JavaForge: Java Interview
Blind75 · System Design · STAR
$1.99 · Designed for iPad. Not verified for macOS.
v1.0 — Blind 75, System Design, Core Java, Spring, and 20 behavioral questions. All offline, no ads, no tracking. Five minutes a day.
A no-nonsense Java interview prep app for backend engineers. Fully offline. Zero ads. Zero tracking.
JavaForge bundles Blind 75, System Design, Core Java, the Spring ecosystem, and behavioral questions into a pocket coach you can pull out on the train, at lunch, the night before an onsite.
WHAT YOU GET
▸ Blind 75 — 75 classic coding problems
Organized by Array / Binary / DP / Graph / Interval / Linked List / Matrix / String / Tree / Heap. Each problem ships with:
- Step-by-step approach (brute force → optimal → edge cases)
- Complete Java solution (ready to read or rewrite from memory)
- Time / Space complexity
- Gotchas that catch most candidates
▸ System Design — high-frequency designs
URL shortener, design Twitter, ride-hailing dispatch, messaging, recommendations — broken down into requirements → capacity estimation → high-level architecture → component details → trade-offs.
▸ Core Java — the three hot spots
Collections, Concurrency, the JVM. HashMap internals, ConcurrentHashMap's evolution, the Java memory model, G1 vs CMS garbage collection.
▸ Spring · Boot · Data
IoC, AOP, Spring Data JPA, Spring Security — concepts and high-frequency interview questions.
▸ Behavioral — 20 STAR-method questions
Fully editable answer templates. Pre-polish your "Tell me about a time…" stories into STAR shape so you don't freeze on the day.
WHY JAVAFORGE
Fully offline — works on airplane mode
Daily Review — surfaces what you flagged for review, tracks your streak
Visible progress — every module shows how far you've come
Privacy-first — no accounts, no network, no data collection
Distraction-free — no ads, no social pressure, no gamification gimmicks
Open the app. Hit Daily Review. Five minutes a day adds up.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, YIFENG JIA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- YIFENG JIA
- Size
- 6.3 MB
- Category
- Education
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Yifeng Jia
