.Add(mhs2); list.Add(dosen1); list.Add(dosen2); Mahasiswa mhs = (Mahasiswa)list[1]; Console.WriteLine("{0}, {1}", mhs.Nim, mhs.NamaMahasiswa); Dosen dosen = (Dosen)list[2]; Console.WriteLine("{0}, {1}", dosen.Nik, dosen.NamaDosen); Console.ReadKey(); }