Java Features
Every Java Feature. One Place.
Free · Designed for iPad. Not verified for macOS.
From Lambdas to Virtual Threads — every Java feature from 8 to 25, with deep interview prep, quizzes, and flashcards. The reference that also drills you.
THE JAVA REFERENCE FOR DEVELOPERS WHO ACTUALLY SHIP
Every Java feature from Java 8 through Java 25 — 70+ features — in one sharp, no-fluff app. Built for backend engineers, interview preppers, and anyone tired of grepping release notes.
WHAT'S INSIDE
- 70+ features covering Java 8 through Java 25 (LTS)
- Lambda, Streams, Optional and every Java 8 fundamental
- Records, Sealed Classes, Pattern Matching — the modern ADT trio
- Virtual Threads, Structured Concurrency, Scoped Values
- Preview and Incubator features clearly marked, with a status legend
- Direct links to the official JEP and Oracle docs for every feature
LEARN MODE
- Flashcards: flip-card study across every feature
- Quiz: 10/15/20-question rounds with version, status, JEP-match, and hand-written trap questions. Tracks high score and best streak.
- Interview Prep: deep prep content for 22 of the most-asked Java interview topics. Every topic breaks into why it matters, real question phrasings, key points, common traps, follow-up escalations, and a whiteboard-ready code snippet.
DAILY USE
- Filter by version (Java 8 to 25, LTS, or Experimental)
- Category filter and full-text search
- Bookmarks: save any feature for later
- Changelog: browse what shipped in each version range
- Share card: export any feature as an image for your team chat
- Reading progress tracker
CODE EXAMPLES (PRO)
Unlock syntax-highlighted code examples for every feature with a single one-time purchase. No subscription.
DESIGN
Built with a brutalist, high-contrast aesthetic — no rounded corners, no gradients, just dense information and sharp borders. Designed to be glanceable at a glance and deep when you need it.
Written in native SwiftUI. Fast. Offline. No tracking.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
QUIZ MODE + INTERVIEW PREP
Two major additions for developers actually prepping for the job:
• QUIZ — 10/15/20-question rounds pulled from every feature. Version, status, JEP-match, and hand-written trap questions. Tracks high score and best streak.
• INTERVIEW PREP — Deep-researched prep for 22 of the most-asked Java interview topics (Streams, Optional, Records, Sealed Classes, Pattern Matching, Virtual Threads, CompletableFuture, and more). Every topic breaks down into:
– Why interviewers keep asking it
– Real question phrasings
– Must-know technical facts
– Common traps candidates fall into
– Follow-up escalations seniors get
– A whiteboard-ready code snippet
Also in this release:
• Unified LEARN hub (Flashcards + Quiz + Interview Tips)
• Cleaner single-line header
• Category filter merged into search
• New version-history icon
• Share-feature card for social
• Reading progress tracker
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
- 5.9 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 18.5 or later.
- iPhone
Requires iOS 18.5 or later. - iPad
Requires iPadOS 18.5 or later. - Mac
Requires macOS 15.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.5 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 YIFENG Jia