{"id":15020395,"url":"https://github.com/notfound9/interviewguide","last_synced_at":"2025-05-14T20:08:55.814Z","repository":{"id":37524316,"uuid":"56664648","full_name":"NotFound9/interviewGuide","owner":"NotFound9","description":"推荐免费ChatGPT网站：https://www.lintcode.com/chat-gpt?utm_source=tf-github-NotFound  点此领取7天VIP会员：https://www.lintcode.com/vip/activity/z1qgMH           《大厂面试指北》——包括Java基础、JVM、数据库、mysql、redis、计算机网络、算法、数据结构、操作系统、设计模式、系统设计、框架原理。","archived":false,"fork":false,"pushed_at":"2023-08-07T06:26:02.000Z","size":62214,"stargazers_count":3949,"open_issues_count":14,"forks_count":684,"subscribers_count":86,"default_branch":"master","last_synced_at":"2025-04-13T15:59:09.242Z","etag":null,"topics":["algorithms","backend","code-interview","data-structures","guide","interview","interview-practice","interview-preparation","interview-questions","interviews","java","java-interview","jvm","leetcode","leetcode-java","mysql","redis","spring","star","system-design"],"latest_commit_sha":null,"homepage":"https://juejin.cn/user/430664288569453","language":"Java","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/NotFound9.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null}},"created_at":"2016-04-20T07:17:09.000Z","updated_at":"2025-04-09T10:35:15.000Z","dependencies_parsed_at":"2022-07-10T04:17:03.262Z","dependency_job_id":"b2e0d0e4-8fdc-4f1e-872c-01ad67a13e55","html_url":"https://github.com/NotFound9/interviewGuide","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/NotFound9%2FinterviewGuide","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/NotFound9%2FinterviewGuide/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/NotFound9%2FinterviewGuide/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/NotFound9%2FinterviewGuide/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/NotFound9","download_url":"https://codeload.github.com/NotFound9/interviewGuide/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":254219373,"owners_count":22034397,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["algorithms","backend","code-interview","data-structures","guide","interview","interview-practice","interview-preparation","interview-questions","interviews","java","java-interview","jvm","leetcode","leetcode-java","mysql","redis","spring","star","system-design"],"created_at":"2024-09-24T19:55:01.931Z","updated_at":"2025-05-14T20:08:55.763Z","avatar_url":"https://github.com/NotFound9.png","language":"Java","readme":"\n# 《大厂面试指北》\n\n最佳阅读地址：http://notfound9.github.io/interviewGuide/\n\nGithub项目主页：https://github.com/NotFound9/interviewGuide\n\n作者博客地址：https://juejin.im/user/5b370a42e51d4558ce5eb969\n\n## 为什么要做这个开源项目？\n\n之前在业余时间阅读技术书籍时，发现只阅读而不产出，这样收效甚微。所以就在网上找了很多常见的技术问题，根据自己的技术积累，查阅书籍，阅读文档和博客等资料，尝试着用自己的话去写了很多原创解答，最终整理开源到Github。一方面是便于自己复习巩固，一方面是将这些自己写的解答开源出来分享给大家，希望可以帮助到大家，也欢迎大家一起来完善这个项目，为开源做贡献。\n\n\u003cfigure class=\"half\"\u003e\n\u003cimg src=\"http://notfound9.github.io/interviewGuide/static/image1.jpg\" width=\"30%\"/\u003e\n\n\n## 目录\n\n- [首页](README.md)\n* Java\n  - [基础](docs/JavaBasic.md)\n    - [1.Java中的多态是什么？](docs/JavaBasic.md#Java中的多态是什么？)\n    - [2.Java中变量，代码块，构造器之间执行顺序是怎么样的？](docs/JavaBasic.md#java中变量，代码块，构造器之间执行顺序是怎么样的？)\n    - [3.final关键字有哪些作用？](docs/JavaBasic.md#final关键字有哪些作用？)\n    - [4.Integer类会进行缓存吗？](docs/JavaBasic.md#Integer类会进行缓存吗？)\n    - [5.抽象类有哪些特点？](docs/JavaBasic.md#抽象类有哪些特点？)\n    - [6.String，StringBuffer和StringBuilder之间的区别是什么？](docs/JavaBasic.md#String，StringBuffer和StringBuilder之间的区别是什么？)\n    - [7.编译型编程语言，解释型编程语言，伪编译型语言的区别是什么？](docs/JavaBasic.md#编译型编程语言，解释型编程语言，伪编译型语言的区别是什么？)\n    - [8.Java中的访问控制符有哪些？](docs/JavaBasic.md#Java中的访问控制符有哪些？)\n    - [9.Java的构造器有哪些特点？](docs/JavaBasic.md#Java的构造器有哪些特点？)\n    - [10.Java中的内部类是怎么样的？](docs/JavaBasic.md#Java中的内部类是怎么样的？)\n    - [11.Java中的注解是什么？](docs/JavaBasic.md#Java中的注解是什么?)\n    - [12.为什么hashCode()和equal()方法要一起重写？](docs/JavaBasic.md#为什么hashCode()和equal()方法要一起重写？)\n    -  [13.Java中有哪些数据类型？](docs/JavaBasic.md#Java中有哪些数据类型？)\n    - [14.包装类型和基本类型的区别是什么？](docs/JavaBasic.md#包装类型和基本类型的区别是什么？)\n  * 容器\n    - [ArrayList和LinkedList](docs/ArrayList.md)\n      - [1.ArrayList与LinkedList的区别是什么？](docs/ArrayList.md#ArrayList与LinkedList的区别是什么？)\n      - [2.怎么使ArrayList，LinkedList变成线程安全的呢？](docs/ArrayList.md#怎么使ArrayList，LinkedList变成线程安全的呢？)\n      - [3.ArrayList遍历时删除元素有哪些方法？](docs/ArrayList.md#ArrayList遍历时删除元素有哪些方法？)\n      - [4.ConcurrentModificationException是什么？](docs/ArrayList.md#ConcurrentModificationException是什么？)\n      - [5.java容器类的层次是怎么样的？](docs/ArrayList.md#java容器类的层次是怎么样的？)\n    - [HashMap和ConcurrentHashMap](docs/HashMap.md)\n      - [1.HashMap添加一个键值对的过程是怎么样的？](docs/HashMap.md#HashMap添加一个键值对的过程是怎么样的？)\n      - [2.ConcurrentHashMap添加一个键值对的过程是怎么样的？](docs/HashMap.md#ConcurrentHashMap添加一个键值对的过程是怎么样的？)\n      - [3.HashMap与HashTable，ConcurrentHashMap的区别是什么？](docs/HashMap.md#HashMap与HashTable，ConcurrentHashMap的区别是什么？)\n      - [4.HashMap扩容后是否需要rehash？](docs/HashMap.md#HashMap扩容后是否需要rehash？)\n      - [5.HashMap扩容是怎样扩容的，为什么都是2的N次幂的大小？](docs/HashMap.md#HashMap扩容是怎样扩容的，为什么都是2的N次幂的大小？)\n      - [6.ConcurrentHashMap是怎么记录元素个数size的？](docs/HashMap.md#ConcurrentHashMap是怎么记录元素个数size的？)\n      - [7.为什么ConcurrentHashMap，HashTable不支持key，value为null？](docs/HashMap.md#为什么ConcurrentHashMap，HashTable不支持key，value为null？)\n      - [8.HashSet和HashMap的区别？](docs/HashMap.md#HashSet和HashMap的区别？)\n      - [9.HashMap遍历时删除元素的有哪些实现方法？](docs/HashMap.md#HashMap遍历时删除元素的有哪些实现方法？)\n  - [多线程](docs/JavaMultiThread.md)\n    - [1.进程与线程的区别是什么？](docs/JavaMultiThread.md#进程与线程的区别是什么？)\n    - [2.进程间如何通信？](docs/JavaMultiThread.md#进程间如何通信？)\n    - [3.Java中单例有哪些写法？](docs/JavaMultiThread.md#Java中单例有哪些写法？)\n    - [4.Java中创建线程有哪些方式?](docs/JavaMultiThread.md#Java中创建线程有哪些方式?)\n    - [5.如何解决序列化时可以创建出单例对象的问题?](docs/JavaMultiThread.md#如何解决序列化时可以创建出单例对象的问题?)\n    - [6.volatile关键字有什么用？怎么理解可见性，一般什么场景去用可见性？](docs/JavaMultiThread.md#volatile关键字有什么用？怎么理解可见性，一般什么场景去用可见性？)\n    - [7.Java中线程的状态是怎么样的？](docs/JavaMultiThread.md#Java中线程的状态是怎么样的？)\n    - [8.wait()，join()，sleep()方法有什么作用？](docs/JavaMultiThread.md#wait()，join()，sleep()方法有什么作用？)\n    - [9.Thread.sleep(),Object.wait(),LockSupport.park()有什么区别？](docs/JavaMultiThread.md#Thread.sleep(),Object.wait(),LockSupport.park()有什么区别？)\n    - [10.谈一谈你对线程中断的理解？](docs/JavaMultiThread.md#谈一谈你对线程中断的理解？)\n    - [11.线程间怎么通信？](docs/JavaMultiThread.md#线程间怎么通信？)\n    - [12.怎么实现实现一个生产者消费者？](docs/JavaMultiThread.md#怎么实现实现一个生产者消费者？)\n    - [13.谈一谈你对线程池的理解？](docs/JavaMultiThread.md#谈一谈你对线程池的理解？)\n    - [14.线程池有哪些状态？](docs/JavaMultiThread.md#线程池有哪些状态？)\n  - [锁相关](docs/Lock.md)\n    - [1.sychronize的实现原理是怎么样的？](docs/Lock.md#sychronize的实现原理是怎么样的？)\n    - [2.AbstractQueuedSynchronizer(缩写为AQS)是什么？](docs/Lock.md#AbstractQueuedSynchronizer(缩写为AQS)是什么？)\n    - [3.悲观锁和乐观锁是什么？](docs/Lock.md#悲观锁和乐观锁是什么？)\n* Redis\n  - [基础](docs/RedisBasic.md)\n    - [1.Redis是什么？](docs/RedisBasic.md#Redis是什么？)\n    - [2.Redis过期key是怎么样清理的？](docs/RedisBasic.md#Redis过期key是怎么样清理的？)\n    - [3.Redis为什么是单线程的？](docs/RedisBasic.md#Redis为什么是单线程的？)\n    - [4.Redis的性能为什么这么高？](docs/RedisBasic.md#Redis的性能为什么这么高？)\n    - [5.Linux中IO模型一共有哪些？](docs/RedisBasic.md#Linux中IO模型一共有哪些？)\n    - [6.同步与异步的区别是什么？](docs/RedisBasic.md#同步与异步的区别是什么？)\n    - [7.阻塞与非阻塞的区别是什么？](docs/RedisBasic.md#阻塞与非阻塞的区别是什么？)\n    - [8.如何解决Redis缓存穿透问题？](docs/RedisBasic.md#如何解决Redis缓存穿透问题？)\n    - [9.如何解决Redis缓存击穿问题？](docs/RedisBasic.md#如何解决Redis缓存击穿问题？)\n    - [10.如何解决Redis缓存雪崩问题？](docs/RedisBasic.md#如何解决Redis缓存雪崩问题？)\n    - [11.如何解决缓存与数据库的数据一致性问题？](docs/RedisBasic.md#如何解决缓存与数据库的数据一致性问题？)\n  - [数据结构](docs/RedisDataStruct.md)\n    - [1.Redis常见的数据结构有哪些？](docs/RedisDataStruct.md#Redis常见的数据结构有哪些？)\n    - [2.谈一谈你对Redis中简单动态字符串的理解？](docs/RedisDataStruct.md#谈一谈你对Redis中简单动态字符串的理解？)\n    - [3.谈一谈你对Redis中hash对象的理解？](docs/RedisDataStruct.md#谈一谈你对Redis中hash对象的理解？)\n    - [4.谈一谈你对Redis中List的理解？](docs/RedisDataStruct.md#谈一谈你对Redis中List的理解？)\n    - [5.谈一谈你对Redis中Set的理解？](docs/RedisDataStruct.md#谈一谈你对Redis中Set的理解？)\n    - [6.谈一谈你对Redis中有序集合ZSet的理解？](docs/RedisDataStruct.md#谈一谈你对Redis中有序集合ZSet的理解？)\n    - [7.布隆过滤器是什么？](docs/RedisDataStruct.md#布隆过滤器是什么？)\n  - [持久化(AOF和RDB)](docs/RedisStore.md)\n    - [1.Redis的持久化是怎么实现的？](docs/RedisStore.md#Redis的持久化是怎么实现的？)\n    - [2.AOF和RDB的区别是什么？](docs/RedisStore.md#AOF和RDB的区别是什么？)\n    - [3.怎么防止AOF文件越来越大？](docs/RedisStore.md#怎么防止AOF文件越来越大？)\n    - [4.Redis持久化策略该如何进行选择？](docs/RedisStore.md#Redis持久化策略该如何进行选择？)\n  - [高可用(主从切换和哨兵机制)](docs/RedisUserful.md)\n    - [1.Redis主从同步是怎么实现的？](docs/RedisUserful.md#Redis主从同步是怎么实现的？)\n    - [2.Redis中哨兵是什么？](docs/RedisUserful.md#Redis中哨兵是什么？)\n    - [3.客户端是怎么接入哨兵系统的？](docs/RedisUserful.md#客户端是怎么接入哨兵系统的？)\n    - [4.Redis哨兵系统是怎么实现自动故障转移的？](docs/RedisUserful.md#Redis哨兵系统是怎么实现自动故障转移的？)\n    - [5.谈一谈你对Redis Cluster的理解？](docs/RedisUserful.md#谈一谈你对RedisCluster的理解？)\n    - [6.RedisCluster是怎么实现数据分片的？](docs/RedisUserful.md#RedisCluster是怎么实现数据分片的？)\n    - [7.RedisCluster是怎么做故障转移和发现的？](docs/RedisUserful.md#RedisCluster是怎么做故障转移和发现的？)\n* MySQL\n  - [基础](docs/MySQLNote.md)\n    - [1.一条MySQL更新语句的执行过程是什么样的？](docs/MySQLNote.md#一条MySQL更新语句的执行过程是什么样的？)\n    - [2.脏页是什么？](docs/MySQLNote.md#脏页是什么？)\n    - [3.Checkpoint是什么？](docs/MySQLNote.md#Checkpoint是什么？)\n    - [4.undo log，redo log，bin log是什么？](docs/MySQLNote.md#undolog，redolog，binlog是什么？)\n    - [5.MySQL中的事务是什么？](docs/MySQLNote.md#MySQL中的事务是什么？)\n    - [6.MySQL的隔离级别是怎么样的？](docs/MySQLNote.md#MySQL的隔离级别是怎么样的？)\n    - [7.MVCC的实现原理是怎么样的？](docs/MySQLNote.md#MVCC的实现原理是怎么样的？)\n    - [8.MySQL是怎么解决幻读的问题的？](docs/MySQLNote.md#MySQL是怎么解决幻读的问题的？)\n    - [9.MySQL中有哪些锁？](docs/MySQLNote.md#MySQL中有哪些锁？)\n    - [10.B树是什么？](docs/MySQLNote.md#B树是什么？)\n    - [11.B树与B+树的区别是什么？](docs/MySQLNote.md#B树与B+树的区别是什么？)\n    - [12.索引是什么？](docs/MySQLNote.md#索引是什么？)\n    - [13.字符串索引和数字类型索引的区别？](docs/MySQLNote.md#字符串索引和数字类型索引的区别？)\n    - [14.union和union all的区别是什么？](docs/MySQLNote.md#union和union)\n    - [15.Join的工作流程是怎么样的，怎么进行优化？](docs/MySQLNote.md#Join的工作流程是怎么样的，怎么进行优化)\n    - [16.聚集索引是什么？](docs/MySQLNote.md#聚集索引是什么？)\n    - [17.联合索引是什么？](docs/MySQLNote.md#联合索引是什么？)\n    - [18.覆盖索引是什么？](docs/MySQLNote.md#覆盖索引是什么？)\n    - [19.哪些情况不要建索引？](docs/MySQLNote.md#哪些情况不要建索引？)\n    - [20.主键，唯一性索引，普通索引的区别是什么？](docs/MySQLNote.md#主键，唯一性索引，普通索引的区别是什么？)\n    - [21.InnoDB和MyISAM的区别是什么？](docs/MySQLNote.md#InnoDB和MyISAM的区别是什么？)\n    - [22.什么是分库分表？](docs/MySQLNote.md#什么是分库分表？)\n    - [23.怎么实现跨库分页查询？](docs/MySQLNote.md#怎么实现跨库分页查询？)\n    - [24.MySQL主从复制的工作流程是什么样的？](docs/MySQLNote.md#MySQL主从复制的工作流程是什么样的？)\n    - [25.char类型与varchar类型的区别？](docs/MySQLNote.md#char类型与varchar类型的区别？)\n    - [26.查询数量SELECT Count(*)怎么优化？](docs/MySQLNote.md#怎么优化数量查询？)\n    - [27.如何优化MySQL慢查询？](docs/MySQLNote.md#如何优化MySQL慢查询？) \n    - [28.MySQL的join的实现是怎么样的？](docs/MySQLNote.md#MySQL的join的实现是怎么样的？)\n  - [慢查询优化实践](docs/MySQLWork.md) \n* JVM\n  - [基础](docs/JavaJVM.md)\n    - [1.Java内存区域怎么划分的？](docs/JavaJVM.md#Java内存区域怎么划分的？)\n    - [2.Java中对象的创建过程是怎么样的？](docs/JavaJVM.md#Java中对象的创建过程是怎么样的？)\n    - [3.Java对象的内存布局是怎么样的？](docs/JavaJVM.md#Java对象的内存布局是怎么样的？)\n    - [4.垃圾回收有哪些特点？](docs/JavaJVM.md#垃圾回收有哪些特点？)\n    - [5.在垃圾回收机制中，对象在内存中的状态有哪几种？](docs/JavaJVM.md#在垃圾回收机制中，对象在内存中的状态有哪几种？)\n    - [6.对象的强引用，软引用，弱引用和虚引用的区别是什么？](docs/JavaJVM.md#对象的强引用，软引用，弱引用和虚引用的区别是什么？)\n    - [7.双亲委派机制是什么？](docs/JavaJVM.md#双亲委派机制是什么？)\n    - [8.怎么自定义一个类加载器？](docs/JavaJVM.md#怎么自定义一个类加载器？)\n    - [9.垃圾回收算法有哪些？](docs/JavaJVM.md#垃圾回收算法有哪些？)\n    - [10.Minor GC和Full GC是什么？](docs/JavaJVM.md#MinorGC和FullGC是什么？)\n    - [11.如何确定一个对象可以回收？](docs/JavaJVM.md#如何确定一个对象是否可以被回收？)\n    - [12.目前通常使用的是什么垃圾收集器？](docs/JavaJVM.md#目前通常使用的是什么垃圾收集器？)\n- [Kafka](docs/Kafka.md)\n- [ZooKeeper](docs/ZooKeeper.md)\n- [HTTP](docs/HTTP.md)\n- [Spring](docs/Spring.md)\n- [Nginx](docs/Nginx.md)\n- [系统设计](docs/SystemDesign.md)\n* 算法\n    - [《剑指Offer》解题思考](docs/CodingInterviews.md)\n    - [《LeetCode热门100题》解题思考(上)](docs/LeetCode.md)\n    - [《LeetCode热门100题》解题思考(下)](docs/LeetCode1.md)\n- [大厂面试公众号文章系列](docs/BATInterview.md)\n  - [【大厂面试01期】高并发场景下，如何保证缓存与数据库一致性？](https://mp.weixin.qq.com/s/hwMpAVZ1_p8gLfPAzA8X9w)\n  - [【大厂面试02期】Redis过期key是怎么样清理的？](https://mp.weixin.qq.com/s/J_nOPKS17Uax2zGrZsE8ZA)\n  - [【大厂面试03期】MySQL是怎么解决幻读问题的？](https://mp.weixin.qq.com/s/8D6EmZM3m6RiSk0-N5YCww)\n  - [【大厂面试04期】讲讲一条MySQL更新语句是怎么执行的？](https://mp.weixin.qq.com/s/pNe1vdTT24oEoJS_zs-5jQ)\n  - [【大厂面试05期】说一说你对MySQL中锁的理解？](https://mp.weixin.qq.com/s/pTpPE33X-iYULYt8DOPp2w)\n  - [【大厂面试06期】谈一谈你对Redis持久化的理解？](https://mp.weixin.qq.com/s/nff4fd5TnM-CMWb1hQIT9Q)\n  - [【大厂面试07期】说一说你对synchronized锁的理解？](https://mp.weixin.qq.com/s/H8Cd2fj82qbdLZKBlo-6Dg)\n  - [【大厂面试08期】谈一谈你对HashMap的理解？](https://mp.weixin.qq.com/s/b4f5NIPl9uVLkRg_UpWSJQ)\n* 读书笔记\n  - [《Redis设计与实现》读书笔记 上](docs/RedisBook1.md)\n  - [《Redis设计与实现》读书笔记 下](docs/RedisBook2.md)\n  - [《MySQL必知必会》读书笔记](docs/MySQLBook1.md)\n  - [《深入理解Java虚拟机-第三版》读书笔记](docs/JVMBook.md)  \n- [好书推荐](docs/bookRecommend.md)\n\n## 如何为这个开源项目做贡献？\n\n如果你想一起参与这个项目，可以提Pull Request，可以扫上面的入群二维码进群，如果入群二维码失效了，也可以扫我的微信，我们一起聊聊！\n\n## 关于我\n\n我平时比较喜欢看书，写技术文章，也比较喜欢讨论技术。这是我的[掘金主页](https://juejin.im/user/5b370a42e51d4558ce5eb969)，希望大家可以关注一下，谢谢了！大家如果有事需要联系我，或者想进技术群，一起讨论技术，也可以扫描[主页中我的微信二维码](http://notfound9.github.io/interviewGuide/#/)加我，谢谢了！\n\n\u003cimg src=\"http://notfound9.github.io/interviewGuide/static/image1.jpg\" width=\"30%\"/\u003e\n\n## 关于转载\n\n如果你需要转载本仓库的一些文章到自己的博客的话，记得注明原文地址就可以了。\n\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnotfound9%2Finterviewguide","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fnotfound9%2Finterviewguide","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnotfound9%2Finterviewguide/lists"}