# JavaForge: Java Interview — Blind75 · System Design · STAR

> Blind75 · System Design · STAR (iPhone/iPad app by YIFENG JIA.)

- Source: https://appshunter.io/ios/app/javaforge-java-interview/id6770013304 (this page in markdown: same URL + `.md`)
- Developer: [YIFENG JIA](https://appshunter.io/developer/1869839015)
- Category: Education, Reference
- Price: $1.99 (on sale, was $2.99)
- Age rating: 4+
- Requires: iOS 17.6 · 6 MB
- Languages: American English
- Released: 2026-05-18
- Data updated: 2026-08-23
- User reviews in markdown: https://appshunter.io/ios/app/javaforge-java-interview/id6770013304/reviews.md

## What is JavaForge?

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.


## Version history (last 1 release)

### 1.0 — 2026-05-19

No release notes.

## More apps by YIFENG JIA

- [SmartyPrep: NAPLAN Year 3](https://appshunter.io/ios/app/smartyprep-naplan-year-3/id6757944675)
- [Java Features](https://appshunter.io/ios/app/java-features/id6760608367)
- [Ripen — Pomodoro Orchard](https://appshunter.io/ios/app/ripen-pomodoro-orchard/id6770152456)

All apps by YIFENG JIA: https://appshunter.io/developer/1869839015

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*