public static void TestIterator() { Console.WriteLine("------------Iterator------------"); Song song1 = new Song("Jordan Rakei", "Eye to Eye"); Song song2 = new Song("Billie Eilish", "Bad guy"); Song song3 = new Song("Tom Misch", "Movie"); Song song4 = new Song("Jordan Rakei", "Mad world"); Song song5 = new Song("Jordan Rakei", "Cauliflower"); Aggregate songsArray = new SongArray(); songsArray.Add(song1); songsArray.Add(song2); songsArray.Add(song3); songsArray.Add(song4); songsArray.Add(song5); Aggregate songsList = new SongList(); songsList.Add(song1); songsList.Add(song2); songsList.Add(song3); songsList.Add(song4); songsList.Add(song5); IIterator arrayIterator = songsArray.CreateIterator(); Console.WriteLine("--------------Songs Array------------------"); for (; arrayIterator.HasNext(); arrayIterator.Next()) { Song song = arrayIterator.CurrentElement(); Console.WriteLine(song.ToString()); } IIterator listIterator = songsList.CreateIterator(); Console.WriteLine("--------------Songs List------------------"); for (; listIterator.HasNext(); listIterator.Next()) { Song song = listIterator.CurrentElement(); Console.WriteLine(song.ToString()); } Console.WriteLine("----------------------------------"); }