AP Computer Science A · CS III

Your study hub for CS.

Notes, Java examples, and interactive games — everything you need for AP Computer Science A and CS III.

10 Units

AP Computer Science A

Java fundamentals, OOP, arrays, inheritance, recursion, and sorting — aligned to the AP exam.

10 Units

Files, sets & maps, regex, linked lists, stacks, trees, multithreading, and advanced algorithms.

Interactive

Master recursion and divide-and-conquer with this classic puzzle.

Toggle 8 bits to match target decimals — race against the clock.

Convert falling binary numbers to decimal before they hit the bottom.