JVM面试题及答案整理（最新版）

港控/mmm° 2022-09-03 02:25 306阅读 0赞

**Jvm面试题及答案整理965道（2021最新版）**

这是我收集的《Jvm 最常见的 965道面试题》高级Java面试问题列表。这些问题主要来自 JVM核心部分 ,你可能知道这些棘手的JVM 问题的答案，或者觉得这些不足以挑战你的 Java 知识，但这些问题都是容易在各种 JVM 面试中被问到的，而且包括我的朋友和同事在内的许多程序员都觉得很难回答。

## Jvm最新2021年面试题及答案，汇总版 ##

**01、** [JAVA弱引用][JAVA]  
**02、** [什么是堆][Link 1]  
**03、** [什么是程序计数器][Link 2]  
**04、** [各种回收器，各自优缺点，重点CMS、G1][CMS_G1]  
**05、** [可以描述一下 class 文件的结构吗？][class]  
**06、** [类的实例化顺序][Link 3]  
**07、** [怎么打出线程栈信息？][Link 4]  
**08、** [程序计数器是什么？][Link 5]  
**09、** [JVM的引用类型有哪些？][JVM]  
**10、** [Serial 与 Parallel GC 之间的不同之处？][Serial _ Parallel GC]

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## Jvm最新2021年面试题大汇总，附答案 ##

**01、** [GC Roots 有哪些？][GC Roots]  
**02、** [说说Java 垃圾回收机制][Java]  
**03、** [介绍一下类文件结构吧！][Link 6]  
**04、** [分代收集算法][Link 7]  
**05、** [堆溢出的原因？][Link 8]  
**06、** [Tomcat是怎么打破双亲委派机制的呢？][Tomcat]  
**07、** [你知道哪些垃圾收集器？][Link 9]  
**08、** [JVM 选项 -XX:+UseCompressedOops 有什么作用？为什么要使用][JVM _ -XX_UseCompressedOops]  
**09、** [invokedynamic 指令是干什么的？][invokedynamic]  
**10、** [动态改变构造][Link 10]

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## Jvm最新2021年面试题附答案解析，大汇总 ##

**01、** [ZGC 了解吗？][ZGC]  
**02、** [safepoint是什么？][safepoint]  
**03、** [JVM 提供的常用工具][JVM 1]  
**04、** [CMS 收集器（多线程标记清除算法）][CMS]  
**05、** [对象都是优先分配在年轻代上的吗？][Link 11]  
**06、** [有哪些 GC 算法？][GC]  
**07、** [有什么堆外内存的排查思路？][Link 12]  
**08、** [SWAP会影响性能么？][SWAP]  
**09、** [你知道哪些JVM性能调优][JVM 2]  
**10、** [你都有哪些手段用来排查内存溢出？][Link 13]

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## Jvm最新2021年面试题，高级面试题及附答案解析 ##

**01、** [类加载的过程是什么？][Link 14]  
**02、** [谈谈 JVM 中的常量池][JVM 3]  
**03、** [JVM 内存区域][JVM 4]  
**04、** [G1 收集器][G1]  
**05、** [堆的作用是什么？][Link 15]  
**06、** [如何查看 JVM 当前使用的是什么垃圾收集器？][JVM 5]  
**07、** [GC的回收流程是怎样的？][GC 1]  
**08、** [类的实例化顺序][Link 16]  
**09、** [工作中常用的 JVM 配置参数有哪些？][JVM 6]  
**10、** [Java里有哪些引用类型？][Java 1]

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## Jvm最新面试题2021年，常见面试题及答案汇总 ##

**01、** [谈谈动态年龄判断][Link 17]  
**02、** [类初始化的情况有哪些？][Link 18]  
**03、** [GC 是什么？为什么要有 GC？][GC _ GC]  
**04、** [MinorGC，MajorGC、FullGC都什么时候发生？][MinorGC_MajorGC_FullGC]  
**05、** [Java的双亲委托机制是什么？][Java 2]  
**06、** [在 Java 中，对象什么时候可以被垃圾回收？][Java 3]  
**07、** [有哪些打破了双亲委托机制的案例？][Link 19]  
**08、** [JVM 年轻代到年老代的晋升过程的判断条件是什么呢？][JVM 7]  
**09、** [JVM 数据运行区，哪些会造成 OOM 的情况？][JVM _ OOM]  
**10、** [JVM 类加载机制][JVM 8]

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## Jvm最新面试题及答案整理，汇总版 ##

**01、** [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 20]  
**02、** [生产环境 CPU 占用过高，你如何解决？][CPU]  
**03、** [JVM 的内存模型是什么？][JVM 9]  
**04、** [你知道哪些GC类型？][GC 2]  
**05、** [如何判断一个常量是废弃常量 ？][Link 21]  
**06、** [对象的内存布局了解吗？][Link 22]  
**07、** [Java对象的布局了解过吗？][Java 4]  
**08、** [谈谈双亲委派模型][Link 23]  
**09、** [CMS分为哪几个阶段?][CMS 1]  
**10、** [解释 Java 堆空间及 GC？][Java _ GC]

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## Jvm最新面试题及答案附答案汇总 ##

**01、** [如何开启和查看 GC 日志？][GC 3]  
**02、** [Parallel Scavenge 收集器（多线程复制算法、高效）][Parallel Scavenge]  
**03、** [说下有哪些类加载器？][Link 24]  
**04、** [你做过 JVM 调优，说说如何查看 JVM 参数默认值？][JVM _ JVM]  
**05、** [什么是双亲委派机制？][Link 25]  
**06、** [内存溢出和内存泄漏的区别？][Link 26]  
**07、** [强引用、软引用、弱引用、虚引用是什么，有什么区别？][Link 27]  
**08、** [垃圾回收的优点和原理。说说2种回收机制][2]  
**09、** [说一下垃圾分代收集的过程][Link 28]  
**10、** [JVM 运行时内存][JVM 10]

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## Jvm最新面试题，2021年面试题及答案汇总 ##

**02、** [老年代与标记复制算法][Link 29]  
**03、** [分代回收][Link 30]  
**04、** [说一下堆和栈的区别][Link 31]  
**05、** [方法区/永久代（线程共享）][Link 32]  
**06、** [类加载器][Link 33]  
**07、** [谈谈永久代][Link 34]  
**08、** [ZGC收集器中的染色指针有什么用？][ZGC 1]  
**09、** [JVM垃圾回收时候如何确定垃圾？什么是GC Roots？][JVM_GC Roots]  
**10、** [什么是内存屏障？][Link 35]

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## Jvm最新面试题，常见面试题及答案汇总 ##

**01、** [类加载有几个过程？][Link 36]  
**02、** [简述Java的对象结构][Java 5]  
**03、** [怎么查看服务器默认的垃圾回收器是哪一个？][Link 37]  
**04、** [JAVA 强引用][JAVA 1]  
**05、** [详细介绍一下JVM内存模型][JVM 11]  
**06、** [32 位 JVM 和 64 位 JVM 的最大堆内存分别是多数？][32 _ JVM _ 64 _ JVM]  
**07、** [HashMap中的key，可以是普通对象么？需要什么注意的地方？][HashMap_key]  
**08、** [你熟悉哪些垃圾收集算法？][Link 38]  
**09、** [GC 垃圾收集器][GC 4]  
**10、** [什么情况发生栈溢出？][Link 39]

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[JAVA]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#1java%E5%BC%B1%E5%BC%95%E7%94%A8
[Link 1]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#2%E4%BB%80%E4%B9%88%E6%98%AF%E5%A0%86
[Link 2]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#3%E4%BB%80%E4%B9%88%E6%98%AF%E7%A8%8B%E5%BA%8F%E8%AE%A1%E6%95%B0%E5%99%A8
[CMS_G1]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#4%E5%90%84%E7%A7%8D%E5%9B%9E%E6%94%B6%E5%99%A8%E5%90%84%E8%87%AA%E4%BC%98%E7%BC%BA%E7%82%B9%E9%87%8D%E7%82%B9cmsg1
[class]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#5%E5%8F%AF%E4%BB%A5%E6%8F%8F%E8%BF%B0%E4%B8%80%E4%B8%8B-class-%E6%96%87%E4%BB%B6%E7%9A%84%E7%BB%93%E6%9E%84%E5%90%97
[Link 3]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#6%E7%B1%BB%E7%9A%84%E5%AE%9E%E4%BE%8B%E5%8C%96%E9%A1%BA%E5%BA%8F
[Link 4]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#7%E6%80%8E%E4%B9%88%E6%89%93%E5%87%BA%E7%BA%BF%E7%A8%8B%E6%A0%88%E4%BF%A1%E6%81%AF
[Link 5]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#8%E7%A8%8B%E5%BA%8F%E8%AE%A1%E6%95%B0%E5%99%A8%E6%98%AF%E4%BB%80%E4%B9%88
[JVM]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#9jvm%E7%9A%84%E5%BC%95%E7%94%A8%E7%B1%BB%E5%9E%8B%E6%9C%89%E5%93%AA%E4%BA%9B
[Serial _ Parallel GC]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md#10serial-%E4%B8%8E-parallel-gc-%E4%B9%8B%E9%97%B4%E7%9A%84%E4%B8%8D%E5%90%8C%E4%B9%8B%E5%A4%84
[10_30_...]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%EF%BC%8C%E6%B1%87%E6%80%BB%E7%89%88.md
[GC Roots]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%A4%A7%E6%B1%87%E6%80%BB%EF%BC%8C%E9%99%84%E7%AD%94%E6%A1%88.md#1gc-roots-%E6%9C%89%E5%93%AA%E4%BA%9B
[Java]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%A4%A7%E6%B1%87%E6%80%BB%EF%BC%8C%E9%99%84%E7%AD%94%E6%A1%88.md#2%E8%AF%B4%E8%AF%B4java-%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E6%9C%BA%E5%88%B6
[Link 6]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%A4%A7%E6%B1%87%E6%80%BB%EF%BC%8C%E9%99%84%E7%AD%94%E6%A1%88.md#3%E4%BB%8B%E7%BB%8D%E4%B8%80%E4%B8%8B%E7%B1%BB%E6%96%87%E4%BB%B6%E7%BB%93%E6%9E%84%E5%90%A7
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[Link 8]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%A4%A7%E6%B1%87%E6%80%BB%EF%BC%8C%E9%99%84%E7%AD%94%E6%A1%88.md#5%E5%A0%86%E6%BA%A2%E5%87%BA%E7%9A%84%E5%8E%9F%E5%9B%A0
[Tomcat]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%A4%A7%E6%B1%87%E6%80%BB%EF%BC%8C%E9%99%84%E7%AD%94%E6%A1%88.md#6tomcat%E6%98%AF%E6%80%8E%E4%B9%88%E6%89%93%E7%A0%B4%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE%E6%9C%BA%E5%88%B6%E7%9A%84%E5%91%A2
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[invokedynamic]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%A4%A7%E6%B1%87%E6%80%BB%EF%BC%8C%E9%99%84%E7%AD%94%E6%A1%88.md#9invokedynamic-%E6%8C%87%E4%BB%A4%E6%98%AF%E5%B9%B2%E4%BB%80%E4%B9%88%E7%9A%84
[Link 10]: https://gitee.com/souyunku/DevBooks/blob/master/docs/Jvm/Jvm%E6%9C%80%E6%96%B02021%E5%B9%B4%E9%9D%A2%E8%AF%95%E9%A2%98%E5%A4%A7%E6%B1%87%E6%80%BB%EF%BC%8C%E9%99%84%E7%AD%94%E6%A1%88.md#10%E5%8A%A8%E6%80%81%E6%94%B9%E5%8F%98%E6%9E%84%E9%80%A0
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