Learn Java: Code & Compiler

Master Java the practical way, from your first "Hello, World" to threads and the JVM.

Learn Java teaches the language step by step with clear lessons, runnable code and an AI tutor that answers your questions the moment you get stuck.

📚 Structured Java lessons
Work through Subject to Topic to Subtopic, each with Theory, Guided Practice and a Quick Summary. Cover variables and data types, control flow, methods, classes and objects, inheritance, interfaces, the Collections framework, generics, exception handling, lambdas and streams, multithreading, and how the JVM compiles and runs your code. Plain-English explanations sit next to syntax-highlighted snippets you can run instantly.

💻 Real Java compiler
Write and execute Java straight from your phone in the built-in editor and online runner. Tackle coding problems with hidden test cases and reference solutions, and let the AI check your output. The same runner also supports Python, Kotlin, C++, C, Go, Rust, JavaScript, Dart and Swift.

🧠 Quizzes and tests
Sharpen your skills with multiple-choice quizzes that climb from Easy to Medium to Hard. Every answer comes with an explanation, and weak topics get flagged. Take timed mock tests that blend theory, MCQs and coding tasks, then read result analytics with improvement tips. Review your quiz history and re-attempt anything.

🤖 Smart Mentor AI tutor
Ask anything about Java syntax or errors, get lesson-aware help, practise in mock-interview mode, or snap a photo of code or a diagram for instant feedback. Generate a 7-day study plan covering review, coding practice and interview prep.

📊 Track your progress
See scores over time, study minutes, completed topics and weak areas. Build streaks with daily goals, a check-in quiz and an AI revision card, and climb global and per-subject leaderboards.

🌐 Anywhere, any way
Study offline, switch between light and dark themes, and read the interface in English, Hindi, Kannada, Tamil or Telugu while code and technical terms stay intact. Stay current with the Today's Updates tech feed.

Free vs Pro
Free gives you starter topics, daily practice and limited AI help. Pro unlocks every topic, all difficulty levels, unlimited practice, full history, custom topic tests and higher AI limits. Choose a 6-month prepaid plan or an auto-renewing monthly plan, and start with a free trial.

Java and related names and logos are trademarks of their respective owners. This app is independent and is not affiliated with, endorsed by, or sponsored by them.