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程序计数器

用于记住下一条执行指令的地址, 线程之间切换，获取到了时间片，将获取程序计数器中的指令进行执行。
并且线程私有
不会有内存溢出问题


虚拟机栈(栈)
先进后出, 存储非native的Java方法(栈帧)，执行新方法时会将方法放入栈中，并且执行完reutrn或者抛出异常，将会弹栈
设置大小 -Xss2024k

本地方法栈
与虚拟机栈最大区别是存入的是native方法

内存溢出

栈内存溢出:  递归调用方法，栈帧过大(栈帧容量大于栈内存)
堆内存溢出：


线程运行诊断

用top定位那个进程对cpu的占用过高或死锁
ps H -eo pid,tid,%cpu | grep 进程id (来定位那个线程导致的)
jstack 进程id (其中的线程id是16进制的，ps出来的是10进制)
最终可定位到代码行数


堆

通过new关键字，创建的对象
线程共享，存在线程安全问题
存在垃圾回收机制
设置大小 -Xmx 1024k


堆内存溢出
大量新建对象存在堆中无法得到回收
123456List list = new ArrayList&lt;&gt;( ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/blog/2023/09/17/node%E5%A4%9A%E7%89%88%E6%9C%AC%E7%AE%A1%E7%90%86/" title="node多版本管理"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://source.fomal.cc/img/default_cover_47.webp" onerror="this.onerror=null;this.src='/blog/img/404.jpg'" alt="node多版本管理"></a></div><div class="recent-post-info"><a class="article-title" href="/blog/2023/09/17/node%E5%A4%9A%E7%89%88%E6%9C%AC%E7%AE%A1%E7%90%86/" title="node多版本管理">node多版本管理</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-09-17T06:09:30.000Z" title="发表于 2023-09-17 14:09:30">2023-09-17</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-09-17T06:20:30.978Z" title="更新于 2023-09-17 14:20:30">2023-09-17</time></span></div><div class="content">nvm是什么
nvm全英文也叫node.js version management，是一个nodejs的版本管理工具。nvm和n都是node.js版本管理工具，为了解决node.js各种版本存在不兼容现象可以通过它可以安装和切换不同版本的node.js。

下载

github下载地址


安装
直接next

换源
将下面两个粘贴到 settings.txt 中
阿里：
npm_mirror https://npmmirror.com/mirrors/npm/	node_mirror https://npmmirror.com/mirrors/node/
腾讯：
nvm npm_mirror http://mirrors.cloud.tencent.com/npm/nvm node_mirror http://mirrors.cloud.tencent.com/nodejs-release/


常用指令

nvm arch：显示node是运行在32位还是64位。
nvm install &lt;version&gt; [arch] ：安装node， version是特定版本也可以 ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/blog/2023/09/16/Spring%E6%98%AF%E5%A6%82%E4%BD%95%E8%A7%A3%E5%86%B3%E5%BE%AA%E7%8E%AF%E4%BE%9D%E8%B5%96%E7%9A%84/" title="Spring是如何解决循环依赖的"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://source.fomal.cc/img/default_cover_46.webp" onerror="this.onerror=null;this.src='/blog/img/404.jpg'" alt="Spring是如何解决循环依赖的"></a></div><div class="recent-post-info"><a class="article-title" href="/blog/2023/09/16/Spring%E6%98%AF%E5%A6%82%E4%BD%95%E8%A7%A3%E5%86%B3%E5%BE%AA%E7%8E%AF%E4%BE%9D%E8%B5%96%E7%9A%84/" title="Spring是如何解决循环依赖的">Spring是如何解决循环依赖的</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-09-16T12:09:34.000Z" title="发表于 2023-09-16 20:09:34">2023-09-16</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-09-16T12:06:34.542Z" title="更新于 2023-09-16 20:06:34">2023-09-16</time></span></div><div class="content">什么是循环依赖?
有两个类，一个是A、一个是B。并且A和B互相引用了对象

A class123456public class A &#123;	@Autowired	B b;	String name;	int age;&#125;

B class1234567public class B &#123;	@Autowired	A a;	String name;	int age;&#125;

Spring解决循环依赖步骤
1、创建A
2、将lambda放入三级缓存中
3、填充属性
4、缓存中找


5、没找到6、创建B
7、将lambda放入三级缓存中
8、填充属性
9、缓存中找A再次去doGetBean，从三级缓存中拿

10、找到了填充到B
11、将B填充到一级缓存中
12、将一级缓冲中B填充到A
13、初始化A
14、将A放入到一级缓存中
</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/blog/2023/09/07/Mybatis%E6%B3%A8%E5%86%8C%E6%8F%92%E4%BB%B6/" title="Mybatis注册插件"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://source.fomal.cc/img/default_cover_42.webp" onerror="this.onerror=null;this.src='/blog/img/404.jpg'" alt="Mybatis注册插件"></a></div><div class="recent-post-info"><a class="article-title" href="/blog/2023/09/07/Mybatis%E6%B3%A8%E5%86%8C%E6%8F%92%E4%BB%B6/" title="Mybatis注册插件">Mybatis注册插件</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-09-07T03:09:38.000Z" title="发表于 2023-09-07 11:09:38">2023-09-07</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-09-07T03:01:38.685Z" title="更新于 2023-09-07 11:01:38">2023-09-07</time></span></div><div class="content">Configuration
可以对下面四个地方进行插件注册，它们都是通过 interceptorChain.pluginAll(…); 来注册插件


InterceptorChain12345678910111213public class InterceptorChain &#123;  private final List&lt;Interceptor&gt; interceptors = new ArrayList&lt;&gt;();  // 会去遍历我们在mybatis中配置的插件  public Object pluginAll(Object target) &#123;    for (Interceptor interceptor : interceptors) &#123;      target = interceptor.plugin(target);    &#125;    return target;  &#125; .....&#125;

Interceptor1234567891011121314151617public interface Inte ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/blog/2023/09/04/HaSee%E7%AC%94%E8%AE%B0%E6%9C%AC%E8%9C%82%E9%B8%A3%E6%8A%A5%E8%AD%A6%E5%A4%84%E7%90%86/" title="HaSee笔记本蜂鸣报警处理"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://source.fomal.cc/img/default_cover_20.webp" onerror="this.onerror=null;this.src='/blog/img/404.jpg'" alt="HaSee笔记本蜂鸣报警处理"></a></div><div class="recent-post-info"><a class="article-title" href="/blog/2023/09/04/HaSee%E7%AC%94%E8%AE%B0%E6%9C%AC%E8%9C%82%E9%B8%A3%E6%8A%A5%E8%AD%A6%E5%A4%84%E7%90%86/" title="HaSee笔记本蜂鸣报警处理">HaSee笔记本蜂鸣报警处理</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-09-04T04:09:05.000Z" title="发表于 2023-09-04 12:09:05">2023-09-04</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-09-04T04:03:05.756Z" title="更新于 2023-09-04 12:03:05">2023-09-04</time></span></div><div class="content">神舟笔记本异常处理下方解决问题都是有特定原因, 并不是万能解决方法。


出现花屏(很早之前问题)
开机高温会出现蜂鸣然后关机


花屏解决已知造成原因及结果

期间我添加过一根内存(那根内存是以前坏了的笔记本上拆下来的)
花屏问题是随机的, 并不是运行某个软件或者某个时间段会造成
问题是我装了内存之后才产生的


尝试解决

可能内存松了, 重新插一次(失败)
显卡是矿机?(原因2可以说明大概率并不是这个问题, 再尝试其他解决方法)
更换同品牌出厂内存(完美解决)


解析

可能是上一根内存与出厂内存不兼容
可能是上一根内存本身损坏了已经


高温蜂鸣解决已知造成原因及结果

高温后就会蜂鸣
开机有几率会造成风扇狂转
疑似降不了温度
当前发生问题的一个月前就发生过一次


尝试解决

主板问题??(有问题为什么每次都是高温才蜂鸣,并且风扇是正常转动的，只是莫名的快，像是降不了温度, 有可能但是不大。先尝试其他解决)
给风扇去灰(未解决)
拆开CPU、显卡挡板，发现硅脂已经干了(更换硅脂，完美解决)


解析

高温降不了温度，并且风扇转动的很勤
使用率较高，出厂硅脂并不是很好，长时 ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/blog/2023/09/04/JUC%E5%B8%B8%E7%94%A8%E5%B7%A5%E5%85%B7%E7%B1%BB%E6%BA%90%E7%A0%81%E5%88%86%E6%9E%90/" title="JUC常用工具类源码分析"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://source.fomal.cc/img/default_cover_50.webp" onerror="this.onerror=null;this.src='/blog/img/404.jpg'" alt="JUC常用工具类源码分析"></a></div><div class="recent-post-info"><a class="article-title" href="/blog/2023/09/04/JUC%E5%B8%B8%E7%94%A8%E5%B7%A5%E5%85%B7%E7%B1%BB%E6%BA%90%E7%A0%81%E5%88%86%E6%9E%90/" title="JUC常用工具类源码分析">JUC常用工具类源码分析</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-09-04T02:09:17.000Z" title="发表于 2023-09-04 10:09:17">2023-09-04</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-09-04T02:58:17.219Z" title="更新于 2023-09-04 10:58:17">2023-09-04</time></span></div><div class="content">ReentrantLock
一个可重入，可多条件变量，可超时的锁

new12345678// 无参非公平public ReentrantLock() &#123;    sync = new NonfairSync();&#125;// 公平或者非公平public ReentrantLock(boolean fair) &#123;    sync = fair ? new FairSync() : new NonfairSync();&#125;


Node1234567891011121314151617181920212223242526272829303132333435363738394041424344  static final class Node &#123;      static final Node SHARED = new Node();      static final Node EXCLUSIVE = null;      // 状态码      static final int CANCELLED =  1;      static final  ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/blog/2023/08/28/HashMap%E6%BA%90%E7%A0%81%E5%88%86%E6%9E%90/" title="HashMap源码分析"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://source.fomal.cc/img/default_cover_45.webp" onerror="this.onerror=null;this.src='/blog/img/404.jpg'" alt="HashMap源码分析"></a></div><div class="recent-post-info"><a class="article-title" href="/blog/2023/08/28/HashMap%E6%BA%90%E7%A0%81%E5%88%86%E6%9E%90/" title="HashMap源码分析">HashMap源码分析</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-08-28T09:08:30.000Z" title="发表于 2023-08-28 17:08:30">2023-08-28</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-08-28T09:04:30.790Z" title="更新于 2023-08-28 17:04:30">2023-08-28</time></span></div><div class="content">HashMap
key、value形式存储数据
JDK8：数组 + 链表&#x2F;红黑树

hash12345static final int hash(Object key) &#123;    int h;    // hashCode ^ hashCode &gt;&gt;&gt; 16，可防止一些特殊的hashCode例如Double、Float，因为它们的低16位基本全是0    return (key == null) ? 0 : (h = key.hashCode()) ^ (h &gt;&gt;&gt; 16);&#125;

get123456789101112131415161718192021222324252627282930public V get(Object key) &#123;    Node&lt;K,V&gt; e;    return (e = getNode(hash(key), key)) == null ? null : e.value;&#125;final Node&lt;K,V&gt; getNode(int hash, Objec ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/blog/2023/08/27/Mybatis%E6%BA%90%E7%A0%81%E5%88%86%E6%9E%90/" title="Mybatis源码分析"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://source.fomal.cc/img/default_cover_38.webp" onerror="this.onerror=null;this.src='/blog/img/404.jpg'" alt="Mybatis源码分析"></a></div><div class="recent-post-info"><a class="article-title" href="/blog/2023/08/27/Mybatis%E6%BA%90%E7%A0%81%E5%88%86%E6%9E%90/" title="Mybatis源码分析">Mybatis源码分析</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-08-26T16:08:14.000Z" title="发表于 2023-08-27 00:08:14">2023-08-27</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-08-26T16:26:14.802Z" title="更新于 2023-08-27 00:26:14">2023-08-27</time></span></div><div class="content">类加载器
Java自带有三个类加载器


版本号12345&lt;dependency&gt;    &lt;groupId&gt;org.mybatis&lt;/groupId&gt;    &lt;artifactId&gt;mybatis&lt;/artifactId&gt;    &lt;version&gt;3.5.4&lt;/version&gt;&lt;/dependency&gt;

1

12345678910111213141516171819202122public static void main(String[] args) &#123;    //classpath下的    System.out.println(BindingException.class.getClassLoader());    // rt.jar包中的    System.out.println(String.class.getClassLoader());&#125;sun.misc.Launcher$AppClassLoader@18b4aac2 // App ClassLoad ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/blog/2023/08/27/ArrayList%E6%BA%90%E7%A0%81/" title="ArrayList源码"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://source.fomal.cc/img/default_cover_13.webp" onerror="this.onerror=null;this.src='/blog/img/404.jpg'" alt="ArrayList源码"></a></div><div class="recent-post-info"><a class="article-title" href="/blog/2023/08/27/ArrayList%E6%BA%90%E7%A0%81/" title="ArrayList源码">ArrayList源码</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-08-26T16:08:13.000Z" title="发表于 2023-08-27 00:08:13">2023-08-27</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-08-26T16:26:13.763Z" title="更新于 2023-08-27 00:26:13">2023-08-27</time></span></div><div class="content">ArrayList
一个可自动扩容的对象数组

new默认情况下数组为一个空数组，你通过无参构造新建
12345private static final Object[] DEFAULTCAPACITY_EMPTY_ELEMENTDATA = &#123;&#125;;public ArrayList() &#123;    this.elementData = DEFAULTCAPACITY_EMPTY_ELEMENTDATA;&#125;

当然也可以指定数组初始化大小，你传入的容量大小，如果为0则用ArrayList自带的，否则new 一个Object[你传入的容量大小]的对象数组
123456789101112private static final Object[] EMPTY_ELEMENTDATA = &#123;&#125;;public ArrayList(int initialCapacity) &#123;    if (initialCapacity &gt; 0) &#123; // 传入的的大小 &gt; 0，则用你传入的大小        this.ele ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/blog/2023/08/27/JUC%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B/" title="JUC并发编程"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://source.fomal.cc/img/default_cover_50.webp" onerror="this.onerror=null;this.src='/blog/img/404.jpg'" alt="JUC并发编程"></a></div><div class="recent-post-info"><a class="article-title" href="/blog/2023/08/27/JUC%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B/" title="JUC并发编程">JUC并发编程</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-08-26T16:08:13.000Z" title="发表于 2023-08-27 00:08:13">2023-08-27</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-08-26T16:26:13.881Z" title="更新于 2023-08-27 00:26:13">2023-08-27</time></span></div><div class="content">进程与线程
进程：当一个程序被开启，即开启了一个进程
线程：一个进程之内可以分为多个线程、一个线程就是一个指令流、Java中线程是最小的调度单位，进程是作为资源分配的最小单位
对比：

进程基本上是互相独立的，二线程存在于进程内，是进程的一个子集
进程拥有共享的资源，如内存空间等，使其内部的线程共享
进程间通信更复杂
线程通信相对简单(因为它们共享一个进程的内存)，并且更加轻量
线程的上下文切换比进程的上下文切换成本低


并发&amp;并行

并发：同一时间应对多件事情的能力
并行：同一时间做多件事情的能力


异步同步

需要等级结果返回，才能继续运行就是同步

不需要等待结果返回，就能继续运行就是异步


同步12345678910111213public static void main(String[] args) &#123;    FileReader fileReader = new FileReader(&quot;E:\\todo_files\\login.bat&quot;);    String s = fileReader.readString();    ...</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span><a class="page-number" href="/blog/page/2/#content-inner">2</a><a class="extend next" rel="next" href="/blog/page/2/#content-inner"><i class="fas fa-chevron-right fa-fw"></i></a></div></nav></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/blog/assets/img/avatar.jpg" onerror="this.onerror=null;this.src='/blog/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">🍍</div><div class="author-info__description"></div></div><div class="card-info-data site-data is-center"><a 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