EducatorCS Lab
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Stage 1 preview · AP Computer Science A, 2025–26 framework

Java practice that shows how students think

Educator CS Lab is a structured AP CSA environment. Students move from specification to algorithm, code, execution trace, tests and explanation — and teachers see the reasoning, not just the final answer.

Explore the demoRead a sample lesson
Illustration of the three-panel Java workspace for the Vowel Counter lab.
cs-lab / labs / vowel-counter
1public static int countVowels(String text)
2{
3    int count = 0;
4    for (int i = 0; i < text.length(); i++)
5    {
6        String letter = text.substring(i, i + 1);
7        if ("aeiouAEIOU".indexOf(letter) >= 0)
8        {
9            count++;
10        }
11    }
12    return count;
13}

How CS Lab works

One learning sequence for every activity

  1. Step 1

    Specify and plan

    Students restate the specification, then write an algorithm before touching code — so misunderstandings surface early.

  2. Step 2

    Code and trace

    A three-panel Java workspace keeps requirements, editor and hints side by side, with execution traces to predict behavior.

  3. Step 3

    Test and explain

    Tests, a written explanation and a short reflection complete each activity, giving teachers evidence of understanding.

Specification → Algorithm → Code → Execution Trace → Tests → Explanation → Reflection

Course map

Organized around the four 2025–26 AP CSA units

Unit and topic numbers are checked against the College Board Course at a Glance. Exam weightings below are the published ranges.

  • Unit 1
    Using Objects and Methods
    Algorithms, variables and expressions, then calling class and instance methods — including the Math and String classes.
    15 topicsExam 15–25%
  • Unit 2
    Selection and Iteration
    Boolean logic, if statements and loops, then the standard selection, iteration and String algorithms built from them.
    12 topicsExam 25–35%
  • Unit 3
    Class Creation
    Designing classes with abstraction in mind: constructors, methods, references, static members, scope and this.
    9 topicsExam 10–18%
  • Unit 4
    Data Collections
    Arrays, ArrayLists, 2D arrays and text files, with searching, sorting, recursion and the ethics of data collection.
    17 topicsExam 30–40%

Source: AP Computer Science A Course and Exam Description (2025-26), Course at a Glance V.1.

Built for schools

A workspace for each role in the classroom

  • Students

    • Continue where you left off
    • Progress by unit and topic
    • Hints that ask questions first

  • Teachers

    • Assign labs to classes
    • See submissions awaiting review
    • Teacher guidance in every lesson

  • School admins

    • Manage users and classes
    • Organization settings
    • Usage across the school

  • Platform admins

    • Multi-school oversight
    • Content publishing
    • Execution service health

Honest roadmap

What this preview does — and does not — do yet

There are no accounts yet, code is not compiled or run, and every dashboard number is labeled demonstration data. Unavailable actions are disabled with an explanation.

  1. Stage 1 · now

    Interface foundation, course map, sample lesson and workspace with demonstration data.

  2. Stage 2

    Supabase authentication, real roles, classes, assignments and saved work in PostgreSQL.

  3. Stage 3

    Java compilation, execution and automated tests in an isolated, resource-limited service.

  4. Stage 4

    A Socratic AI tutor with teacher-controlled assistance levels.