How to Use Java Playground
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1. Write Java Code
Type your Java program. The entry point must be a public class named Main with a main() method.
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2. Compile and Run
Click Run or press ⌘↵. Judge0 compiles with javac and executes with the JVM.
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3. View Output
System.out.println() output and compiler errors appear in the Output panel.
The Technical Details
This interactive web utility provides fast, reliable, and completely private data transformations. In modern workflows, quick formatting, conversions, or estimations are essential. By running all logic entirely in your browser with client-side JavaScript, this tool guarantees that your data never leaves your machine. This approach delivers maximum performance and absolute data privacy, as no information is ever sent to a server.
Frequently Asked Questions
Which Java version is used?
Java 17 (OpenJDK) on the Judge0 CE sandbox.
Does my class need a specific name?
Yes. The public class must be named Main so the compiler can locate the entry point.
Can I use Maven or external JARs?
No. Only the Java standard library (java.util, java.io, java.lang, etc.) is available.
Is my code private?
Code is submitted to the public Judge0 CE API. Avoid pasting sensitive data.