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Modify the drawing bed address to fix the problem that the picture cannot be displayed
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01-类加载子系统/01-类加载子系统.md

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# 类加载子系统
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![JVM底层体系](https://gitee.com/ShaoxiongDu/imageBed/raw/master//images/JVM%E5%BA%95%E5%B1%82%E4%BD%93%E7%B3%BB.jpg)
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![JVM底层体系](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051414804.jpg)
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> 代码编译的结果从本地机器指令码转化为字节码,是存储格式发展的一小步,但却是编程语言发展的一大步
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## 图示
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![类加载子系统](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210617110918905.png)
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![类加载子系统](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051415584.png)
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## 作用
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## 类加载器扮演的角色
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![image-20210617111632499](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210617111632499.png)
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![image-20210617111632499](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051414783.png)
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- Car.class存放于本地硬盘中,在运行的时候,JVM将Car.class文件加载到JVM中,被称为DNA元数据模板
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01-类加载子系统/02-类加载过程.md

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# 类加载的过程
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![image-20210730191532573](https://gitee.com/ShaoxiongDu/imageBed/raw/master//images/image-20210730191532573.png)
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![image-20210730191532573](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051415812.png)
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类加载的过程主要分为三个阶段 加载,链接,初始化。 而链接阶段又可以细分为验证,准备,解析三个子阶段。
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## 链接过程
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![加载示例](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210617145249791.png)
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![加载示例](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051415807.png)
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1. ### 验证(Verify)
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执行结果如下: 当一条线程死循环在CInit处,别的线程也会阻塞。
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![image-20210730195642762](https://gitee.com/ShaoxiongDu/imageBed/raw/master//images/image-20210730195642762.png)
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![image-20210730195642762](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051415564.png)

01-类加载子系统/03-类加载器的分类.md

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无论类加载器的类型如何划分,在程序中我们最常见的类加载器始终只有三个,如下所示:
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![image-20210730200638388](https://gitee.com/ShaoxiongDu/imageBed/raw/master//images/image-20210730200638388.png)
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![image-20210730200638388](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051415727.png)
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- ### 启动类加载器
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01-类加载子系统/04-类加载器的常用方法.md

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## ClassLoader继承关系
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![image-20210617214555582](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210617214555582.png)
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![image-20210617214555582](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051415566.png)
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## 获取ClassLoader的途径
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![image-20210617214611472](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210617214611472.png)
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![image-20210617214611472](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051415647.png)

01-类加载子系统/05-双亲委派机制.md

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## 工作原理
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![image-20210617212921462](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210617212921462.png)
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![image-20210617212921462](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051416768.png)
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1. ##### 如果一个类加载器收到了类加载的请求,它并不会自己加载,而是先把请求委托给父类的加载器执行
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02-运行时数据区/01-运行时数据区内部结构.md

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# 运行时数据区内部结构
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![](https://gitee.com/ShaoxiongDu/imageBed/raw/master//images/JVM%E5%BA%95%E5%B1%82%E4%BD%93%E7%B3%BB.jpg)
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![](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051416645.jpg)
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## 一、内存
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内存是非常重要的系统资源,是硬盘和cpu的中间仓库及桥梁,承载着操作系统和应用程序的实时运行。JVM内存布局规定了JAVA在运行过程中内存申请、分配、管理的策略,保证了JVM的高效稳定运行。**不同的jvm对于内存的划分方式和管理机制存在着部分差异**(对于Hotspot主要指方法区)
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## 二、运行时数据区在JVM中的位置
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![运行时数据区在JVM中的位置](https://gitee.com/ShaoxiongDu/imageBed/raw/master/%E7%AC%AC03%E7%AB%A0_%E5%BC%95%E5%85%A5%E8%BF%90%E8%A1%8C%E6%97%B6%E6%95%B0%E6%8D%AE%E5%8C%BA.jpg)
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![运行时数据区在JVM中的位置](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051416985.jpg)
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## 三、运行时数据区体内部结构
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![](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210618145119065.png)
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![](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051416887.png)
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> 一个进程对应一个jvm实例,一个运行时数据区,又包含多个线程,这些线程共享了方法区和堆,每个线程包含了程序计数器、本地方法栈和虚拟机栈。
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##### 注: 方法区对应JDK8之后的元数据区
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- 其中有一些会随着虚拟机启动而创建,随着虚拟机退出而销毁,红色区域部分
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- 另外一些则是与线程一一对应的,这些与线程对应的数据区域会随着线程开始和结束而创建和销毁。灰色区域部分
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![image-20210618141258229](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210618141258229.png)
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![image-20210618141258229](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051416160.png)
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每一个JVM实例都对应一个RunTime实例,即运行时环境。相当于上图中的框内部分。
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README.md

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> 开源项目推荐: [Java成长之路](http://www.github.com/shaoxiongdu/java-notes) Java技术栈的全套知识点总结
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<img src="https://gitee.com/ShaoxiongDu/imageBed/raw/master/info.jpg" style="width:500px" >
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<br>
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![image-20220805101528860](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051015888.png)
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<div align="center">
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<h2><a href="https://www.jvmstudy.top" target="_blank">在线站点(阅读体验更好)</a></h2>
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<img src="https://img.shields.io/badge/LICENSE-MIT-orange"/>
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<img src="https://visitor-badge.glitch.me/badge?page_id=shaoxiongdu.JVMStudy">
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</div>
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[![Stargazers over time](https://starchart.cc/shaoxiongdu/JVMStudy.svg)](https://github.com/shaoxiongdu/JVMStudy)
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## 一、思维导图
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![JVMStudy](https://images-1301128659.cos.ap-beijing.myqcloud.com/JVMStudy.png)
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![JVMStudy](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051014144.png)
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## 二、清单
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### 我们的目标是:【分享好玩的项目,挖掘开源的价值】。
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> ![Github推荐](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210820144130666.png)
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> ![Github推荐](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051014715.png)
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## 五、反馈及改进
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> 4. 感谢GitHub提供代码仓库平台
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> 5. 感谢在线站点生成器 [docsify](https://docsify.js.org/) 提供的在线站点生成功能
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thePublic.md

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### 我们的目标是:【分享好玩的项目,挖掘开源的价值】。
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> ![Github推荐](https://gitee.com/ShaoxiongDu/imageBed/raw/master/image-20210820144130666.png)
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> ![Github推荐](https://images-1301128659.cos.ap-beijing.myqcloud.com/MacBookPro202208051016894.png)
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