AP CSA

AP Computer Science A • CED-aligned (Fall 2025)

AP Computer Science A

Clean lesson notes + examples + practice for each topic. Use the Unit dropdowns to navigate, and start from the Unit Overview pages to see the full topic list.

Start Unit 1 Go to Unit 2 View Syllabus

How to use this site

  1. Open a Unit Overview (Unit 1–4).
  2. Use the topic list to study in order.
  3. Check the Quiz section on the Unit Overview page for unit-level quizzes.

✅ Quizzes can be accessed from the Unit Overview page.

Recommended routine

  • Read the topic notes (2–6 min).
  • Copy the code examples and run them.
  • Do the quick self-check questions at the end.
  • After finishing the unit, take the unit quiz from the Unit Overview.

Units

Unit 1 — Using Objects and Methods
Basics of Java, variables, methods, Strings
Open →
Unit 2 — Selection and Iteration
Booleans, if, loops, algorithm patterns
Open →
Unit 3 — Class Creation
Designing classes, constructors, methods
Open →
Unit 4 — Data Collections
Arrays, ArrayLists, 2D arrays
Open →

What’s inside each topic page

  • The big idea (what the topic is really about)
  • Core vocabulary (terms you must know)
  • Rules + examples (the “AP testable” parts)
  • Common mistakes (what students miss)
  • Quick self-check (fast practice)

Tip: If you ever feel lost, go back to the Unit Overview and follow the order.

Quick links

Built from the AP CSA Course & Exam Description (effective Fall 2025). Quizzes can be accessed from each Unit Overview.