Data Structures & Algo in Java

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About this app

Crack your next coding interview by mastering Data Structures and Algorithms the way it is really tested: in Java.

This app turns dense DSA theory into bite-sized, hands-on practice. Learn the idea, run the code, then prove it on real problems.

📚 Structured DSA lessons
Work through arrays, strings, linked lists, stacks, queues and hashing, then climb to trees, graphs, heaps and tries. Each subtopic gives clear theory, guided practice and a quick summary, with plain-English explanations of recursion, sorting, searching, greedy techniques and dynamic programming. Time and space complexity (Big-O) is broken down for every approach.

💻 Built-in Java code runner
Write and execute Java right inside the app. Tackle coding problems backed by hidden test cases and reference solutions, and let the AI verify your output. The compiler also supports Python, C++, C, Go, JavaScript, Kotlin, Rust, Dart and Swift when you want to compare.

🧠 Quizzes and mock tests
Sharpen recall with multiple-choice quizzes that step from Easy to Medium to Hard, each answer fully explained. Take timed mock tests blending theory, MCQ and coding questions, with result analytics, weak-topic flags and improvement tips.

🤖 Smart Mentor AI tutor
Ask anything about a sliding-window trick or a tree traversal, get lesson-aware help, run a mock-interview session, or snap a photo of code or a diagram for instant feedback. Generate a 7-day study plan covering concept review, problem solving and interview practice.

📊 Track your progress
Watch scores trend over time, log study minutes, build streaks and hit daily goals. A daily check-in quiz and AI revision card keep momentum, while leaderboards add friendly competition.

🌐 Built for everyone
Works offline, ships with light and dark themes, and offers a multi-language interface (English plus Hindi, Kannada, Tamil and Telugu) that keeps code and technical terms intact during translation. A Tech Updates feed keeps you current.

Free vs Pro
Free gives you starter topics, daily practice and limited AI help. Pro unlocks every topic and difficulty, unlimited problem solving and quizzes, full quiz 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.

Whether you are prepping for FAANG-style rounds, campus placements or simply leveling up your problem-solving, DSA in Java is your daily training ground.

Java is a trademark of its respective owner. This app is independent and is not affiliated with, sponsored or endorsed by any trademark holder.

What’s new

🎯 Daily Knowledge Check — A quick 10-question check opens once a day to test.

🧩 Knowledge Check Corner — New home shortcuts for Quick Test, Practice Quiz & Daily Revision.

✅ Answers & Explanations — Clear explanation right after you pick an option in quizzes.

🔓 All Quiz Levels Open — Explore every difficulty level and start any one you like.

📰 Smarter News & Updates — Home shows the 5 most-read stories.