AP Computer Science A
Learn Java by writing every line of it yourself.
A full AP CSA course built like a notebook: watch a short lesson, type the code by hand, and run it against real tests. No copying, no shortcuts — which is exactly why it sticks.
No account needed. Nothing you write is sent to us — your progress stays in this browser.
public class Main {
public static void main(String[] args) {
for (int i = 1; i <= 10; i++) {
System.out.println(i);
}
}
}Output
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How a lesson goes
Watch the lesson
Short videos that show the idea being used, not just defined. Pick up where you left off, on any machine.
Type the code yourself
Every character is yours. The editor accepts code you wrote and refuses code you did not, so the practice is real practice.
Run it against hidden tests
Your program compiles and runs in about a second, then gets checked against cases you cannot read ahead of time.
What you will cover
Four units, following the College Board sequence. Each one ends with code you wrote from scratch.
Unit 1
Using Objects and Methods
Variables, types, and calling the methods someone else already wrote.
Unit 2
Selection and Iteration
if, else, and the loops that do the work for you.
Unit 3
Class Creation
Writing your own classes, constructors, and instance methods.
Unit 4
Data Collections
Arrays, ArrayLists, and the algorithms that walk them.
Pasting code from a website or a friend is refused. Copying and moving code you typed yourself works normally — rename a variable, pull a loop into a method, restructure whatever you like.
The point is not to catch anyone out. It is that the typing is where the learning happens, and the exam is handwritten.
Ready when you are.
Fifty Unit 1 labs, free and open. Nothing to sign up for.
Start practising
Built by Azaharul Islam