Does it compile Java locally?

Yes. Java compiles and runs on your device — no internet or server needed.

Can I see System.out.println output?

Yes. All output from System.out and System.err appears in the built-in console immediately after running your program.

Are there example programs?

Yes. Pre-loaded Java examples cover OOP, loops, arrays, collections, sorting, and more. Great for learning or reference.

Is it good for students?

Absolutely. Java Editor & Runner is built for learning — clean editor, instant feedback, and real examples to study.

Java & Kotlin Compiler IDE — Write and run Java on your phone.

Home/Apps/Java & Kotlin Compiler IDE

Java & Kotlin Compiler IDE

Code Editor★ 4.4 (18)1K+ downloadsby Cosmovex

Write and run Java on your phone.

A Java IDE for Android that compiles and runs Java code on-device. Syntax highlighting, built-in console output, offline execution, and example programs to get started fast.

On-Device JavaNo Internet NeededBuilt-In ConsoleExample Programs

Download on Google Play Privacy Policy

About Java & Kotlin Compiler IDE

Java Editor & Runner brings a real Java development environment to your Android phone. Write Java code with full syntax highlighting, tap Run, and see your program's output in the built-in console — all offline. No laptop required, no cloud compilation. Whether you're a student learning Java, reviewing algorithms on the go, or practicing for an interview, Java Editor & Runner gives you a complete Java environment that fits in your pocket. Pre-loaded Java examples cover classes, loops, arrays, OOP basics, and standard library usage so you can start learning from day one.

Screenshots

See it in action

Features

Everything You Need

On-Device Java Execution

Compile and run Java programs directly on your Android device. No server, no internet, no cloud. Your code executes locally with real output.

Syntax Highlighting

Full Java syntax highlighting for keywords, types, strings, comments, and annotations. Clean dark editor optimized for mobile reading.

Built-In Console

System.out.println output, compile errors, and runtime exceptions all appear in the integrated console. Debug your code without leaving the app.

Java Example Programs

Pre-loaded examples covering Hello World, OOP basics, loops, arrays, ArrayList, HashMap, sorting algorithms, and more. Run and study real Java code.

Offline & Private

All compilation and execution happens on your device. No network requests, no code sent to any server. Your programs stay private.

Mobile-Optimized Editor

Coding toolbar with Java-specific symbols ({}, (), [], ;, .), adjustable font size, and a clean layout that makes writing code on a phone feel natural.

Ready to Try Java & Kotlin Compiler IDE?

Free to download. No account required. Available on Android.

Google Play

FAQ

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Cosmovex

Java & Kotlin Compiler IDE

About Java & Kotlin Compiler IDE

See it in action

Everything You Need

On-Device Java Execution

Syntax Highlighting

Built-In Console

Java Example Programs

Offline & Private

Mobile-Optimized Editor

Ready to Try Java & Kotlin Compiler IDE?

Frequently Asked Questions

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