# Z2Y Java Principles — Helping You Understand Java.

> Helping You Understand Java. (iPhone/iPad app by 洁 欧阳.)

- Source: https://appshunter.io/ios/app/z2y-java-principles/id6504158005 (this page in markdown: same URL + `.md`)
- Developer: [洁 欧阳](https://appshunter.io/developer/1715570257)
- Category: Utilities, Education
- Price: $1.99
- Age rating: 4+
- Requires: iOS 15.6 · 257 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2024-06-12
- Data updated: 2026-08-02
- User reviews in markdown: https://appshunter.io/ios/app/z2y-java-principles/id6504158005/reviews.md

## What is Z2Y Java Principles?

Here, you can learn the principles of Java and its related knowledge for work, creation, and interviews, among other purposes.

Use the system to track and manage your learning, and add notes at any time, making it easy to secure an offer.

Future updates will include: adding local & online bookmarks, learning report statistics, learning plan reminders; the default knowledge base content will be continuously updated!!


## Version history (last 5 releases)

### 1.2.32 — 2026-08-01

Improved compatibility and updated the product page to better describe Java core concepts, learning progress, and interview review workflows.

### 1.2.31 — 2026-07-27

Fixed an issue where the GitHub login sheet could reappear on iOS and its close button could not be tapped. Refreshing Java content now replaces stale local content and hides empty duplicate directories such as JDK 2.

### 1.2.30 — 2026-07-22

A refreshed mobile learning experience with improved topic browsing and card-based reading, new shortcuts to recent reading and learning progress, an updated built-in Java knowledge base, and bug fixes.

### 1.2.25 — 2026-07-13

Updated the built-in Java knowledge base, improved learning navigation, recent-reading shortcuts, and progress tracking, refreshed the interface, and fixed bugs.

### 1.1.2 — 2025-08-17

bug fix

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## More apps by 洁 欧阳

- [Z2Y Force Remember Words](https://appshunter.io/ios/app/z2y-force-remember-words/id6743989782)
- [Z2Y Remember Timer](https://appshunter.io/ios/app/z2y-remember-timer/id6747674764)
- [Z2Y Goals](https://appshunter.io/ios/app/z2y-goals/id6749314218)

All apps by 洁 欧阳: https://appshunter.io/developer/1715570257

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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 2026-08-02.*