Build your students' ability to trace through Java programs involving inheritance and polymorphism — one of the most conceptually challenging and heavily tested areas of the AP CS A exam. This worksheet covers dynamic dispatch, the super keyword, abstract classes, and interfaces.

⭐ WHAT'S INCLUDED:

• 20 code tracing exercises across 4 sections
• Section A — Method Overriding & Polymorphism
• Section B — super keyword & Abstract Classes
• Section C — Interfaces, Constructor Chaining & Overloading
• Section D — Advanced Inheritance & AP Challenges
• Full answer key with explanations — teacher use only

⭐ SKILLS COVERED:

• extends and method overriding
• Dynamic dispatch (runtime polymorphism)
• super() and super.method()
• Abstract classes and abstract methods
• Interfaces and implements
• Constructor chaining
• Method overloading
• instanceof operator
• Static vs instance field resolution
• Inner classes

⭐ PERFECT FOR:

• AP CS A Unit 9 practice
• FRQ preparation
• Bell ringers and warm-up activities
• Test and quiz review
• Sub plans

⭐ DETAILS:

• Grade level: 9–12
• Time: 40–60 minutes
• Format: Printable PDF — works digitally too
• Language: Java
• Answer key included on a separate page

This is Pack 9 of the AP CS A Code Tracing Series. Collect all 10 packs or grab the complete bundle!