Java Unit 3 Quiz — Arrays, Array Algorithms, ArrayLists, Inheritance & Polymorphism (DOCX + Answer Key)

Assess student understanding of core Java OOP and data-structure foundations with this clean, classroom-ready Unit 3 Quiz covering Arrays, Array Algorithms, ArrayLists, and Introductory Inheritance/Polymorphism. Designed specifically for high school Computer Science classrooms, this quiz includes multiple coding tasks, prediction problems, debugging practice, and a class-design prompt to reinforce essential AP CSA-aligned skills.

Perfect for summative assessments, end-of-unit checks, review days, and AP CSA practice!

✔️ What’s Included

📄 Fully Formatted Student Quiz (DOCX)
Covers Lessons 3.5–3.8

• Section A — Multiple Choice (6 questions)
  
• Section B — Output Prediction (3 code problems)
  
• Section C — Debug the Code (2 broken snippets on arrays + inheritance)
  
• Section D — Short Answer (3 conceptual explanations)
  
• Section E — Coding Prompt (ArrayList class design task)
  

🧩 Complete Answer Key Included

• Correct MCQ answers
  
• Predicted output for all code problems
  
• Fixed code for debugging sections
  
• Sample short-answer responses
  
• A full solved class for the coding prompt
  

🎓 Skills Assessed

Students will demonstrate understanding of:

Arrays & Array Algorithms

• Declaring and initializing arrays
  
• Looping and traversal (indexed & enhanced for loops)
  
• Searching, counting, max/min, shifting
  

ArrayLists

• Adding, removing, accessing items
  
• Using .add(), .get(), .remove(), .size()
  
• Writing algorithms using ArrayLists
  

Inheritance & Polymorphism

• Extending classes
  
• Overriding methods
  
• Using superclass references for subclass objects
  

⭐ Why Teachers Love This Quiz

• Clean, professional layout
  
• Clear instructions for every section
  
• Coding + conceptual blend
  
• Matches typical high school pacing
  
• Zero prep—just print and give!
  
• Great benchmark for AP CSA Units 6–9
  

📘 Standards Alignment (CSTA & AP CSA Core Topics)

• CSTA 3A-AP-14 — Use libraries and APIs
  
• CSTA 3A-AP-16 — Design and develop computational artifacts
  
• AP CSA: Arrays, ArrayLists, Class Design, Inheritance, Polymorphism
  

💬 Ideal For

• AP Computer Science A
  
• Intro to Java / CS2 Courses
  
• Unit Tests or Mid-Unit Checks
  
• Review Days
  
• Sub-Day Assessments
  
• Spring Exam Prep