Java

Java was originally developed as an alternative to the C/C++ programming languages. It is now mainly used for building web, desktop, mobile, and embedded applications. Java is owned and licensed through Oracle, with free and open source implementations available from Oracle and other vendors.

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Created by James Gosling
Released May 23, 1995

Repositories 81,444

CyC2018 / CS-Notes

70k

📚 Tech Interview Guide 技术面试必备基础知识、Leetcode 题解、Java、C++、Python、后端面试、操作系统、计算机网络、系统设计

algorithm leetcode interview computer-science system-design java python cpp

Java Updated Jul 4, 2019

iluwatar / java-design-patterns

48.9k

Design patterns implemented in Java

java principles design-patterns awesome-list snippets snippets-collection snippets-library

Good first issues

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Dirty Flag pattern Issue

good first issue enhancement

#883 opened about 1 month ago by sajankumarma

Wrong UML in observer

good first issue enhancement

#875 opened 3 months ago by andreazube

SonarQube reports bugs

good first issue technical

#819 opened 8 months ago by iluwatar

Java Updated Jul 7, 2019

Snailclimb / JavaGuide

47.4k

【Java学习+面试指南】一份涵盖大部分Java程序员所需要掌握的核心知识。

java jvm interview redis spring mysql zookeeper algorithms system system-design

Java Updated Jul 8, 2019

elastic / elasticsearch

42.4k

Open Source, Distributed, RESTful Search Engine

elasticsearch java search-engine

Good first issues

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Add explanation of relocating shard state.

>docs good first issue :Core/Features/CAT APIs

#43244 opened 24 days ago by kat257

Add null check for ParentJoinFieldMapper in ChildrenAggregationBuilder.joinFieldResolveConfig

good first issue :Analytics/Aggregations

#42997 opened about 1 month ago by ebadyano

MTermVector Java High Level Client Misses Fields Property

good first issue :Core/Features/Java High Level REST Client

#42232 opened about 2 months ago by bisztray

Java Updated Jul 8, 2019

spring-projects / spring-boot

39.8k

Spring Boot

java spring-boot spring framework

Good first issues

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Document that the shutdown endpoint is not intended for use when deploying a war to a servlet container

type: documentation

#17398 opened 6 days ago by membersound

Multi-page reference documentation uses the single-page index

type: documentation

#17263 opened 19 days ago by wilkinsona

Clarify file extensions that are supported for application property files

type: documentation

#17241 opened 20 days ago by swamikevala

Java Updated Jul 8, 2019

ReactiveX / RxJava

39.7k

RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observ…

java rxjava flow reactive-streams

Good first issues

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What's Different in 3.x (tracking issue)

Documentation 3.x

#6515 opened 19 days ago by akarnokd

Update wiki to reflect 2.x (tracking issue)

Documentation 2.x

#6132 opened 11 months ago by akarnokd

2.x: Flowable missing or incorrect marbles (tracking issue)

Documentation 2.x

#5813 opened over 1 year ago by akarnokd

Java Updated Jul 8, 2019

kdn251 / interviews

35.9k

Everything you need to know to get the job.

Java Updated Jun 25, 2019

square / okhttp

33.3k

An HTTP client for Android, Kotlin, and Java.

java android kotlin

Good first issues

See all

Wiki page all about caching

documentation

#4637 opened 5 months ago by swankjesse

Unnecessary call to KeyManagerFactory.init in CustomTrust recipe

documentation

#4370 opened 8 months ago by uce

ConnectionPool cleanup is eager and results in unnecessary connection churn and (potentially) port exhaustion

documentation enhancement

#4354 opened 8 months ago by nicktrav

Java Updated Jul 8, 2019

square / retrofit

33k

Type-safe HTTP client for Android and Java by Square, Inc.

java android

Good first issues

See all

duplicate class when using recommended protobuf-lite

Documentation

#2954 opened 8 months ago by beigirad

Question: Do I need to close ResponseBody?

Documentation

#2950 opened 8 months ago by Malachiasz

Retrofit 2 Close ErrorResponse Body

Documentation

#2929 opened 9 months ago by paourissi

Java Updated Jul 8, 2019

google / guava

32.5k

Google core libraries for Java

guava java

Java Updated Jun 30, 2019

PhilJay / MPAndroidChart

27.8k

A powerful 🚀 Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick chart…

java chart graph android

Java Updated Jun 24, 2019

apache / dubbo

27.7k

Apache Dubbo is a high-performance, java based, open source RPC framework.

dubbo rpc rpc-framework java high-performance soa service-oriented service-registration distributed-systems service-discovery cluster spring service-consumer service-provider service-registry microservices

Good first issues

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why don't the attributes of @Reference annotation contains the 'merge' attribute?

good first issue

#3370 opened 5 months ago by LX1993728

The Document about dubbo consumer setting not updated

good first issue

#3025 opened 7 months ago by 9526xu

The official document has not been updated

good first issue help wanted

#3012 opened 7 months ago by liugdxd

Java Updated Jul 8, 2019

doocs / advanced-java

24.4k

😮 互联网 Java 工程师进阶知识完全扫盲：涵盖高并发、分布式、高可用、微服务等领域知识，后端同学必看，前端同学也可学习

Good first issues

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Doocs 微信交流群 | Wechat group for Doocs

good first issue

#70 opened about 1 month ago by yanglbme

【开源项目维护】一起吗？

good first issue help wanted

#61 opened 3 months ago by yanglbme

欢迎加入 Doocs 开源组织 | Welcome to join the Doocs Open Source organization

good first issue notice

#44 opened 5 months ago by yanglbme

Java Updated Jul 6, 2019

square / leakcanary

23.1k

A memory leak detection library for Android

android memory-leak java kotlin kotlin-android outofmemory outofmemoryerror

Good first issues

Add footer for feedback

type: documentation

#1444 opened 2 days ago by pyricau

Write a Java only sample

type: documentation status: help wanted

#54 opened about 4 years ago by pyricau

Kotlin Updated Jul 8, 2019

zxing / zxing

23k

ZXing ("Zebra Crossing") barcode scanning library for Java, Android

java android barcode barcode-scanner zxing qr-code datamatrix upc

Java Updated Jul 4, 2019

crossoverJie / JCSprout

21.4k

👨‍🎓 Java Core Sprout : basic, concurrent, algorithm

java concurrent-programming algorithm basic-java netty jvm

Java Updated Jul 3, 2019

skylot / jadx

19.2k

Dex to Java decompiler

android dex java decompiler

Java Updated Jul 8, 2019

alibaba / fastjson

18.3k

🚄 A fast JSON parser/generator for Java. (Aliyun Data Lake Analytics https://www.aliyun.com/product/datalakeanalytics …

fastjson java android json json-parser json-serialization json-serializer serialization deserialization best-performance

Java Updated Jul 5, 2019

macrozheng / mall

17.3k

mall项目是一套电商系统，包括前台商城系统及后台管理系统，基于SpringBoot+MyBatis实现。前台商城系统包含首页门户、商品推荐、商品搜索、商品展示、购物车、订单流程、会员中心、客户服务、帮助中心等模块。后台管理系统包…

spring-boot spring-security mybatis docker swagger-ui mysql redis elasticsearch mongodb elk spring rabbitmq spring-cloud java springcloud springboot

Java Updated Jul 8, 2019

ityouknow / spring-boot-examples

17k

about learning Spring Boot via examples. Spring Boot 教程、技术栈示例代码，快速简单上手教程。

Java Updated May 18, 2019

microsoft / CNTK

16.3k

Microsoft Cognitive Toolkit (CNTK), an open source deep-learning toolkit

cognitive-toolkit cntk deep-learning machine-learning deep-neural-networks neural-network distributed python c-plus-plus c-sharp java

C++ Updated Jul 6, 2019

libgdx / libgdx

15.6k

Desktop/Android/HTML5/iOS Java game development framework

libgdx java game cross-platform android ios html5 windows linux macosx 2d 3d framework

Good first issues

[HTML/GWT] Input.isKeyPressed Always TRUE If Release Occurs Outside of LibGDX Context

good first issue bug

#5134 opened over 1 year ago by villain-bryan

Tooltips broken on Android

good first issue help wanted

#4924 opened over 1 year ago by Dakror

Java Updated Jul 6, 2019

TheAlgorithms / Java

15.4k

All Algorithms implemented in Java

java algorithms implementation algorithms-implemented algorithms-datastructures algorithm-challenges wiki reference

Java Updated Jul 7, 2019

Wechat-Group / WxJava

15.3k

WxJava （微信开发 Java SDK），支持包括微信支付、开放平台、小程序、企业微信/企业号和公众号等的后端开发

weixin wechat weixin-sdk wechat-sdk java sdk cp mp wxpay wxjava miniapp miniprogram open weapp

Forked from chanjarster/weixin-java-tools Java Updated Jul 8, 2019

SeleniumHQ / selenium

14.9k

A browser automation framework and ecosystem.

selenium webdriver java ruby python javascript dotnet

Good first issues

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Documentation on how to produce Geckodriver trace level logs using the Node bindings missing

C-docs C-nodejs

#6219 opened 11 months ago by motin

How do you write short-hand syntax of By.js?

C-docs C-nodejs

#5352 opened over 1 year ago by NakajimaTakuya

Documentation snippet for Javascript doesn't work

C-docs C-nodejs

#5339 opened over 1 year ago by mercmobily

Java Updated Jul 8, 2019

alibaba / arthas

14.3k

Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas

java agent trace jvm arthas trouble-shooting diagnosis classloader alibaba

Java Updated Jul 8, 2019

jhipster / generator-jhipster

14.1k

Open Source application generator for creating Spring Boot + Angular/React projects in seconds!

angular spring-boot webpack java docker yeoman-generator generator react kubernetes cloud

Good first issues

See all

Frontend Enums should be global

status: good first issue $$ bug-bounty $$

#9920 opened 23 days ago by amatosg

Add Redis support for Spring cache abstraction

status: good first issue $$ bug-bounty $$

#9280 opened 5 months ago by Tcharl

jhipster kubernetes doesn't generate keycloak yaml

status: good first issue $$ bug-bounty $$

#8143 opened 11 months ago by dkirrane

JavaScript Updated Jul 8, 2019

android10 / Android-CleanArchitecture

13.6k

This is a sample app that is part of a series of blog posts I have written about how to architect an android applicat…

android-cleanarchitecture architectural java android-application android android-development android-architecture

Java Updated Aug 30, 2018

google / ExoPlayer

13.5k

An extensible media player for Android

android mediaplayer java exoplayer

Java Updated Jul 5, 2019

jenkinsci / jenkins

13.3k

Jenkins automation server

continuous-integration continuous-delivery continuous-deployment java groovy jenkins pipelines-as-code devops hacktoberfest cicd

Java Updated Jul 8, 2019

Learn about java

Website: www.oracle.com/technetwork/java/javase/overview/index.html
Wikipedia: Wikipedia

Java

Repositories 81,444

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Good first issues

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Good first issues

Good first issues

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