# winterbe/java8-tutorial

Modern Java - A Guide to Java 8

Repository: https://github.com/winterbe/java8-tutorial
Canonical: https://ross.abutalabs.com/products/java8-tutorial
Homepage: http://winterbe.com
Language: Java
License: MIT
License Family: permissive
Topics: java-8, tutorial, lambda-expressions, java, stream, parallel-streams, guide, learning
Last push: 2023-08-11T18:44:34+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4553, "days_push": 1118, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 16724, forks 3990 (observed 2026-08-28T04:11:17.051218+00:00)

## What it is
A popular open-source tutorial repository teaching Java 8 features through short, commented code samples. It covers lambdas, functional interfaces, streams, parallel streams, Optionals, the new Date API, and annotations.

## Use cases
- learn java 8 lambda expressions
- understand java streams api
- tutorial on functional interfaces in java
- learn parallel streams with examples
- java 8 date and time api guide
- refresher on java 8 features

## When to choose
- you want concise, example-driven learning of Java 8 features
- you are onboarding to modern Java from older versions
- you need a quick reference for streams, lambdas, or Optionals

## When to avoid
- you need coverage of Java 17+ features like records or pattern matching
- you want an interactive course with exercises rather than code snippets
- you need a comprehensive Java language reference

## Facets
- artifact type: learning-resource
- maturity: stable
- function: developer-tools
- domain: programming-languages, tutorials
- platform: jvm, cross-platform
- tags: java-8, lambda-expressions, streams, tutorial, code-samples

## Member repositories
- winterbe/java8-tutorial (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:17.051218+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 2026-08-29T17:04:47.056195+00:00, confidence not recorded.
  - readme: https://github.com/winterbe/java8-tutorial (fetched 2026-08-28T04:11:17.051218+00:00, sha 801851a1b22d)
  - homepage: http://winterbe.com (fetched 2026-08-29T08:01:56.524009+00:00, sha eb0275f5264f)
- Data as of 2026-08-30T08:39:29.467469+00:00.