java面试高频点深入第一期

布满荆棘的人生 2022-10-16 14:22 228阅读 0赞

java面试高频深入系列文章，都是对网上好文的整理。

是我几个月来从近千篇的文章中筛选出来的，文章质量极高，强烈建议每天花上半小时到一个小时进行阅读。

java面试高频点深入一共会有五期，该文是第一期。

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本期的内容有：

**java-core**：HashMap、内存泄漏、String为什么不可变；

**多线程**：synchronized、线程池；

**jvm**：类加载、双亲委派、jdbc与Tomcat如何打破双亲委派；

**mysql**：索引结构选型、B树与B+树；

**设计模式**：单例模式、代理模式；

**框架部分**：Spring中的设计模式、自动装配原理、Spring事务原理、Transaction失效原理；

**分布式**：分布式锁、CAP与BASE理论；

**实操部分**：排查内存溢出、排查CPU升高、排查堆内外内存溢出；

**网络**：七层或四层协议、HTTPS及加密算法；

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## Java-core部分 ##

### 一个HashMap跟面试官扯了半个小时 ###

[https://mp.weixin.qq.com/s/oRx-8XXbgage9Hf97WrDQQ][https_mp.weixin.qq.com_s_oRx-8XXbgage9Hf97WrDQQ]

### HashMap 面试二十一问！ ###

[https://mp.weixin.qq.com/s/oWiaWsBCxwCMiwHnmA6iKA][https_mp.weixin.qq.com_s_oWiaWsBCxwCMiwHnmA6iKA]

### 为什么 HashMap 的加载因子是0.75 ###

[https://juejin.cn/post/6937536098348793886][https_juejin.cn_post_6937536098348793886]

### HashMap的31连环炮 ###

[https://mp.weixin.qq.com/s/7I-5RL0Py-g8mP7lJol3Yg][https_mp.weixin.qq.com_s_7I-5RL0Py-g8mP7lJol3Yg]

### Java 8系列之重新认识HashMap ###

[https://tech.meituan.com/2016/06/24/java-hashmap.html][https_tech.meituan.com_2016_06_24_java-hashmap.html]

### Java源码分析：HashMap 1.8 相对于1.7 到底更新了什么？ ###

[https://www.jianshu.com/p/8324a34577a0?utm\_source=oschina-app][https_www.jianshu.com_p_8324a34577a0_utm_source_oschina-app]

### Java Map 中那些巧妙的设计 ###

[https://www.toutiao.com/i6943799935875777028][https_www.toutiao.com_i6943799935875777028]

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### 聊聊7种内存泄露场景和13种解决方案 ###

[https://mp.weixin.qq.com/s/l97a577bYCza7YLKRWdQ\_w][https_mp.weixin.qq.com_s_l97a577bYCza7YLKRWdQ_w]

### Java中七个潜在的内存泄露风险，你知道几个？ ###

[https://mp.weixin.qq.com/s/N8Y5KUTZIGSGQpqT0pfp6A][https_mp.weixin.qq.com_s_N8Y5KUTZIGSGQpqT0pfp6A]

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### **说说String与StringTable** ###

[https://zhuanlan.zhihu.com/p/260939453][https_zhuanlan.zhihu.com_p_260939453]

### 为什么String被设计成不可变 ###

[https://mp.weixin.qq.com/s/ACyQs9tTW5959YkW5HP7Uw][https_mp.weixin.qq.com_s_ACyQs9tTW5959YkW5HP7Uw]

### JDK9对String字符串的新一轮优化，不可不知 ###

[https://mp.weixin.qq.com/s/p1Q5AZWETUtajqtY2GUMtA][https_mp.weixin.qq.com_s_p1Q5AZWETUtajqtY2GUMtA]

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## 多线程部分 ##

### 一个synchronized跟面试官扯了半个小时 ###

[https://mp.weixin.qq.com/s/ts2Pjz3VpWm50kY-Ru7iTA][https_mp.weixin.qq.com_s_ts2Pjz3VpWm50kY-Ru7iTA]

### 17 张图看穿 synchronized 关键字 ###

[https://mp.weixin.qq.com/s?\_\_biz=MzUxODAzNDg4NQ==&mid=2247487236&idx=2&sn=1475f0250734b8ec2ee7bda4905b3b05&scene=21\#wechat\_redirect][https_mp.weixin.qq.com_s_biz_MzUxODAzNDg4NQ_mid_2247487236_idx_2_sn_1475f0250734b8ec2ee7bda4905b3b05_scene_21_wechat_redirect]

### 说一说你对synchronized锁的理解？ ###

[https://juejin.cn/post/6844904191375179784][https_juejin.cn_post_6844904191375179784]

### 关于 Synchronized 的一个点，网上99%的文章都错了 ###

[https://mp.weixin.qq.com/s?\_\_biz=MzkxNTE3NjQ3MA==&mid=2247488192&idx=1&sn=85fa12be29fef85d41c571b2c853de5d&scene=21\#wechat\_redirect][https_mp.weixin.qq.com_s_biz_MzkxNTE3NjQ3MA_mid_2247488192_idx_1_sn_85fa12be29fef85d41c571b2c853de5d_scene_21_wechat_redirect]

### Synchronized 升级到重量级锁之后就下不来了？你错了！ ###

[https://mp.weixin.qq.com/s/SUzNj4MsRJJzkhiquuLy0Q][https_mp.weixin.qq.com_s_SUzNj4MsRJJzkhiquuLy0Q]

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### 刨根问底 Java 并发之 CAS ###

[https://mp.weixin.qq.com/s/-TxpWTMBCGg00\_YMju6Jjg][https_mp.weixin.qq.com_s_-TxpWTMBCGg00_YMju6Jjg]

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### 线程池核心点和常问的面试点一网打尽 ###

[https://mp.weixin.qq.com/s/HWoyHgZiUz7pqFhYxfLDNA][https_mp.weixin.qq.com_s_HWoyHgZiUz7pqFhYxfLDNA]

### 面试被问线程池，真香 ###

[https://mp.weixin.qq.com/s/xtVKp9fUoIs8d94-5P2pEA][https_mp.weixin.qq.com_s_xtVKp9fUoIs8d94-5P2pEA]

### **1000 多个并发线程，10 台机器，每台机器 4 核，设计线程池大小** ###

[https://mp.weixin.qq.com/s/KHSi0M4sIN-rBbpAKfnBNw][https_mp.weixin.qq.com_s_KHSi0M4sIN-rBbpAKfnBNw]

### Java线程池实现原理及其在美团业务中的实践 ###

[https://tech.meituan.com/2020/04/02/java-pooling-pratice-in-meituan.html][https_tech.meituan.com_2020_04_02_java-pooling-pratice-in-meituan.html]

### 如何设置线程池参数？美团给出了一个让面试官虎躯一震的回答 ###

[https://mp.weixin.qq.com/s/EhBt44Rj0c5E-UVf742aGw][https_mp.weixin.qq.com_s_EhBt44Rj0c5E-UVf742aGw]

### ThreadPoolExecutor 线程池异常消失之刨根问底 ###

[https://juejin.cn/post/6925258524096200718][https_juejin.cn_post_6925258524096200718]

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## JVM部分 ##

### 这一篇文章，可以把Java中的类加载器了解的七七八八了 ###

[https://mp.weixin.qq.com/s/\_apuwN4OkaJoHIXFIUtRtw][https_mp.weixin.qq.com_s_apuwN4OkaJoHIXFIUtRtw]

### 别翻了，这篇文章绝对让你深刻理解java类的加载以及ClassLoader源码分析 ###

[https://blog.csdn.net/qq\_44543508/article/details/102983363][https_blog.csdn.net_qq_44543508_article_details_102983363]

### 读者美团五面：Java历史上有三次破坏双亲委派模型，是哪三次？ ###

[https://mp.weixin.qq.com/s/zZmsi7lpuQHECOHA2ohOvA][https_mp.weixin.qq.com_s_zZmsi7lpuQHECOHA2ohOvA]

### 如何打破双亲委派  ###

[https://blog.csdn.net/cy973071263/article/details/104129163][https_blog.csdn.net_cy973071263_article_details_104129163]

### 深入理解Tomcat 类加载器之为何违背双亲委派模型  ###

[https://mp.weixin.qq.com/s/6u2qhXgKelhrMAXVT2LGhA][https_mp.weixin.qq.com_s_6u2qhXgKelhrMAXVT2LGhA]

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## Mysql部分 ##

### 阿里一面，给了几条SQL，问需要执行几次树搜索操作？ ###

[https://mp.weixin.qq.com/s/TwDu2dS8EP31IVyv\_Qc5Hw][https_mp.weixin.qq.com_s_TwDu2dS8EP31IVyv_Qc5Hw]

### **索引底层的实现，为什么不选红黑树、B树等？** ###

[https://zhuanlan.zhihu.com/p/113917726][https_zhuanlan.zhihu.com_p_113917726]

### InnoDB中一棵B+树可以存放多少行数据？ ###

[https://mp.weixin.qq.com/s/yANBwsXnoVFd2silrMCeCQ][https_mp.weixin.qq.com_s_yANBwsXnoVFd2silrMCeCQ]

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### 我通过六个 MySQL 死锁案例，终于理解了死锁的原因 ###

[https://mp.weixin.qq.com/s/ffnmD03TCqIFxkVsCs\_6\_w][https_mp.weixin.qq.com_s_ffnmD03TCqIFxkVsCs_6_w]

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## 设计模式部分 ##

### 一个单例还能写出花来吗？ ###

[https://mp.weixin.qq.com/s/BkeJPTH4QH0w8hNP8yUefw][https_mp.weixin.qq.com_s_BkeJPTH4QH0w8hNP8yUefw]

### 单例模式的7个问题 ###

[https://mp.weixin.qq.com/s/BH4S7fcUTulsor4RTG5fZA][https_mp.weixin.qq.com_s_BH4S7fcUTulsor4RTG5fZA]

### 面试官问你单例设计模式，问问自己你真的了解单例吗？小单例，不简单！ ###

[https://juejin.cn/post/6844904169422192647][https_juejin.cn_post_6844904169422192647]

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### 漫画:AOP 面试造火箭事件始末  ###

[https://mp.weixin.qq.com/s/t0lLYjZ9FFWoedZhAp2-eg][https_mp.weixin.qq.com_s_t0lLYjZ9FFWoedZhAp2-eg]

### 动态代理总结，面试你要知道的都在这里，无废话！ ###

[https://mp.weixin.qq.com/s/KTkIa8VV08HlyQ8JaXSywQ][https_mp.weixin.qq.com_s_KTkIa8VV08HlyQ8JaXSywQ]

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## 框架部分 ##

### 来自读者的面试题：谈谈Spring用到了哪些设计模式？ ###

[https://mp.weixin.qq.com/s/sLCACtVxtLSL2gelxlFUZg][https_mp.weixin.qq.com_s_sLCACtVxtLSL2gelxlFUZg]

### 谈谈Spring中都用到了那些设计模式? ###

[https://mp.weixin.qq.com/s?\_\_biz=Mzg2OTA0Njk0OA==&mid=2247485303&idx=1&sn=9e4626a1e3f001f9b0d84a6fa0cff04a&chksm=cea248bcf9d5c1aaf48b67cc52bac74eb29d6037848d6cf213b0e5466f2d1fda970db700ba41&token=1667678311&lang=zh\_CN&scene=21\#wechat\_redirect][https_mp.weixin.qq.com_s_biz_Mzg2OTA0Njk0OA_mid_2247485303_idx_1_sn_9e4626a1e3f001f9b0d84a6fa0cff04a_chksm_cea248bcf9d5c1aaf48b67cc52bac74eb29d6037848d6cf213b0e5466f2d1fda970db700ba41_token_1667678311_lang_zh_CN_scene_21_wechat_redirect]

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### 认认真真梳理一遍自动装配原理！ ###

[https://mp.weixin.qq.com/s/ZxY\_AiJ1m3z1kH6juh2XHw][https_mp.weixin.qq.com_s_ZxY_AiJ1m3z1kH6juh2XHw]

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### 深入理解 Spring 事务原理 ###

[https://mp.weixin.qq.com/s/I2w9VMaJf7bOKnfVVgiWbA][https_mp.weixin.qq.com_s_I2w9VMaJf7bOKnfVVgiWbA]

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### 揭密 3种@Transactional 失效的场景和解决办法 ###

[https://mp.weixin.qq.com/s/X-KChRWVuv2MJlBVFWQt6A][https_mp.weixin.qq.com_s_X-KChRWVuv2MJlBVFWQt6A]

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## 分布式部分 ##

### Redis 分布式锁｜从青铜到钻石的五种演进方案 ###

[https://mp.weixin.qq.com/s/JpAqxQrQA7jRisNqiGoxBA][https_mp.weixin.qq.com_s_JpAqxQrQA7jRisNqiGoxBA]

### 分布式锁中的王者方案 - Redisson ###

[https://mp.weixin.qq.com/s/CbnPRfvq4m1sqo2uKI6qQw][https_mp.weixin.qq.com_s_CbnPRfvq4m1sqo2uKI6qQw]

### 七种方案！探讨Redis分布式锁的正确使用姿势 ###

[https://mp.weixin.qq.com/s/dHw\_7HALEaNMQso0wEXEEw][https_mp.weixin.qq.com_s_dHw_7HALEaNMQso0wEXEEw]

### Redis锁从面试连环炮聊到神仙打架 ###

[https://mp.weixin.qq.com/s/WXnAzYbVZ7GAT6AnOeFSgA][https_mp.weixin.qq.com_s_WXnAzYbVZ7GAT6AnOeFSgA]

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### 分布式事务: CAP原则及Base理论  ###

[https://mp.weixin.qq.com/s/0wsj6PE1Gs5Fun6pYGjdAw][https_mp.weixin.qq.com_s_0wsj6PE1Gs5Fun6pYGjdAw]

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## 实操部分 ##

### 内存溢出+CPU占用过高:问题排查+解决方案+复盘  ###

[https://zhanghan.blog.csdn.net/article/details/109255980][https_zhanghan.blog.csdn.net_article_details_109255980]

### 线上故障如何快速排查？来看这套技巧大全 ###

[https://mp.weixin.qq.com/s/PWNnq07cPYB4o421VFEFHw][https_mp.weixin.qq.com_s_PWNnq07cPYB4o421VFEFHw]

### 一次完整的JVM堆外内存泄漏故障排查记录 ###

[https://mp.weixin.qq.com/s/dMQatmbM0w1xGPOnhbfh8A][https_mp.weixin.qq.com_s_dMQatmbM0w1xGPOnhbfh8A]

### 百分百面试题:遇到过线上问题没有？ ###

[https://mp.weixin.qq.com/s/H4tqZ1a7YZLymMm30Jwanw][https_mp.weixin.qq.com_s_H4tqZ1a7YZLymMm30Jwanw]

### 怎么排查堆内存溢出啊？ ###

[https://mp.weixin.qq.com/s/7XGD-Z3wrThv5HyoK3B8AQ][https_mp.weixin.qq.com_s_7XGD-Z3wrThv5HyoK3B8AQ]

### 关于内存安全问题，你应该了解的几点！ ###

[https://mp.weixin.qq.com/s/BJUgnDPP2wtUUEjPnCX0oA][https_mp.weixin.qq.com_s_BJUgnDPP2wtUUEjPnCX0oA]

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## 网络部分 ##

### OSI七层或TCP/IP五层(四层)协议  ###

[https://mp.weixin.qq.com/s/lNyxDhOp4VtWJQiBa1\_c\_Q][https_mp.weixin.qq.com_s_lNyxDhOp4VtWJQiBa1_c_Q]

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### HTTPS 原理分析——带着疑问层层深入 ###

[https://blog.leapmie.com/archives/418/][https_blog.leapmie.com_archives_418]

## 全网最透彻HTTPS ##

[https://mp.weixin.qq.com/s/21JaXwdfSjItj5SgOwhapg][https_mp.weixin.qq.com_s_21JaXwdfSjItj5SgOwhapg]

### 几幅图，拿下 HTTPS ###

[https://mp.weixin.qq.com/s?\_\_biz=MzUxODAzNDg4NQ==&mid=2247487650&idx=1&sn=dfee83f6773a589c775ccd6f40491289&chksm=f98e5408cef9dd1ed900a15c27f00c811a5587ffa59a90a69a73d1794800838b6fd4b061ff9f&scene=21\#wechat\_redirect][https_mp.weixin.qq.com_s_biz_MzUxODAzNDg4NQ_mid_2247487650_idx_1_sn_dfee83f6773a589c775ccd6f40491289_chksm_f98e5408cef9dd1ed900a15c27f00c811a5587ffa59a90a69a73d1794800838b6fd4b061ff9f_scene_21_wechat_redirect]

### HTTPS之加密算法 ###

[https://mp.weixin.qq.com/s/hQXG8RL1opi1hCVJMXtKKw][https_mp.weixin.qq.com_s_hQXG8RL1opi1hCVJMXtKKw]

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[https_mp.weixin.qq.com_s_oRx-8XXbgage9Hf97WrDQQ]: https://mp.weixin.qq.com/s/oRx-8XXbgage9Hf97WrDQQ
[https_mp.weixin.qq.com_s_oWiaWsBCxwCMiwHnmA6iKA]: https://mp.weixin.qq.com/s/oWiaWsBCxwCMiwHnmA6iKA
[https_juejin.cn_post_6937536098348793886]: https://juejin.cn/post/6937536098348793886
[https_mp.weixin.qq.com_s_7I-5RL0Py-g8mP7lJol3Yg]: https://mp.weixin.qq.com/s/7I-5RL0Py-g8mP7lJol3Yg
[https_tech.meituan.com_2016_06_24_java-hashmap.html]: https://tech.meituan.com/2016/06/24/java-hashmap.html
[https_www.jianshu.com_p_8324a34577a0_utm_source_oschina-app]: https://www.jianshu.com/p/8324a34577a0?utm_source=oschina-app
[https_www.toutiao.com_i6943799935875777028]: https://www.toutiao.com/i6943799935875777028
[https_mp.weixin.qq.com_s_l97a577bYCza7YLKRWdQ_w]: https://mp.weixin.qq.com/s/l97a577bYCza7YLKRWdQ_w
[https_mp.weixin.qq.com_s_N8Y5KUTZIGSGQpqT0pfp6A]: https://mp.weixin.qq.com/s/N8Y5KUTZIGSGQpqT0pfp6A
[https_zhuanlan.zhihu.com_p_260939453]: https://zhuanlan.zhihu.com/p/260939453
[https_mp.weixin.qq.com_s_ACyQs9tTW5959YkW5HP7Uw]: https://mp.weixin.qq.com/s/ACyQs9tTW5959YkW5HP7Uw
[https_mp.weixin.qq.com_s_p1Q5AZWETUtajqtY2GUMtA]: https://mp.weixin.qq.com/s/p1Q5AZWETUtajqtY2GUMtA
[https_mp.weixin.qq.com_s_ts2Pjz3VpWm50kY-Ru7iTA]: https://mp.weixin.qq.com/s/ts2Pjz3VpWm50kY-Ru7iTA
[https_mp.weixin.qq.com_s_biz_MzUxODAzNDg4NQ_mid_2247487236_idx_2_sn_1475f0250734b8ec2ee7bda4905b3b05_scene_21_wechat_redirect]: https://mp.weixin.qq.com/s?__biz=MzUxODAzNDg4NQ==&mid=2247487236&idx=2&sn=1475f0250734b8ec2ee7bda4905b3b05&scene=21#wechat_redirect
[https_juejin.cn_post_6844904191375179784]: https://juejin.cn/post/6844904191375179784
[https_mp.weixin.qq.com_s_biz_MzkxNTE3NjQ3MA_mid_2247488192_idx_1_sn_85fa12be29fef85d41c571b2c853de5d_scene_21_wechat_redirect]: https://mp.weixin.qq.com/s?__biz=MzkxNTE3NjQ3MA==&mid=2247488192&idx=1&sn=85fa12be29fef85d41c571b2c853de5d&scene=21#wechat_redirect
[https_mp.weixin.qq.com_s_SUzNj4MsRJJzkhiquuLy0Q]: https://mp.weixin.qq.com/s/SUzNj4MsRJJzkhiquuLy0Q
[https_mp.weixin.qq.com_s_-TxpWTMBCGg00_YMju6Jjg]: https://mp.weixin.qq.com/s/-TxpWTMBCGg00_YMju6Jjg
[https_mp.weixin.qq.com_s_HWoyHgZiUz7pqFhYxfLDNA]: https://mp.weixin.qq.com/s/HWoyHgZiUz7pqFhYxfLDNA
[https_mp.weixin.qq.com_s_xtVKp9fUoIs8d94-5P2pEA]: https://mp.weixin.qq.com/s/xtVKp9fUoIs8d94-5P2pEA
[https_mp.weixin.qq.com_s_KHSi0M4sIN-rBbpAKfnBNw]: https://mp.weixin.qq.com/s/KHSi0M4sIN-rBbpAKfnBNw
[https_tech.meituan.com_2020_04_02_java-pooling-pratice-in-meituan.html]: https://tech.meituan.com/2020/04/02/java-pooling-pratice-in-meituan.html
[https_mp.weixin.qq.com_s_EhBt44Rj0c5E-UVf742aGw]: https://mp.weixin.qq.com/s/EhBt44Rj0c5E-UVf742aGw
[https_juejin.cn_post_6925258524096200718]: https://juejin.cn/post/6925258524096200718
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