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classarticle-meta-wrap>span classarticle-meta>i classfas fa-thumbtack sticky>/i>span classsticky>置顶/span>span classarticle-meta__separator>|/span>/span>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2024-01-08T12:00:00.000Z title发表于 2024-01-08 20:00:00>2024-01-08/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/02-%E6%A1%86%E6%9E%B6%E4%B8%AD%E9%97%B4%E4%BB%B6/>02.框架中间件/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/02-%E6%A1%86%E6%9E%B6%E4%B8%AD%E9%97%B4%E4%BB%B6/01-spring/>01.spring/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/springboot/>springboot/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Spring/>Spring/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/SpringBoot/>SpringBoot/a>/span>/div>div classcontent>为什么springboot的jar可以直接运行？前言SpringBoot框架已经成为很多公司的标配，得益于其快速配置和容易上手，将程序员从繁杂的项目配置工作中解脱出来，将精力更多的集中在业务中，而深受程序员的喜爱。通过使用java -jar命令直接运行打包后的SpringBoot项目，不用再搭建额外的tomcat等web容器便可以启动一个web项目。 不知你有没有思考过，打包后的SpringBoot项目为什么可以直接运行呢？今天我们来一探究竟。 准备既然需要jar包，我们先准备一个，这里我通过 Spring Initializr 新建一个 springboothelloworld 空项目。 项目如下： 主启动类： 1234567891011121314package com.example.springboothelloworld;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBo .../div>/div>/div>div classrecent-post-item>div classrecent-post-info no-cover>a classarticle-title href/pages/f9619d/ titlejava的SPI机制>java的SPI机制/a>div classarticle-meta-wrap>span classarticle-meta>i classfas fa-thumbtack sticky>/i>span classsticky>置顶/span>span classarticle-meta__separator>|/span>/span>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2024-01-05T03:36:44.000Z title发表于 2024-01-05 11:36:44>2024-01-05/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/01-java/>01.java/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/01-java/01-java%E5%9F%BA%E7%A1%80/>01.java基础/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/Random/>Random/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Spring/>Spring/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/SpringBoot/>SpringBoot/a>/span>/div>div classcontent>java的SPI机制什么是SPISPI的全称是Service Provider Interface，中文名为服务提供者接口，是一种服务发现机制，基于JDK内置的动态加载实现扩展点的机制（通过在 ClassPath 路径下的 META-INF/services 文件夹查找文件，自动加载文件里所定义的类），这一机制使得框架扩展和替换组件变得容易。 SPI术语SPI由三个组件构成：Service、Service Provider、ServiceLoader Service：是一个公开的接口或抽象类，定义了一个抽象的功能模块（文件名称） Service Provider：是Service的实现类（文件内容） ServiceLoader：是SPI机制中的核心组件，负责在运行时发现并加载Service Provider SPI架构和API架构区别SPI架构Java SPI 设计理念是基于接口的编程（策略模式）＋配置文件组合实现的动态加载机制。 API架构设置 SPI的扩展是基于jar级别,API扩展是基于类级别 SPI 优缺点优点，可实现服务接口与服务实现的解耦： 服务提供者（如 spri .../div>/div>/div>div classrecent-post-item>div classrecent-post-info no-cover>a classarticle-title href/pages/Collection%E5%AE%B6%E6%97%8F/ titleCollection家族>Collection家族/a>div classarticle-meta-wrap>span classarticle-meta>i classfas fa-thumbtack sticky>/i>span classsticky>置顶/span>span classarticle-meta__separator>|/span>/span>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2021-09-22T05:44:57.000Z title发表于 2021-09-22 13:44:57>2021-09-22/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/01-java/>01.java/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/01-java/01-java%E5%9F%BA%E7%A1%80/>01.java基础/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/Collection/>Collection/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>/span>/div>div classcontent>Collection家族Collection是一个接口，是高度抽象出来的集合，它包含了集合的基本操作和属性。 什么是集合集合是存储对象的容器，面相对象语言对事物的体现都是以对象的形式，所以为了方便对多个对象的操作，存储对象，集合是存储对象最常用的一种方式。 集合的出现就是为了持有对象。集合中可以存储任意类型，而且长度可变。在程序中有可能无法预知需要多少个对象，那么用数组来装对象的话，长度不好定义，而集合解决了这样的问题。 集合和数组的区别 数组的长度是固定的，集合长度是可变的。 数组中可以存储基本数据类型，集合只能存储对象（Java集合实际存放的只是对象的引用，每个集合元素都是一个引用变量，实际内容都放在堆内存或方法区里面，但是基本数据类型是在栈内存上分配空间的，栈上的数据随时就会被收回）。 数组中存储数据类型是单一的，集合中可以存储任意类型的对象。 集合接口 上图是Java集合框架图，这边我们就只先看Iterator接口、Collection接口和其子接口。 Iterator简介Iterator的定义如下： 1public interface Iterable<T> .../div>/div>/div>div classrecent-post-item>div classrecent-post-info no-cover>a classarticle-title href/posts/2dea35e1fa5d/ title泛型相关问题>泛型相关问题/a>div classarticle-meta-wrap>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2024-01-03T03:36:44.000Z title发表于 2024-01-03 11:36:44>2024-01-03/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/01-java/>01.java/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/01-java/01-java%E5%9F%BA%E7%A1%80/>01.java基础/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/%E6%B3%9B%E5%9E%8B/>泛型/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>/span>/div>div classcontent>泛型相关问题泛型是什么 ?泛型是一种参数化类型的机制。它可以使得代码适用于各种类型，从而编写更加通用的代码，例如集合框架。 好处是什么? 保证类型安全，进行编译期错误检查，使代码具有更好的安全性和可读性。 不需要进行类型强制转换，避免了在运行时出现 ClassCastException 避免类型膨胀 如下程序，如果不使用泛型前，强转结果很容易出错： 12345678910111213public class GenericDemo { public static void main(String args) { // 不使用泛型，集合中传入的值类型不会受到限制 // 存值没有限制，取值就容易出错，容器安全性得不到保障 List list new ArrayList(); list.add("String"); list.add(10); for(Object obj : list){ // 数据取出，需要进行强转， .../div>/div>/div>div classrecent-post-item>div classrecent-post-info no-cover>a classarticle-title href/pages/RandomAccess%E6%8E%A5%E5%8F%A3%E7%9A%84%E4%BD%9C%E7%94%A8/ titleRandomAccess接口的作用>RandomAccess接口的作用/a>div classarticle-meta-wrap>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2024-01-03T03:36:44.000Z title发表于 2024-01-03 11:36:44>2024-01-03/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/01-java/>01.java/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/01-java/01-java%E5%9F%BA%E7%A1%80/>01.java基础/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/Random/>Random/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>/span>/div>div classcontent>RandomAccess接口的作用1、简介RandomAccess 接口是一个空接口，只是一个标记接口，用以标记实现的List集合具备快速随机访问的能力。 1public interface RandomAccess { } 那么什么是随机访问的能力呢？其实很简单，随机访问就是随机的访问List中的任何一个元素。所有的List实现都支持随机访问的，只是基于基本结构的不同，实现的速度不同罢了，这里的快速随机访问，那么就不是所有List集合都支持了。 ArrayList：基于数组实现，天然带下标，可以实现常量级的随机访问，复杂度为O(1)。 LinkedList：基于链表实现，随机访问需要依靠遍历实现，复杂度为O(n)。 二者的差距显而易见，所以ArrayList具备快速随机访问功能，而LinkedList没有。我们也能看到： 12public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Clonea .../div>/div>/div>div classrecent-post-item>div classrecent-post-info no-cover>a classarticle-title href/pages/ff4a52/ titleLinkedList源码分析>LinkedList源码分析/a>div classarticle-meta-wrap>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2024-01-03T03:36:44.000Z title发表于 2024-01-03 11:36:44>2024-01-03/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/01-java/>01.java/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/01-java/03-java%E6%BA%90%E7%A0%81/>03.java源码/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/LinkedList/>LinkedList/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>/span>/div>div classcontent>LinkedList 源码分析 LinkedList 简介LinkedList 是一个基于双向链表实现的集合类，经常被拿来和 ArrayList 做比较。 不过，我们在项目中一般是不会使用到 LinkedList 的，需要用到 LinkedList 的场景几乎都可以使用 ArrayList 来代替，并且，性能通常会更好！就连 LinkedList 的作者约书亚 · 布洛克（Josh Bloch）自己都说从来不会使用 LinkedList 。 另外，不要下意识地认为 LinkedList 作为链表就最适合元素增删的场景。我在上面也说了，LinkedList 仅仅在头尾插入或者删除元素的时候时间复杂度近似 O(1)，其他情况增删元素的平均时间复杂度都是 O(n) 。 LinkedList 插入和删除元素的时间复杂度？ 头部插入/删除：只需要修改头结点的指针即可完成插入/删除操作，因此时间复杂度为 O(1)。 尾部插入/删除：只需要修改尾结点的指针即可完成插入/删除操作，因此时间复杂度为 O(1)。 指定位置插入/删除：需要先移动到指定位置，再修改指定节点的指针完成插入/删除，因此需要 .../div>/div>/div>div classrecent-post-item>div classrecent-post-info no-cover>a classarticle-title href/pages/ef1f2b/ titleCopyOnWriteArrayList源码分析>CopyOnWriteArrayList源码分析/a>div classarticle-meta-wrap>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2024-01-03T03:36:44.000Z title发表于 2024-01-03 11:36:44>2024-01-03/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/01-java/>01.java/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/01-java/03-java%E6%BA%90%E7%A0%81/>03.java源码/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/CopyOnWriteArrayList/>CopyOnWriteArrayList/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Golang/>Golang/a>/span>/div>div classcontent>CopyOnWriteArrayList 简介在 JDK1.5 之前，如果想要使用并发安全的 List 只能选择 Vector。而 Vector 是一种老旧的集合，已经被淘汰。Vector 对于增删改查等方法基本都加了 synchronized，这种方式虽然能够保证同步，但这相当于对整个 Vector 加上了一把大锁，使得每个方法执行的时候都要去获得锁，导致性能非常低下。 JDK1.5 引入了 Java.util.concurrent（JUC）包，其中提供了很多线程安全且并发性能良好的容器，其中唯一的线程安全 List 实现就是 CopyOnWriteArrayList 。关于java.util.concurrent 包下常见并发容器的总结，可以看我写的这篇文章：Java 常见并发容器总结 CopyOnWriteArrayList 到底有什么厉害之处？对于大部分业务场景来说，读取操作往往是远大于写入操作的。由于读取操作不会对原有数据进行修改，因此，对于每次读取都进行加锁其实是一种资源浪费。相比之下，我们应该允许多个线程同时访问 List 的内部数据，毕竟对于读取操作来说是安全的。 这种 .../div>/div>/div>div classrecent-post-item>div classrecent-post-info no-cover>a classarticle-title href/pages/%E4%B8%BA%E4%BB%80%E4%B9%88jdk1.7%E4%B8%ADHashMap%E5%A4%B4%E6%8F%92%E5%85%A5%E4%BC%9A%E6%AD%BB%E5%BE%AA%E7%8E%AF/ title为什么jdk1.7中hashMap头插入会死循环>为什么jdk1.7中hashMap头插入会死循环/a>div classarticle-meta-wrap>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2023-12-28T09:44:57.000Z title发表于 2023-12-28 17:44:57>2023-12-28/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/01-java/>01.java/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/01-java/01-java%E5%9F%BA%E7%A1%80/>01.java基础/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/HashMap/>HashMap/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>/span>/div>div classcontent>为什么jdk1.7中HashMap头插入会死循环先说结论： 主要原因:头插法 +链表 +多线程并发 +扩容 累加到一起就会形成死循环 多线程下:建议采用ConcurrentHashMap替代 JDK1.8中，HashMap改成尾插法，解决了链表死循环的问题 一、数据插入原理由于JDK1.7中，HashMap的底层存储结构采用的是数组+链表的方法 插入数据时候采用的是头插入法 二、导致死循环的原因此时线程T1，T2节点同时指向A节点，同时线程T1,T2的下一个节点T1.next和T2.next指向B节点 开始扩容，此时假设T2的时间片用完了，进入了休眠状态，而线程T1开始执行扩容动作，一直到线程T1扩容完成以后，线程T2才被唤醒 线程T1扩容完成后的场景 线程T1执行扩容后，线程T2的指向依旧没有变化。 当线程T1执行完成后，线程T2恢复执行死循环发生了： 因为T1完成扩容之后，B节点的下一个节点就是A。而T2线程指向的首节点是A，下一个节点是B。这个时候，顺序刚好与T1扩容之前的节点顺序是相反的。T1执行完成以后的顺序是B到A，而T2执行顺序是A到B，这样A节点和B节点形成 .../div>/div>/div>div classrecent-post-item>div classrecent-post-info no-cover>a classarticle-title href/pages/71c2b2/ title从浏览器地址栏输入到页面展现到底发生什么？>从浏览器地址栏输入到页面展现到底发生什么？/a>div classarticle-meta-wrap>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2023-12-27T08:47:03.000Z title发表于 2023-12-27 16:47:03>2023-12-27/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/01-java/>01.java/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/01-java/01-java%E5%9F%BA%E7%A1%80/>01.java基础/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/tcp/>tcp/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/http/>http/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/%E6%B5%8F%E8%A7%88%E5%99%A8/>浏览器/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/HTML/>HTML/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/JavaScript/>JavaScript/a>/span>/div>div classcontent>从浏览器地址栏输入到页面展现到底发生什么？前言打开浏览器从输入网址到网页呈现在大家面前，背后到底发生了什么？经历怎么样的一个过程？先给大家来张总体流程图，具体步骤请看下文分解！ 总体来说分为以下几个过程: DNS 解析:将域名解析成 IP 地址 TCP 连接：TCP 三次握手 发送 HTTP 请求 服务器处理请求并返回 HTTP 报文 浏览器解析渲染页面 断开连接：TCP 四次挥手 一、URL 到底是啥URL（Uniform Resource Locator），统一资源定位符，用于定位互联网上资源，俗称网址。比如 http://www.w3school.com.cn/ht…，遵守以下的语法规则： scheme://host.domain:port/path/filename各部分解释如下：scheme - 定义因特网服务的类型。常见的协议有 http、https、ftp、file，其中最常见的类型是 http，而 https 则是进行加密的网络传输。host - 定义域主机（http 的默认主机是 www）domain - 定义因特网域名，比如 w3school.com.cnpo .../div>/div>/div>div classrecent-post-item>div classrecent-post-info no-cover>a classarticle-title href/posts/052b0bfb5029/ titleJVM内存结构和JAVA内存模型（JMM）>JVM内存结构和JAVA内存模型（JMM）/a>div classarticle-meta-wrap>span classpost-meta-date>i classfar fa-calendar-alt>/i>span classarticle-meta-label>发表于/span>time datetime2023-11-13T10:44:57.000Z title发表于 2023-11-13 18:44:57>2023-11-13/time>/span>span classarticle-meta>span classarticle-meta__separator>|/span>i classfas fa-inbox>/i>a classarticle-meta__categories href/categories/01-java/>01.java/a>i classfas fa-angle-right>/i>a classarticle-meta__categories href/categories/01-java/04-JVM/>04.JVM/a>/span>span classarticle-meta tags>span classarticle-meta__separator>|/span>i classfas fa-tag>/i>a classarticle-meta__tags href/tags/JAVA%E5%86%85%E5%AD%98%E6%A8%A1%E5%9E%8B/>JAVA内存模型/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/Java/>Java/a>span classarticle-meta__link>•/span>a classarticle-meta__tags href/tags/%E7%AE%97%E6%B3%95/>算法/a>/span>/div>div classcontent>JVM内存结构和JAVA内存模型前言首先JVM内存结构和JAVA内存模型是两种东西 JVM内存结构：通常被叫做JVM内存模型，也叫做Java内存区域，Java运行时数据区。 JAVA内存模型：是JMM（Java Memory Model），是定义了线程和主内存之间的抽象关系，即 JMM 定义了 JVM 在计算机内存中的工作方式。 理解好 Java 内存模型，对于我们想深入了解 Java并发编程有先导作用 JVM内存结构通过前篇学习了解，JVM可以将class 文件解释成各个平台可以识别的机器码，最终实现跨平台运行代码，这也是为什么需要JVM。 对于JVM内存模型，大体可以分为两个部分。 线程私有：虚拟机栈，本地方法栈，程序计数器 线程公有：堆，方法区 下面展开解释五大组成部分的作用 堆（Heap）在 Java 中，堆被划分成两个不同的区域：新生代 ( Young )、老年代 ( Old )。新生代 ( Young ) 又被划分为三个区域：Eden、From Survivor、To Survivor。 Java堆在虚拟机启动的时候就被创建，Java堆主要用来为类实例对象和数组 .../div>/div>/div>nav idpagination>div classpagination>span classpage-number current>1/span>a classpage-number href/page/2/#content-inner>2/a>span classspace>…/span>a classpage-number href/page/13/#content-inner>13/a>a classextend next relnext href/page/2/#content-inner>i classfas fa-chevron-right fa-fw>/i>/a>/div>/nav>/div>div classaside-content idaside-content>div classcard-widget card-info>div classis-center>div 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classcard-category-list-item parent>a classcard-category-list-link href/categories/04-%E7%AE%97%E6%B3%95/>span classcard-category-list-name>04.算法/span>span classcard-category-list-count>38/span>i classfas fa-caret-left>/i>/a>ul classcard-category-list child>li classcard-category-list-item>a classcard-category-list-link href/categories/04-%E7%AE%97%E6%B3%95/01-%E9%93%BE%E8%A1%A8/>span classcard-category-list-name>01.链表/span>span classcard-category-list-count>3/span>/a>/li>li classcard-category-list-item>a classcard-category-list-link href/categories/04-%E7%AE%97%E6%B3%95/02-%E6%A0%88%E4%B8%8E%E9%98%9F%E5%88%97/>span classcard-category-list-name>02.栈与队列/span>span classcard-category-list-count>2/span>/a>/li>li classcard-category-list-item>a classcard-category-list-link href/categories/04-%E7%AE%97%E6%B3%95/03-%E6%9F%A5%E6%89%BE%E7%AE%97%E6%B3%95/>span classcard-category-list-name>03.查找算法/span>span classcard-category-list-count>3/span>/a>/li>li classcard-category-list-item>a 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