Jvm面试题及答案整理 271道,Jvm面试题大全带答案(2021最新版)

痛定思痛。 2022-09-05 04:04 296阅读 0赞

**Jvm面试题及答案整理 271道,Jvm面试题大全带答案(2021最新版)**

Jvm面试题及答案【最新版】Jvm高级面试题大全(2021版)，发现网上很多Jvm面试题及答案整理都没有答案，所以花了很长时间搜集，本套Jvm面试题大全，Jvm面试题大汇总，有大量经典的Jvm面试题以及答案，包含Jvm语言常见面试题、Jvm高级面试题及一些大厂Jvm开发面试宝典，面试经验技巧等，应届生，实习生，企业工作过的，都可参考学习!

## 这套Jvm面试题汇总大全，希望对大家有帮助哈~ ##

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博主已将面试题整理成了一个Jvm面试手册，是PDF版的

**1、** [Java的内存模型是什么？（JMM是什么？）][Java_JMM]  
**2、** [CMS分为哪几个阶段?][CMS]  
**3、** [GC Roots 有哪些？][GC Roots]  
**4、** [如何判断两个类是否相等？][Link 1]  
**5、** [JVM 类加载机制][JVM]  
**6、** [怎么看死锁的线程？][Link 2]  
**7、** [什么是分布式垃圾回收（DGC）？它是如何工作的？][DGC]  
**8、** [invokedynamic 指令是干什么的？][invokedynamic]  
**9、** [Java 的引用有哪些类型？][Java]  
**10、** [栈帧里面包含哪些东西？][Link 3]  
**11、** [Java 中会存在内存泄漏?简述一下][Java 1]  
**12、** [谈谈双亲委派模型][Java 1]  
**13、** [什么情况发生栈溢出？][Java 1]  
**14、** [JAVA8 与元数据][Java 1]  
**15、** [假如生产环境CPU占用过高，请谈谈你的分析思路和定位。][Java 1]  
**16、** [如何查看 JVM 当前使用的是什么垃圾收集器？][Java 1]  
**17、** [程序计数器为什么是私有的?][Java 1]  
**18、** [JVM 年轻代到年老代的晋升过程的判断条件是什么呢？][Java 1]  
**19、** [请解释StackOverflowError和OutOfMemeryError的区别？][Java 1]  
**20、** [可达性分析][Java 1]  
**21、** [什么是堆][Java 1]  
**22、** [Java 堆的结构是什么样子的？什么是堆中的永久代（Perm Gen space）][Java 1]  
**23、** [双亲委派模型是什么？][Java 1]  
**24、** [详细介绍一下JVM内存模型][Java 1]  
**25、** [什么情况下会发生栈溢出？][Java 1]  
**26、** [分区收集算法][Java 1]  
**27、** [JIT是什么？][Java 1]  
**28、** [直接内存是什么？][Java 1]  
**29、** [你熟悉哪些垃圾收集算法？][Java 1]  
**30、** [JVM 出现 fullGC 很频繁，怎么去线上排查问题][Java 1]  
**31、** [谈谈你知道的垃圾收集器][Java 1]  
**32、** [遇到过元空间溢出吗？][Link 4]  
**33、** [JVM中一次完整的GC流程是怎样的，对象如何晋升到老年代？][JVM_GC]  
**34、** [什么情况会造成元空间溢出？][Link 5]  
**35、** [垃圾收集算法][Link 6]  
**36、** [Java对象的布局了解过吗？][Java 2]  
**37、** [HashMap中的key，可以是普通对象么？需要什么注意的地方？][HashMap_key]  
**38、** [GC 是什么? 为什么要有 GC][GC _ _ GC]  
**39、** [有哪些类加载器？][Link 7]  
**40、** [stackoverflow错误，permgen space错误][stackoverflow_permgen space]  
**41、** [类初始化的情况有哪些？][Link 8]  
**42、** [方法区的作用是什么？][Link 9]  
**43、** [Java 中垃圾收集的方法有哪些][Link 9]  
**44、** [类加载器][Link 9]  
**45、** [32 位和 64 位的 JVM，int 类型变量的长度是多数？][Link 9]  
**46、** [如何找到死锁的线程？][Link 9]  
**47、** [什么是类加载器，类加载器有哪些？][Link 9]  
**48、** [你有哪些手段来排查 OOM 的问题？][Link 9]  
**49、** [类加载是什么？][Link 9]  
**50、** [类的实例化顺序][Link 9]  
**51、** [什么是逃逸分析？][Link 9]  
**52、** [Minor Gc和Full GC 有什么不同呢？][Link 9]  
**53、** [有什么堆外内存的排查思路？][Link 9]  
**54、** [生产环境 CPU 占用过高，你如何解决？][Link 9]  
**55、** [简单描述一下（分代）垃圾回收的过程][Link 9]  
**56、** [什么是 Class 文件？ Class 文件主要的信息结构有哪些？][Link 9]  
**57、** [怎样通过 Java 程序来判断 JVM 是 32 位 还是 64位？][Link 9]  
**58、** [如何开启和查看 GC 日志？][Link 9]  
**59、** [ZGC收集器中的染色指针有什么用？][Link 9]  
**60、** [堆（Heap-线程共享） -运行时数据区][Link 9]  
**61、** [JVM 数据运行区，哪些会造成 OOM 的情况？][JVM _ OOM]  
**62、** [谈谈你知道的垃圾回收算法][Link 10]  
**63、** [Java 内存分配与回收策率以及 Minor GC 和 Major GC][Java _ Minor GC _ Major GC]  
**64、** [JVM有哪些内存区域？(JVM的内存布局是什么？)][JVM_JVM]  
**65、** [被引用的对象就一定能存活吗？][Link 11]  
**66、** [JVM调优命令有哪些？][JVM 1]  
**67、** [说说类加载的过程][Link 12]  
**68、** [Java 程序是怎样运行的？][Java 3]  
**69、** [谈谈对 OOM 的认识][OOM]  
**70、** [Java 虚拟机栈的作用？][Java 4]  
**71、** [标记整理算法(Mark-Compact)][Mark-Compact]  
**72、** [谈谈JVM中，对类加载器的认识][Mark-Compact]  
**73、** [栈帧都有哪些数据？][Mark-Compact]  
**74、** [64 位 JVM 中，int 的长度是多数？][Mark-Compact]  
**75、** [程序计数器是什么？][Mark-Compact]  
**76、** [Tomcat是怎么打破双亲委派机制的呢？][Mark-Compact]  
**77、** [运行时栈帧包含哪些结构？][Mark-Compact]  
**78、** [GC日志的real、user、sys是什么意思？][Mark-Compact]  
**79、** [什么是程序计数器][Mark-Compact]  
**80、** [说说ZGC垃圾收集器的工作原理][Mark-Compact]  
**81、** [可以描述一下 class 文件的结构吗？][Mark-Compact]  
**82、** [你知道哪些JVM性能调优][Mark-Compact]  
**83、** [JVM内存模型][Mark-Compact]  
**84、** [在 Java 中，对象什么时候可以被垃圾回收？][Mark-Compact]  
**85、** [ParNew 垃圾收集器（Serial+多线程）][Mark-Compact]  
**86、** [各种回收器，各自优缺点，重点CMS、G1][Mark-Compact]  
**87、** [对象的访问方式有哪些？][Mark-Compact]  
**88、** [描述一下JVM加载class文件的原理机制？][Mark-Compact]  
**89、** [什么是方法区][Mark-Compact]  
**90、** [永久代][Mark-Compact]  
**91、** [新生代与复制算法][Link 13]  
**92、** [串行（serial）收集器和吞吐量（throughput）收集器的区别是什么？][serial_throughput]  
**93、** [怎么打出线程栈信息？][Link 14]  
**94、** [JVM怎么判断一个对象是不是要回收？][JVM 2]  
**95、** [JVM 监控与分析工具你用过哪些？介绍一下。][JVM 3]  
**96、** [复制算法（copying）][copying]  
**97、** [什么是指令重排序？][Link 15]  
**98、** [你了解过哪些垃圾收集器？][Link 16]  
**99、** [JVM 的内存模型是什么？][JVM 4]  
**100、** [谈谈动态年龄判断][Link 17]  
**101、** [JVM 有哪些运行时内存区域？][JVM 5]  
**102、** [工作中常用的 JVM 配置参数有哪些？][JVM 5]  
**103、** [Java会存在内存泄漏吗？请简单描述。][JVM 5]  
**104、** [GC 是什么？为什么要有 GC？][JVM 5]  
**105、** [你平时工作中用过的JVM常用基本配置参数有哪些？][JVM 5]  
**106、** [JRE、JDK、JVM 及 JIT 之间有什么不同？][JVM 5]  
**107、** [JVM的引用类型有哪些？][JVM 5]  
**108、** [Minor GC与Full GC分别在什么时候发生？][JVM 5]  
**109、** [说说G1垃圾收集器的工作原理][JVM 5]  
**110、** [堆的作用是什么？][JVM 5]  
**111、** [解释 Java 堆空间及 GC？][JVM 5]  
**112、** [说一下堆和栈的区别][JVM 5]  
**113、** [Serial 与 Parallel GC 之间的不同之处？][JVM 5]  
**114、** [什么是栈][JVM 5]  
**115、** [本地方法栈][JVM 5]  
**116、** [Parallel Old 收集器（多线程标记整理算法）][JVM 5]  
**117、** [方法区][JVM 5]  
**118、** [JVM 内存区域][JVM 5]  
**119、** [分代回收][JVM 5]  
**120、** [对象分配规则][JVM 5]  
**121、** [程序计数器有什么作用？][JVM 5]  
**122、** [你能保证 GC 执行吗？][GC]  
**123、** [动态改变构造][Link 18]  
**124、** [JRE、JDK、JVM 及 JIT 之间有什么不同？][JRE_JDK_JVM _ JIT]  
**125、** [说说类加载的过程][Link 19]  
**126、** [CMS 收集器（多线程标记清除算法）][CMS 1]  
**127、** [讲讲什么情况下会出现内存溢出，内存泄漏？][Link 20]  
**128、** [说下有哪些类加载器？][Link 21]  
**129、** [说一下垃圾分代收集的过程][Link 22]  
**130、** [描述一下什么情况下，对象会从年轻代进入老年代][Link 23]  
**131、** [类加载有几个过程？][Link 24]  
**132、** [safepoint是什么？][safepoint]  
**133、** [什么是方法内联？][safepoint]  
**134、** [有哪些打破了双亲委托机制的案例？][safepoint]  
**135、** [java中会存在内存泄漏吗，请简单描述。][safepoint]  
**136、** [有哪些 GC 算法？][safepoint]  
**137、** [如何判断一个类是无用的类?][safepoint]  
**138、** [怎么获取 Java 程序使用的内存？堆使用的百分比？][safepoint]  
**139、** [JVM 中一次完整的 GC 流程（从 ygc 到 fgc）是怎样的][safepoint]  
**140、** [32 位 JVM 和 64 位 JVM 的最大堆内存分别是多数？][safepoint]  
**141、** [Java 内存分配][safepoint]  
**142、** [GC 垃圾收集器][safepoint]  
**143、** [双亲委派][safepoint]  
**144、** [如何写一段简单的死锁代码？][safepoint]  
**145、** [什么时候会造成堆外内存溢出？][safepoint]  
**146、** [调优工具][safepoint]  
**147、** [什么是本地方法栈][safepoint]  
**148、** [JIT 是什么？][safepoint]  
**149、** [你做过 JVM 调优，说说如何查看 JVM 参数默认值？][safepoint]  
**150、** [JVM 的内存模型以及分区情况和作用][safepoint]  
**151、** [什么是happen-before原则？][safepoint]  
**152、** [如何判断对象是否是垃圾？][safepoint]  
**153、** [生产环境服务器变慢，如何诊断处理？][Link 25]  
**154、** [引用计数法][Link 26]  
**155、** [MinorGC，MajorGC、FullGC都什么时候发生？][MinorGC_MajorGC_FullGC]  
**156、** [调优命令有哪些？][Link 27]  
**157、** [JVM 选项 -XX:+UseCompressedOops 有什么作用？为什么要使用][JVM _ -XX_UseCompressedOops]  
**158、** [Parallel Scavenge 收集器（多线程复制算法、高效）][Parallel Scavenge]  
**159、** [老年代与标记复制算法][Link 28]  
**160、** [遇到过堆外内存溢出吗？][Link 29]  
**161、** [虚拟机栈(线程私有)][Link 30]  
**162、** [Java的双亲委托机制是什么？][Java 5]  
**163、** [CMS都有哪些问题？][CMS 2]  
**164、** [Java里有哪些引用类型？][CMS 2]  
**165、** [你知道哪些故障处理工具？][CMS 2]  
**166、** [运行时常量池的作用是什么?][CMS 2]  
**167、** [JVM的永久代中会发生垃圾回收么][CMS 2]  
**168、** [对象的内存布局了解吗？][CMS 2]  
**169、** [各种回收算法][CMS 2]  
**170、** [你说你做过JVM参数调优和参数配置，请问如何查看JVM系统默认值][CMS 2]  
**171、** [JAVA弱引用][CMS 2]  
**172、** [Java对象创建过程][CMS 2]  
**173、** [在新生代-复制算法][CMS 2]  
**174、** [生产环境用的什么JDK？如何配置的垃圾收集器？][CMS 2]  
**175、** [分代收集算法][CMS 2]  
**176、** [32、volatile关键字的原理是什么？干什么用的？][CMS 2]  
**177、** [说一下Java对象的创建过程][CMS 2]  
**178、** [什么情况下会发生栈内存溢出？][CMS 2]  
**179、** [强引用、软引用、弱引用、虚引用是什么，有什么区别？][CMS 2]  
**180、** [请你谈谈对OOM的认识][CMS 2]  
**181、** [怎么打破双亲委派模型？][CMS 2]  
**182、** [介绍一下 JVM 中垃圾收集器有哪些？ 他们特点分别是什么？][CMS 2]  
**183、** [标记清除算法（ Mark-Sweep）][Mark-Sweep]  
**184、** [Serial Old 收集器（单线程标记整理算法 ）][Serial Old _]  
**185、** [你都有哪些手段用来排查内存溢出？][Link 31]  
**186、** [类加载为什么要使用双亲委派模式，有没有什么场景是打破了这个模式？][Link 32]  
**187、** [描述一下 JVM 加载 class 文件的原理机制][JVM _ class]  
**188、** [能够找到 Reference Chain 的对象，就一定会存活么？][Reference Chain]  
**189、** [类加载器双亲委派模型机制？][Link 33]  
**190、** [字符串常量存放在哪个区域？][Link 34]  
**191、** [你知道哪些内存分配与回收策略？][Link 35]  
**192、** [Java 8 为什么要将永久代(PermGen)替换为元空间(MetaSpace)呢？][Java 8 _PermGen_MetaSpace]  
**193、** [谈谈永久代][Link 36]  
**194、** [简述Java的对象结构][Link 36]  
**195、** [SWAP会影响性能么？][Link 36]  
**196、** [列举一些你知道的打破双亲委派机制的例子。为什么要打破？][Link 36]  
**197、** [内存溢出和内存泄漏的区别？][Link 36]  
**198、** [对于JDK自带的监控和性能分析工具用过哪些？][Link 36]  
**199、** [Serial 垃圾收集器（单线程、 复制算法）][Link 36]  
**200、** [GC垃圾回收算法与垃圾收集器的关系？][Link 36]  
**201、** [方法区/永久代（线程共享）][Link 36]  
**202、** [safepoint 是什么？][Link 36]  
**203、** [什么是双亲委派机制？][Link 36]  
**204、** [垃圾回收的优点和原理。说说2种回收机制][Link 36]  
**205、** [程序计数器(线程私有)][Link 36]  
**206、** [为什么需要双亲委派模式？][Link 36]  
**207、** [介绍一下类文件结构吧！][Link 36]  
**208、** [哪些是 GC Roots？][Link 36]  
**209、** [MinorGC、MajorGC、FullGC 什么时候发生？][Link 36]  
**210、** [方法区溢出的原因？][Link 36]  
**211、** [如何判断对象可以被回收][Link 36]  
**212、** [Java 中堆和栈有什么区别？][Link 36]  
**213、** [本地方法栈的作用？][Link 36]  
**214、** [双亲委派机制可以被违背吗？请举例说明。][Link 37]  
**215、** [类的实例化顺序][Link 38]  
**216、** [栈溢出的原因？][Link 39]  
**217、** [如何判断一个常量是废弃常量 ？][Link 40]  
**218、** [你知道哪些垃圾收集器？][Link 41]  
**219、** [本地方法区(线程私有)][Link 42]  
**220、** [说说 JVM 如何执行 class 中的字节码。][JVM _ class 1]  
**221、** [分代收集算法][Link 43]  
**222、** [怎么查看服务器默认的垃圾回收器是哪一个？][Link 44]  
**223、** [OSGI（ 动态模型系统）][OSGI_]  
**224、** [对象是怎么从年轻代进入老年代的？][OSGI_]  
**225、** [对象分配内存的方式有哪些？][OSGI_]  
**226、** [对象在哪块内存分配？][OSGI_]  
**227、** [类加载的过程是什么？][OSGI_]  
**228、** [谈谈 JVM 中的常量池][OSGI_]  
**229、** [ZGC 了解吗？][OSGI_]  
**230、** [生产上如何配置垃圾收集器的？][OSGI_]  
**231、** [对象都是优先分配在年轻代上的吗？][OSGI_]  
**232、** [模块化编程与热插拔][OSGI_]  
**233、** [JVM 运行时内存][OSGI_]  
**234、** [运行时数据区是什么？][OSGI_]  
**235、** [JVM垃圾回收时候如何确定垃圾？什么是GC Roots？][OSGI_]  
**236、** [JAVA虚引用][OSGI_]  
**237、** [对象的访问定位有哪几种方式?][OSGI_]  
**238、** [线上常用的 JVM 参数有哪些？][OSGI_]  
**239、** [对象分配内存是否线程安全？][OSGI_]  
**240、** [JVM新生代中为什么要分为Eden和Survivor？][OSGI_]  
**241、** [说说Java 垃圾回收机制][OSGI_]  
**242、** [JAVA 强引用][OSGI_]  
**243、** [程序计数器][Link 45]  
**244、** [常用JVM基本配置参数][JVM 6]  
**245、** [创建对象的过程是什么？][Link 46]  
**246、** [说说你知道的几种主要的JVM参数][JVM 7]  
**247、** [说说CMS垃圾收集器的工作原理][CMS 3]  
**248、** [在老年代-标记整理算法][-]  
**249、** [垃圾回收器的基本原理是什么？垃圾回收器可以马上回收内存吗？有什么办法主动通知虚拟机进行垃圾回收？][Link 47]  
**250、** [什么是Java虚拟机？为什么Java被称作是“平台无关的编程语言”？][Java_Java]  
**251、** [你都用过G1垃圾回收器的哪几个重要参数？][G1]  
**252、** [什么是方法内联？][Link 48]  
**253、** [什么是内存屏障？][Link 49]  
**254、** [JVM 如何确定垃圾对象？][Link 49]  
**255、** [说一下堆内存中对象的分配的基本策略][Link 49]  
**256、** [Java 中 WeakReference 与 SoftReference 的区别？][Link 49]  
**257、** [JVM 提供的常用工具][Link 49]  
**258、** [说说线程栈][Link 49]  
**259、** [说一下 JVM 调优的工具？][Link 49]  
**260、** [运行时常量池溢出的原因？][Link 49]  
**261、** [你知道哪些GC类型？][Link 49]  
**262、** [invokedynamic指令是干什么的？][Link 49]  
**263、** [堆溢出的原因？][Link 49]  
**264、** [JVM垃圾回收机制，何时触发MinorGC等操作][Link 49]  
**265、** [G1 收集器][Link 49]  
**266、** [如何判断一个对象是否存活][Link 49]  
**267、** [强引用、软引用、弱引用、虚引用是什么？][Link 49]  
**268、** [JAVA软引用][Link 49]  
**269、** [堆和栈的区别][Link 49]  
**270、** [GC的回收流程是怎样的？][Link 49]  
**271、** [什么时候会触发FullGC][Link 49]

## 这套Jvm面试题汇总大全，希望对大家有帮助哈~ ##

## 其他面试题系列： ##

**[Java面试题及答案整理1078道-上篇（持续更新）][Java_1078_-]**

**[Java面试题及答案整理1078道-上篇（持续更新）][Java_1078_- 1]**

**[Elasticsearch面试题及答案整理128道（持续更新）][Elasticsearch_128]**

**[Dubbo面试题及答案整理182道（持续更新）][Dubbo_182]**

**[JavaScript面试题及答案整理 232道 (2021最新版)][JavaScript_ 232_ _2021]**

**[Android面试题及答案整理175道 (2021最新版)][Android_175_ _2021]**

**[HTML面试题及答案整理126道（持续更新）][HTML_126]**

[Java_1078_-]: https://zhuanlan.zhihu.com/p/400077285
[Java_1078_- 1]: https://zhuanlan.zhihu.com/p/400356106
[Elasticsearch_128]: https://zhuanlan.zhihu.com/p/400387347
[Dubbo_182]: https://zhuanlan.zhihu.com/p/400380308
[JavaScript_ 232_ _2021]: https://zhuanlan.zhihu.com/p/400413037
[Android_175_ _2021]: https://zhuanlan.zhihu.com/p/400405019
[HTML_126]: https://zhuanlan.zhihu.com/p/400403872
[Java_JMM]: https://gitee.com/souyunku/NewDevBooks/blob/master/docs/Jvm/Jvm%E4%B8%AD%E7%BA%A7%E9%9D%A2%E8%AF%95%E9%A2%98%E6%B1%87%E6%80%BB%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%882021%E5%B9%B4Jvm%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%E5%A4%A7%E5%85%A8%EF%BC%89.md#1java%E7%9A%84%E5%86%85%E5%AD%98%E6%A8%A1%E5%9E%8B%E6%98%AF%E4%BB%80%E4%B9%88jmm%E6%98%AF%E4%BB%80%E4%B9%88
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[Link 3]: https://gitee.com/souyunku/NewDevBooks/blob/master/docs/Jvm/Jvm%E4%B8%AD%E7%BA%A7%E9%9D%A2%E8%AF%95%E9%A2%98%E6%B1%87%E6%80%BB%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%882021%E5%B9%B4Jvm%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%E5%A4%A7%E5%85%A8%EF%BC%89.md#10%E6%A0%88%E5%B8%A7%E9%87%8C%E9%9D%A2%E5%8C%85%E5%90%AB%E5%93%AA%E4%BA%9B%E4%B8%9C%E8%A5%BF
[Java 1]: https://gitee.com/souyunku/NewDevBooks/blob/master/docs/Jvm/Jvm%E4%B8%AD%E7%BA%A7%E9%9D%A2%E8%AF%95%E9%A2%98%E6%B1%87%E6%80%BB%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%882021%E5%B9%B4Jvm%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%E5%A4%A7%E5%85%A8%EF%BC%89.md
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[Java 2]: https://gitee.com/souyunku/NewDevBooks/blob/master/docs/Jvm/Jvm%E4%B8%AD%E7%BA%A7%E9%9D%A2%E8%AF%95%E9%A2%98%E9%99%84%E7%AD%94%E6%A1%88%E6%B1%87%E6%80%BB%EF%BC%882021%E5%B9%B4Jvm%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%E5%A4%A7%E5%85%A8%EF%BC%89.md#5java%E5%AF%B9%E8%B1%A1%E7%9A%84%E5%B8%83%E5%B1%80%E4%BA%86%E8%A7%A3%E8%BF%87%E5%90%97
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