# qcha/JBook

Алгоритмы, паттерны, подготовка к собеседованиям, статьи и материалы по Java

Repository: https://github.com/qcha/JBook
Canonical: https://ross.abutalabs.com/products/jbook
License Family: other
Topics: book, java, algorithms, russian, knowledgebase, articles, free, education, good-practices, jvm-languages, educational-project, educational, cookbooks, code-reviews, frameworks, interview-practice, interview-preparation, interview-questions
Last push: 2026-07-04T18:14:47+00:00

## Health v2 (maintenance only)
Score: 73/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 90, release rhythm 35, longevity 100
- inputs: {"age_days": 3544, "days_push": 60, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1224, forks 165 (observed 2026-08-28T04:04:02.797927+00:00)

## What it is
A free, open-source knowledge base (book) covering Java algorithms, design patterns, code review practices, and interview preparation materials, written in Russian. It is an ongoing educational project by a single author with community contributions.

## Use cases
- prepare for a Java developer interview
- learn algorithms and data structures in Java
- study Java design patterns and good practices
- find free Java learning materials in Russian
- review common Java interview questions
- systematize Java knowledge before job hunting

## When to choose
- you are a Russian-speaking developer learning Java or preparing for interviews
- you want a free, community-driven reference on Java algorithms and patterns
- you prefer curated articles over scattered blog posts

## When to avoid
- you need up-to-date documentation for a specific Java framework version
- you require materials in a language other than Russian
- you need a formally published, peer-reviewed textbook

## Facets
- artifact type: learning-resource
- maturity: active
- function: documentation, developer-tools
- domain: education, programming-languages, tutorials
- platform: jvm, cross-platform
- tags: java, interview-preparation, algorithms, design-patterns, russian-language, knowledge-base, free-education

## Member repositories
- qcha/JBook (main) score 73

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:02.797927+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:15:29.027458+00:00, confidence not recorded.
  - readme: https://github.com/qcha/JBook (fetched 2026-08-28T04:04:02.797927+00:00, sha 6542a1237dd0)
- Data as of 2026-08-30T08:39:29.467469+00:00.