Online Java Editor

A browser-based editor to write, compile, and run Java programs in a safe sandbox with immediate output and error reporting for learners and developers.

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About This Tool

This tool provides a browser-based environment to write, compile, and run Java programs in a safe sandbox. It targets students, teachers, and developers who want quick feedback on small code examples without local JDK installation.
The backend compiles Java source using javac and runs the resulting class in an isolated process, capturing stdout and stderr and reporting execution time. It supports Java 8, 11, and 17, with version selection to match curricula.
Core value lies in safe isolation, deterministic results, and reproducible outputs for simple experiments, tutorials, and algorithm validation. The system is designed for quick iterations: paste code, choose version, run, and inspect results.
While it cannot replace a full IDE, it provides a reliable, repeatable runtime environment that reduces setup friction for classroom and lightweight development workflows.

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How to Use

Provide inputs: paste Java source into the code field and configure optional run_args, classpath, and class_name.
Choose Java version and runtime options to match your scenario.
Run program: initiate compilation and execution in the sandbox.
Review outputs: examine stdout, stderr, exit_code, and execution_time_ms.
Iterate: fix compilation or logic errors and re-run as needed.

Frequently Asked Questions

Find Quick Answers

Which Java versions are supported?

Supported versions include Java 8, 11, and 17. The sandbox compiles and runs code with the selected version, ensuring feature parity with classroom or project requirements. Updates may extend version support over time.

Can I use external libraries or multiple files?

The environment is designed for single-file source testing with access to standard Java libraries. External dependencies via Maven/Gradle or multi-file/module projects are not supported in this sandbox.

What outputs are provided and how are errors shown?

Both stdout and stderr are captured and displayed. The result includes exit_code and execution_time_ms. Compilation errors appear in stderr, and runtime exceptions show stack traces in stderr as well.

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