# JVM结构剖析

每个Java开发人员都知道字节码经由JRE（Java运行时环境）执行。但他们或许不知道JRE其实是由Java虚拟机（JVM）实现，JVM分析字节码，解释并执行它。

JVM中文逻辑结构图如下：

![](/files/-Ltdv9mMKFHuCHOn6hIh)

JVM官网结构图：

![](/files/-Ltdv9mOGvKXHn30j-HK)

## JVM是如何工作的？

如上面架构图所示，JVM分为三个主要子系统：

1. 类加载器子系统（Class Loader Subsystem）
2. 运行时数据区（Runtime Data Area）
3. 执行引擎（Execution Engine）


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