Compiler

Run Java reference snippets in a free sandbox.

Paste any example from the reference or lessons, wrap it in a main method if needed, and execute instantly using the Piston API (Java 17, no API key).

Sandbox

Run Java reference snippets

Uses the free Piston sandbox (Java 17). No API key required.

Java source (Main.java)

STDIN (optional)

Output

Run code to see output.

Notes

Runs on the Piston public sandbox (Java 17, no key).
Wrap snippets from the reference page in a full class with a main method before running.
Programs time out or fail if they use networking or long-running loops.