**CS1021 Software Development II** Lecture Videos Winter 2018-2019 Week 2 Lecture 3 # Introduction and Review [download](oldlecs/1021-2-3a.mp4)  # References and Casting [download](oldlecs/1021-2-3b.mp4)  # Abstract Methods and Classes [download](oldlecs/1021-2-3c.mp4)  # Aside: Declaring class as final [download](oldlecs/1021-2-3d.mp4)  # protected Keyword [download](oldlecs/1021-2-3e.mp4)  # List of Shapes [download](oldlecs/1021-2-3f.mp4)