JDK详解:从入门到精通
一.什么是jdkJDK也就是Java开发工具包, 它身为整个JAVA的核心, 涵盖了Java运行环境, 也就是Java , 还有一堆诸如javac/java/jdb等的Java工具, 以及Java基础的类库, 也就是Java API包括rt.jar。JDK也就是java开发工具包, 于其安装目录之下存在五个文件夹, 以及一些描述文件, 还有一个src压缩文件, 其中bin、、lib、jre这四个文件夹发挥作用。二、jdk的作用可用于Java开发以及运行的工具是JDK和JRE, 其中JDK涵盖了JRE, 然而JRE能够单独进行安装。JRE乃Java的简称, 是Java程序运行的环境。既然是运行, 那必然要涵盖JVM, 也就是常说的Java虚拟机, 还有所有Java类库的class文件皆是位于lib目录下, 且全都被打包成了jar。至于其上的虚拟机系哪个文件呢? 便是/bin/中的jvm.dll。Java开发工具包这个东西吧也就是JDK, 它呢是JDK那也就是Java Kit的简称, 其里有各式各样的类库, 还有各种工具, 除此之外呢还含有另一个JRE, 为啥包含另一个JRE呀? 并且呢/JRE/bin目录那儿, 有个事儿要说一下包含着一个文件夹, 这个文件夹呢又含有一个jvm.dll, 这表明JDK给出了一个虚拟机。另外, JDK的bin目录当中存在着各类Java程序会用到的命令, 它跟JRE的bin目录最为明显的差异便是, 只有在JDK文件之下才会有javac, 这一点是比较容易理解的, 原因在于JRE仅仅是一个运行环境罢了, 跟开发没关系。正是由于这样, 具备开发功能的JDK所包含的JRE之下才会同时存在JVM, 而仅仅当作运行环境的JRE之下, 只需要jvm.dll就足够了。三、jdk的安装和环境变量配置第一步到官网下载JDK先是第二步, 接着要去安装JDK, 这个安装, 除了安装目录可以选择修改当然也能够不进行修改之外, 其他的步骤, 就一直统统【下一步】, 是那种傻瓜式的安装方式。第三步, 进行环境变量的配置, 点击“计算机”, 选择“属性”, 再选择“高级系统设置”, 之后点击“环境变量”。第四步, 进行新建操作, 新建的对象是变量名, 其名为双引号空字符串, 变量对应的值是 C 盘下 Java 文件夹中 jdk1.8.0_191 这个路径, 也就是 JDK 的安装路径。第五步, 进行如下操作, 先将编辑指向变量名“Path”, 接着点击“新建”, 随后输入“%%\bin”, 最后点击“确定”。第六步, 进行测试, 通过按下winr组合键, 接着输入cmd, 从而进入dos窗口, 再输入java -, 最终成功打印出版信息以测出安装成功。四、环境变量详解1.为什么要配置环境变量要理解环境变量的作用我们先要明确两个概念1.用于得以指定能够被执行的文件的搜寻途径的路径, 此路径所指的是后缀为.exe的文件。2.exe文件, 这可是你桌面上快捷方式的关键所在, 当你点开快捷方式之时, 就等同于点开了这个文件。通过一个QQ例子来讲解首先进行QQ的安装, 之后, 我们并非借由快捷方式去打开它, 而是借助cmd方式进入到dos界面, 进入该界面后, 直接输入QQ, 随后出现下面这样一幅图片。理由在于, 你期望系统去运行一个程序, 你首先必须告知它这个程序所处的位置, 不然系统就会发出“WTF”的疑问。于是乎, 我们得把那 的可执行文件所在之处告知给系统, 可执行文件的位置是这样的:因此, 我们于dos界面里寻得QQ可执行文件的路径, 键入QQ, 随后QQ便开启了。但是, 你把Dos关掉之后重新进去, 输入QQ时发现, 又是上面所出现的问题, 这就表明, 要是你要从Dos去打开QQ的话, 那就必须每一次进入QQ.exe文件所在的那个路径, 每一次都得给系统QQ.exe文件的绝对路径, 如此一来会非常麻烦, 于是英雄出现了, 有一种能一劳永逸的办法就是把QQ.exe的文件路径放置在Path环境变量当中, 往后要打开QQ就不用每次都进入那个路径了, 下面这张图是配上QQ.exe路径时的path变量。然后, 在我们的dos里, 如果不给出路径, 直接输入QQ, 那么就能够直接将QQ打开了:分析得出, path变量所具备的作用是, 能够使我们于不存在该应用路径的情形下, 去打开我们所要打开的应用, 不过这存在一个前提条件, 那就是此应用必须在环境变量当中配置了路径。2.为啥要配置 一定要用 命名吗要是我们有配置多个jdk相关环境变量的需求, 那我们是不是也得把每个对应的目录都加到path里面? 如此一来path会不会看上去就乱七八糟的? 而在这种情况之下, 我们就需要用到一个变量了。在上面的编辑环境变量当中, 我们察觉到有一些运用 %% 的变量值, 然而当我们于 cmd 里查看 path 环境变量之际, 却并未发现有 %% 的字样, 反而是有个与它极为相像的 C:, 这是由于我们的系统存有一个以变量名作为变量的情况, 其变量值是 C:, 并且这个是隐藏着的, 我们没办法看到, 我们能够将这个变量名理解为我们 java 里的 int a 1; int b a; 后续的 b 等于 a, 而我们所看到的效果是 a 1, 所以 b 1而非 b a 变量名。总结1.如果我们的电脑安装了多个版本的 jdk, 那么我们仅仅需要于其中把 jdk 的目录添加进去, 然而并不用在 path 里面去添加 bin 目录的路径。2.有些开发工具, 像IDEA, 会去扫描变量, 查看电脑装了几个版本的jdk, 原因在此。3.能不采用这个当作参数名的名字, 那么存在一些软件启动是需要的, 比如说, 当你不运用这个命名时, 你就得去更改其bin目录下的.bat文件, 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1. 问题现象与背景分析最近在超融合平台遇到一个典型问题:某台CentOS虚拟机在修改CPU配置开启AVX指令集支持后,系统重启失败。通过journalctl -xe查看日志发现关键报错信息为"/mnt/centos挂载失败"。这种情况在虚拟化环境中并不罕见&#xff0…

2026/7/24 6:22:05 阅读更多 →
Live2D资源逆向工程:从加密游戏包到可编辑模型的技术拆解

Live2D资源逆向工程:从加密游戏包到可编辑模型的技术拆解

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2026/7/24 6:22:05 阅读更多 →
深入解析Crest Ocean System:实时海洋渲染架构与GPU波形生成原理

深入解析Crest Ocean System:实时海洋渲染架构与GPU波形生成原理

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2026/7/24 6:21:04 阅读更多 →

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用Highcharts 创建可拖拽三维散点立方体3D图表

用Highcharts 创建可拖拽三维散点立方体3D图表

该案例基于Highcharts scatter3d 三维散点图实现空间立方体散点可视化,核心特色:三维 X/Y/Z 三轴空间,所有散点分布在 0~10 立方体空间内;散点使用径向渐变实现立体 3D 圆球质感;支持鼠标 / 触屏拖拽画布,…

2026/7/24 0:00:29 阅读更多 →
AppCertDlls:进程创建路径上的 DLL 入口

AppCertDlls:进程创建路径上的 DLL 入口

AppCertDlls:进程创建路径上的 DLL 入口 AppCertDlls 位于 HKLM\System\CurrentControlSet\Control\Session Manager\AppCertDlls。本文的程序功能是只读列出这个键在 64 位和 32 位注册表视图中的全部值,并显示每条值的来源、名称、类型和可安全显示的数…

2026/7/24 0:00:29 阅读更多 →
我的编程之路:第一篇博客

我的编程之路:第一篇博客

大家好,我是一名编程初学者,同时这也是我编程学习之路上的第一篇博客。在这里,我想要向大家介绍我的一些想法和规划。a.自我介绍我是一个刚刚接触编程的新手,目前在学习c语言,我对编程世界充满了强烈的好奇。当然&…

2026/7/24 0:00:29 阅读更多 →

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Go语言静态资源打包方案对比与实践指南

Go语言静态资源打包方案对比与实践指南

1. 项目背景与核心需求在Go语言开发中,我们经常需要处理静态资源文件的打包问题。无论是Web应用的模板文件、前端资源,还是配置文件、证书等,都需要随程序一起分发。传统做法是将这些文件与编译后的二进制文件放在同一目录下,但这…

2026/7/24 3:59:20 阅读更多 →
Go语言实现高性能LDAP认证服务的架构与实践

Go语言实现高性能LDAP认证服务的架构与实践

1. 项目背景与核心价值LDAP(轻量级目录访问协议)作为企业级身份认证的黄金标准,已经服务了超过80%的财富500强公司。我在金融科技领域实施统一认证体系时,发现传统Java方案存在启动慢、内存占用高等痛点。而Go语言凭借其协程并发模…

2026/7/24 1:23:39 阅读更多 →
【AI面试官实战指南】:用ChatGPT模拟10类高频技术岗面试,3天提升应答精准度92%

【AI面试官实战指南】:用ChatGPT模拟10类高频技术岗面试,3天提升应答精准度92%

更多请点击: https://intelliparadigm.com 第一章:AI面试官实战指南的核心价值与适用场景 AI面试官并非替代人类HR的“黑箱工具”,而是以可解释、可审计、可迭代的方式,赋能招聘全链路的关键基础设施。其核心价值在于将主观经验沉…

2026/7/23 17:49:47 阅读更多 →

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