AP CSA Unit 3: Class Creation

Unit 3 of 4  ·  AP CSA 2025–2026 CED

Unit 3: Class Creation

Learn to design and build your own Java classes from scratch. This unit covers abstraction, constructors, accessors, mutators, static members, scope, and the this keyword — the foundation of object-oriented programming on the AP exam. Accounts for 10–18% of the AP exam.

9 of 9 lessons live — 100% complete

9Lessons
10–18%AP Exam Weight
108Practice MCQs
36Mastery MCQs
18Interactive Games
What You'll Master in Unit 3
  • Apply abstraction to identify the right attributes and behaviors for any class
  • Write constructors, accessors, and mutators following AP exam conventions
  • Explain pass-by-value for primitives vs. reference semantics for objects
  • Use static variables and methods correctly (and avoid the classic compile errors)
  • Resolve variable shadowing with this in constructors and methods
  • Predict output and spot bugs in class-design code
📖 Unit 3 Study Guide Complete reference & review 📝 Unit 3 Practice Exam Full timed MCQ test ⚙ Test Builder Custom quizzes from 586 questions 👩​🏫 1-on-1 Tutoring Live help from Tanner Crow
Lessons

All 9 Lessons — Start Anywhere

3.1 Abstraction and Program Design Conceptual › 3.2 Impact of Program Design Conceptual › 3.3 Anatomy of a Class Code Mechanics › 3.4 Constructors Code Mechanics › 3.5 Methods: How to Write Them Code Mechanics › 3.6 Methods: Passing and Returning References of an Object Code Mechanics › 3.7 Class Variables and Methods Code Mechanics › 3.8 Scope and Access Code Mechanics › 3.9 this Keyword Code Mechanics ›
Navigate the Course
Unit 1 Using Objects Unit 2 Selection & Iteration Unit 3 ✓ Class Creation Unit 4 Data Collections
← Unit 2 Unit 4 →

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