Java for AP CS A

Every lesson runs in your browser — write real code, press Run, and the tasks check themselves. Free, no account needed, with notes in English and Chinese.

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Lessons in this course

1. history A short history of Java
2. usage What Java is used for
3. resources Where to learn more
4. setup Set up your computer
5. 01 Java basics: classes, main, and output
6. 02 Using objects: String, Math, and wrappers
7. 03 Booleans and selection: if/else and logic
8. 04 Loops: while, for, and accumulation
9. 05 Strings and nested loops
10. 06 Writing a class: fields, constructor, methods
11. 07 Encapsulation: private fields, getters, setters
12. 08 1-D arrays: store, index, and traverse
13. 09 Array algorithms: max, count, search, average
14. 10 ArrayList: a list that grows
15. 11 ArrayList algorithms: filter and the remove bug
16. 12 2-D arrays: working with a grid
17. 13 Searching: linear and binary
18. 14 Sorting: selection and insertion sort
19. 15 Recursion: base case and recursive case
20. 16 Text files: write and read with Scanner
21. 17 Inheritance: extends, super, and overriding
22. 18 Polymorphism: dynamic dispatch and toString()
23. 19 FRQ workshop: the 4 question types

Language reference

/know/reference/java