Compiler

Test Java code without leaving the lesson flow.

Paste examples from lessons or the reference, run them in the browser, and inspect input and output side by side.

Java compiler

Run Java in the browser

Write a complete `Main.java` file, run it, and inspect the output without leaving the page.

Main.java

STDIN

Output

Run code to see a larger output panel here.

Notes

Use a full `public class Main` wrapper for snippets.
Input goes into the STDIN box if your program uses `Scanner`.
The runner uses a free hosted sandbox, so network access and long-running programs are restricted.

Readability

The output panel now gets full width and larger type so longer console output is easier to scan during lessons and quick experiments.