Java Editor
Write, edit and manage Java code online. Copy or download your code and run it locally.
Frequently Asked Questions
What is the Online Java Editor?
It is a free online tool to draft, format, check, and download Java source code files without needing a local JDK installation.
Does this editor run Java code on a server?
All editing, formatting, and file exports are handled completely in the browser. Code is saved in local browser memory and never uploaded to remote servers.
Can I compile and run complex Java projects here?
This editor is a single-file scratchpad designed for learning, logical validation, and code drafting. It does not support multi-module maven/gradle projects.
Can I import external JAR libraries?
No. The editor is optimized for standard Java SDK libraries and classes. External dependencies or jar archives cannot be loaded.
How should I structure the main class?
Keep class structures clean and use standard syntax rules (e.g. `public class Main` with a `public static void main(String[] args)` method).
How do I download my Java code?
Click the "Download" button to save your code block as a standard `.java` file on your computer.
Does this editor support Java 21+ features?
You can write and format Java 21 code cleanly, but advanced compilation checks are limited to standard, client-safe Java syntax libraries.
Is my Java code confidential?
Yes, completely. Because no compiler server is involved, your code remains inside your local browser sandbox.