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Standard, modern and elegant coding hub for Java, Spring, Hibernate, Kafka, SQL and Kong. Every topic shows the input code beside its real output — and now you can run it yourself: write and execute Java in our built-in Online Java Compiler, or spin up a live REST API with the API Sandbox.

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Two free tools, right in your browser.

Online Java Compiler

Write, compile and run Java right in your browser — records, streams, collections and more, with instant console output. No setup, no install.

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API Sandbox

Generate a Spring Boot project, run it live, and get a shareable REST API URL. Test your endpoints from the browser or Postman — a real, temporary API in seconds.

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