☕ Java Playground

Write Java code below and click Run. Everything runs in your browser — nothing is sent to our servers. No signup, no install, no nonsense.

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Java can't run inline (yet)

Some languages need a real compiler or runtime that doesn't fit in a browser. But you can run Java instantly on these free platforms:

Open in Replit ↗ Open in OneCompiler ↗

Sample Java code:

Java example

// Spring Boot REST endpoint
@GetMapping("/users/{id}")
public User getUser(@PathVariable Long id) {
    return userService.findById(id)
        .orElseThrow(() ->
            new NotFoundException("User not found"));
}

Try these Java examples

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A note on this playground

Code runs in your browser using open-source engines (Pyodide for Python, native JS for JavaScript, AlaSQL for SQL). Nothing is sent to OneCity's servers. No accounts, no tracking. If you save your work, copy-paste it somewhere else — refreshing the page resets the editor.