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CS++ Java IDE

csplusplus.com

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Spec score 8.0 #6 of 23 in Java IDEs

What it is

CS++ Java IDE lets users write and run Java in a browser without installing a JDK. Its custom interpreter handles most of Java and core standard-library features, including classes, generics, collections, lambdas, and streams. A step-through debugger and clear error messages are included for beginners. The runtime does not support threads, writing files, reflection, enums, records, or switch expressions. The browser IDE works on Chromebooks, iPads, phones, Macs, and Windows PCs, including locked-down school devices. Users can begin without an account; signing in is optional and adds cloud saving across devices. Teachers can share starter code and worked examples by link, and use the IDE for demonstrations and homework. It is aimed at beginners and AP Computer Science A students, with supported topics extending beyond the exam to generics, collections, lambdas, and streams. The free plan supports writing, running, and auto-testing Java in a browser without signup to start. The listed pricing note says paid access starts at $9.99, though no paid plan details are provided here.

Spec sheet

What it does
The Java IDE lets users write and run Java in a browser without installing a JDK.Read 4 Oct 2026 · csplusplus.com
Intended users
The IDE is designed for beginners and AP Computer Science A students, and its supported topics extend beyond the AP CSA exam to generics, collections, lambdas, and streams.Read 4 Oct 2026 · csplusplus.com
Founded
2018Read 28 Sep 2026 · csplusplus.com
Maker
CS++ is published by Yellow Dart Publishing (Kevin P Hare LLC), founded by Kevin Hare in 2018.Read 4 Oct 2026 · csplusplus.com
Classroom use
Teachers can share starter code and worked examples using shareable links and use the IDE for demonstrations and homework.Read 4 Oct 2026 · csplusplus.com
Debugger
It includes a step-through debugger and clear error messages for beginners.Read 4 Oct 2026 · csplusplus.com
Devices
The browser IDE works on Chromebooks, iPads, phones, Macs, and Windows PCs, including locked-down school devices.Read 4 Oct 2026 · csplusplus.com
Founder experience
The maker describes Kevin Hare as an AP Computer Science teacher with more than 20 years in the classroom and a published AP CSP textbook author.Read 4 Oct 2026 · csplusplus.com
Language support
The custom in-browser interpreter supports most of Java and the core of the standard library, including classes, generics, collections, lambdas, and streams.Read 4 Oct 2026 · csplusplus.com
Runtime limits
The interpreter does not support threads, writing files, reflection, enums, records, or switch expressions.Read 4 Oct 2026 · csplusplus.com
Security and privacy
CS++ publishes a privacy policy describing its collection, use, and protection of student and teacher data, cookies, analytics, subprocessors, and privacy rights.Read 4 Oct 2026 · csplusplus.com
Sign-in and saving
Users can start without logging in; signing in is optional and adds cloud save across devices.Read 4 Oct 2026 · csplusplus.com

Plans and prices

CS++ Java IDE Free Free to use Write, run, and auto-test Java in browser · no signup required to start Read 4 Oct 2026 · csplusplus.com

Every CS++ Java IDE plan and price →

Strong points and limits

Strong points

  • Runs in a browser without installing a JDK.
  • Step-through debugger supports beginner learning.
  • Works on phones, tablets, and computers.
  • Can start without an account.
  • Teachers can share starter code by link.

Limits

  • Interpreter does not support writing files.
  • Threads and reflection are unsupported.
  • Enums, records, and switch expressions are unsupported.
  • No free trial is listed.

Who it suits

The IDE suits beginners and AP Computer Science A students who need a browser-based place to write and run Java. Teachers may find its shareable starter code useful for demonstrations and homework.

Verdict

CS++ provides a browser-based Java environment with beginner-oriented debugging and classroom sharing. Its interpreter has clear feature limits, so users should check that their coursework or projects avoid unsupported Java capabilities.

Where Specifiction places it

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