# in28minutes/JavaInterviewQuestionsAndAnswers

Java Interview Questions and Answers

Repository: https://github.com/in28minutes/JavaInterviewQuestionsAndAnswers
Canonical: https://ross.abutalabs.com/products/javainterviewquestionsandanswers
Homepage: https://github.com/in28minutes/learn
Language: Java
License Family: other
Last push: 2023-11-15T00:47:30+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": 3865, "days_push": 1023, "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 1443, forks 957 (observed 2026-08-28T04:04:44.976523+00:00)

## What it is
A curated collection of 200+ Java interview questions and answers covering core Java topics like OOP, strings, collections, and the Java platform. It serves as companion material for an in28Minutes Udemy course and includes code examples and a PDF guide.

## Use cases
- prepare for a Java developer job interview
- review core Java concepts like immutability and inheritance
- practice tricky Java interview questions on wrapper classes and interfaces
- brush up on Java fundamentals before a technical screening
- find explanations for common Java questions like JDK vs JVM vs JRE

## When to choose
- you are preparing for Java interviews and want a question-driven review
- you want free companion material for a structured Java interview course
- you need quick refresher answers on core Java topics

## When to avoid
- you need a comprehensive Java tutorial for learning the language from scratch
- you want up-to-date coverage of modern Java features and releases
- you need production code or a reusable library

## Facets
- artifact type: learning-resource
- maturity: maintenance
- function: developer-tools, documentation
- domain: programming-languages, education, tutorials
- platform: jvm, cross-platform
- tags: java, interview-preparation, interview-questions, learning, study-guide, course-material

## Member repositories
- in28minutes/JavaInterviewQuestionsAndAnswers (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:44.976523+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 2026-08-30T04:36:21.107531+00:00, confidence not recorded.
  - readme: https://github.com/in28minutes/JavaInterviewQuestionsAndAnswers (fetched 2026-08-28T04:04:44.976523+00:00, sha 021bce3d183a)
  - homepage: https://github.com/in28minutes/learn (fetched 2026-08-29T11:46:24.112570+00:00, sha dc99cf3efa38)
- Data as of 2026-08-30T08:39:29.467469+00:00.