Mar 19: Extending Classes

Learning Objectives

After today's class, you should be able to:

• Summarize uses of the keywords extends and super.
• Explain which methods can be called by a variable using polymorphism.
• Predict which method will actually run when polymorphism is involved.

Lesson Outline

Exam Debrief [10 min]

• See the feedback on Gradescope

Act10 [45 min]

• Activity 10: Inheritance

Mini Lecture [20 min]

• Overview of HW 7
  • Submit stubs by Friday (Part A, 20 pts)
  • Finish code by Monday (Part B, 80 pts)
• Demo of StdDraw
  • Lab 6: Shapes and Houses (skipped)
  • Solution Files on Canvas

Your To-Do List

By Friday but ideally before Thursday's class:

• Do the Week 9 reading
• Take Quiz07 on Canvas
• Read the HW 7 spec and set up your files
• Submit Part A to Gradescope (unlimited)

Memory Diagram

Here is the diagram I drew on the whiteboard (see Model1.java):