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* [点击阅读面试进阶指南 ](https://github.com/CyC2018/Backend-Interview-Guide)
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<!-- GFM-TOC -->
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* [一、运行时数据区域](#一运行时数据区域)
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* [程序计数器](#程序计数器)
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* [程序计数器](#程序计数器)
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* [Java 虚拟机栈](#java-虚拟机栈)
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* [本地方法栈](#本地方法栈)
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* [类加载器分类](#类加载器分类)
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* [双亲委派模型](#双亲委派模型)
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* [自定义类加载器实现](#自定义类加载器实现)
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* [参考资料](#参考资料)
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* [本地方法栈](#本地方法栈)
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* [堆](#堆)
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* [方法区](#方法区)
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* [运行时常量池](#运行时常量池)
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* [直接内存](#直接内存)
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* [二、垃圾收集](#二垃圾收集)
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* [判断一个对象是否可被回收](#判断一个对象是否可被回收)
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* [引用类型](#引用类型)
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* [垃圾收集算法](#垃圾收集算法)
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* [垃圾收集器](#垃圾收集器)
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* [三、内存分配与回收策略](#三内存分配与回收策略)
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* [Minor GC 和 Full GC](#minor-gc-和-full-gc)
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* [内存分配策略](#内存分配策略)
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* [Full GC 的触发条件](#full-gc-的触发条件)
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* [四、类加载机制](#四类加载机制)
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* [类的生命周期](#类的生命周期)
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* [类加载过程](#类加载过程)
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* [类初始化时机](#类初始化时机)
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* [类与类加载器](#类与类加载器)
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* [类加载器分类](#类加载器分类)
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* [双亲委派模型](#双亲委派模型)
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* [自定义类加载器实现](#自定义类加载器实现)
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* [参考资料](#参考资料)
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<!-- GFM-TOC -->
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# 一、运行时数据区域
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<div align="center"> <img src="pics/b01e12b7-6cfc-485b-a03e-a575e6f7b773.jpg"/> </div><br>
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<div align="center"> <img src="pics/14ab3de0-0d48-4466-9ea7-90b9be822034_200.png" width="500px"> </div><br>
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## 程序计数器
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记录正在执行的虚拟机字节码指令的地址(如果正在执行的是本地方法则为空)。
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## Java 虚拟机栈# 一、运行时数据区域
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<div align="center"> <img src="pics/14ab3de0-0d48-4466-9ea7-90b9be822034_200.png" width="500px"> </div><br>
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## 程序计数器
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