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<title>轻松学Java（Head First Java） - Yet another Chinese Head First Java book.</title>
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<h1 id="java-编程学习项目-"><a class="header" href="#java-编程学习项目-">Java 编程学习项目 ☕️</a></h1>
<p>这是一个学习 Java 的项目。使用 Eclipse IDE/VIM、Gradle/NPM 构建工具。后期会涉及到 NPM 的使用。主要学习 Java 的基础知识，Java 本地应用程序的编写。 <strong>项目使用 JDK <code>11.0.12</code></strong> 语言环境。</p>
<p>在线阅读 <a href="https://java.xfoss.com">java.xfoss.com</a>。</p>
<hr />
<h2 id="在本地阅读"><a class="header" href="#在本地阅读">在本地阅读</a></h2>
<p>在本地阅读本书，需要安装 <code>mdbook</code> 程序。根据操作系统的不同，安装 <code>mdbook</code> 程序有所不同。</p>
<h3 id="在-linux-系统上"><a class="header" href="#在-linux-系统上">在 Linux 系统上</a></h3>
<pre><code class="language-console">curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
cargo install mdbook
</code></pre>
<h3 id="在-windows-上"><a class="header" href="#在-windows-上">在 Windows 上</a></h3>
<p>在 “Powershell（管理员）”（"Administrator: Windows Powershell"） 中，先安装 <code>choco</code></p>
<pre><code class="language-powershell">Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
</code></pre>
<p>经由 <code>choco</code> 安装 <code>msys2</code></p>
<pre><code class="language-powershell">choco install -y msys2
</code></pre>
<p>在 <code>msys2</code> 中安装 <code>mdbook</code></p>
<pre><code class="language-console">pacman -S mingw-w64-x86_64-mdbook
</code></pre>
<p>安装好 <code>mdbook</code> 后, 带一些命令行参数和开关运行服务器：</p>
<pre><code class="language-console">mdbook serve ~/rust-lang-zh_CN -p 8080 -n 127.0.0.1 --open
</code></pre>
<blockquote>
<p>注：当在 Windows 系统上时，咱们要在 <code>msys2</code> 的终端窗口中运行此命令。</p>
</blockquote>
<p>此时，将在操作系统的默认浏览器中，打开本书。</p>
<hr />
<h2 id="0-环境搭建"><a class="header" href="#0-环境搭建">0. 环境搭建</a></h2>
<p>本项目是在 Ubuntu Linux 20.04 LTS 上进行的。</p>
<ul>
<li>
<p>安装JDK</p>
<p>JDK的当前LTS版是 <code>JDK 17.0.1</code>（Oracle, 2021-11），你可以直接从 <a href="https://jdk.java.net/java-se-ri/11">Java Downloads | jdk.java.net</a> 下载。openjdk-11+28_linux-x64_bin.tar.gz` 压缩包有 178.9M 大小。</p>
<p>运行下面的命令，就安装好 OpenJDK 了。</p>
</li>
</ul>
<pre><code class="language-bash">$sudo tar xf /path/to/openjdk-11+28_linux-x64_bin.tar.gz -C /opt/
$sudo ln -s /opt/openjdk-11+28 /opt/jdk
$sudo update-alternatives --install "/usr/bin/java" "java" "/opt/jdk/bin/java" 1
$sudo update-alternatives --install "/usr/bin/javac" "javac" "/opt/jdk/bin/javac" 1
</code></pre>
<p>运行 <code>$java -version</code> 与 <code>$javac -version</code> 测试 JDK 是否安装妥当。</p>
<ul>
<li>
<p>安装 <a href="https://gradle.org/">Gradle</a></p>
<p>参考 Gradle 官网上使用 <a href="http://sdkman.io/">SDKMAN!</a> 直接安装即可。</p>
</li>
<li>
<p>安装Maven</p>
<p><a href="http://maven.apache.org/">Apache Maven</a> 可以直接下载，下载到的 <code>apache-maven-3.8.4-bin.tar.gz</code>压缩包，大小约 9M，安装步骤与JDK的略有不同：</p>
</li>
</ul>
<pre><code class="language-bash">$sudo tar xf /path/to/apache-maven-3.8.4-bin.tar.gz -C /opt/
$sudo ln -s /opt/apache-maven-3.8.4 /opt/mvn
$sudo vim.gtk /etc/profile.d/mvn.sh
$sudo chmod +x /etc/profile.d/mvn.sh
</code></pre>
<p>其中建立了一个 <code>/etc/profile.d/mvn.sh</code> 文件，并修改为了可执行文件。该文件的内容为：</p>
<pre><code class="language-sh">export JAVA_HOME=/opt/jdk
export M2_HOME=/opt/mvn
export MAVEN_HOME=/opt/mvn
export PATH=${M2_HOME}/bin:${PATH}
</code></pre>
<p>随后可将国内的华为 MAVEN 代码仓库，设置为MAVEN的默认代码仓库。运行如下命令：</p>
<pre><code class="language-bash">$if [ -d $HOME"/.m2" ]; then :; else echo "~/.abc not exist. Now create"; mkdir $HOME"/.m2"; fi
$wget -qO ~/.m2/settings.xml https://mirrors.huaweicloud.com/api/v1/configurations/maven?
</code></pre>
<ul>
<li>安装NVM</li>
<li>配置 <code>~/.vimrc</code></li>
</ul>
<h2 id="1-关于文件目录结构"><a class="header" href="#1-关于文件目录结构">1. 关于文件/目录结构</a></h2>
<p>在编写 Java 程序时，使用 Maven 构建，必须以这样的 <code>src/main/java/com/xfoss/learningJava/*.java</code> 的文件/目录结构，否则会报错：</p>
<pre><code class="language-bash">peng@uDesktop:~/eclipse-workspace/learningJava$ java -jar target/com.xfoss.learningJava-0.0.1.jar
Error: Could not find or load main class com.xfoss.learningJava.PhraseOMatic
Caused by: java.lang.ClassNotFoundException: com.xfoss.learningJava.PhraseOMatic
</code></pre>
<blockquote>
<p>同时，<code>packege com.xfoss.com.learningJava;</code> 对应的包 <code>com.xfoss.learningJava</code> 必须以这个名字命名，这也是上面目录中 <code>/com/xfoss/learningJava</code> 的来源。</p>
</blockquote>
<h2 id="2-使用-exec-maven-plugin"><a class="header" href="#2-使用-exec-maven-plugin">2. 使用 <code>exec-maven-plugin</code></a></h2>
<p>使用这个插件，可以开启 <code>mvn exec:java</code> 命令，实时运行（正在）编写的 Java 程序。该插件支持两种运行模式，一种是在 Maven 所在线程里运行（需要修改 MAVEN 运行参数 <code>export MAVEN_OPTS=-Xmx1024m</code>，以增加JVM虚拟机的运行内存）；另一种以独立线程运行（尚需测试）。</p>
<h2 id="3-buildgradlekts-文件中的-kotlin-dsl-语法"><a class="header" href="#3-buildgradlekts-文件中的-kotlin-dsl-语法">3. <code>build.gradle.kts</code> 文件中的 kotlin dsl 语法</a></h2>
<p>Kotlin DSL, 领域特定语言，Domain Specific Language</p>
<blockquote>
<p>参考： <a href="https://juejin.cn/post/6844903569372479501">Kotlin 之美 -- DSL 篇</a></p>
</blockquote>
<h2 id="目录"><a class="header" href="#目录">目录</a></h2>
<h3 id="基础"><a class="header" href="#基础">基础</a></h3>
<ul>
<li><a href="docs/Ch02_Class_and_Object_A_Trip_to_Objectville.html">类与对象：对象村之旅</a></li>
<li><a href="docs/Ch03_Primitives_and_References_Know_Your_Variables.html">原生与引用：熟知你的变量</a></li>
<li><a href="docs/Ch04_Methods_Use_Instance_Variables_How_Objects_Behave.html">方法对实例变量的使用：对象的行为方式</a></li>
<li><a href="docs/Ch05_Writing_a_Program_Extra-Strength_Methods.html">实战编程：给方法赋能</a></li>
<li><a href="docs/Ch06_Get_to_Know_The_Java_API_Using_the_Java_Library.html">了解Java API：使用Java的库</a></li>
</ul>
<h3 id="继承和多态机制"><a class="header" href="#继承和多态机制">继承和多态机制</a></h3>
<ul>
<li><a href="docs/Ch07_Inheritance_and_Polymorphism_Better_Living_in_Objectville.html">继承与多态：追求对象村的更好生活</a></li>
<li><a href="docs/Ch08_Interfaces_and_Abstract_Classes.html">接口与抽象类</a></li>
</ul>
<h3 id="编译器堆与栈"><a class="header" href="#编译器堆与栈">编译器、堆与栈</a></h3>
<ul>
<li><a href="docs/Ch09_Constructors_and_Garbage_Collection_Life_and_Death_of_an_Object.html">构造器与垃圾回收: 对象的生与死</a></li>
<li><a href="docs/Ch10_Numbers_and_Statics_Numbers_Matter.html">数字与静态值：数字为要</a></li>
<li><a href="docs/Ch11_Exception_Handling_Risky_Behavior.html">例外处理：危险行为</a></li>
</ul>
<h3 id="gui"><a class="header" href="#gui">GUI</a></h3>
<ul>
<li><a href="docs/Ch12_Getting_GUI_A_Very_Graphic_Story.html">获得GUI：一个甚为形象的故事</a></li>
<li><a href="docs/Ch13_Using_Swing_Work_on_Your_Swing.html">运用 <code>Swing</code>: 在 <code>Swing</code> 上干活</a></li>
</ul>
<h3 id="对象序列化与数据结构"><a class="header" href="#对象序列化与数据结构">对象序列化与数据结构</a></h3>
<ul>
<li><a href="docs/Ch14_Serialization_and_File_I_O_Saving_Objects.html">对象序列化与文件的输入/输出：对象保存</a></li>
<li><a href="docs/Ch15_Networking_and_Threads_Make_a_Connection.html">联网与线程：构造连接</a></li>
<li><a href="docs/Ch16_Collections_and_Generics_Data_Structure.html">集合与泛型：数据结构</a></li>
</ul>
<h3 id="完结"><a class="header" href="#完结">完结</a></h3>
<ul>
<li><a href="docs/Ch17_Package_JARs_And_Deployment_Release_Your_Code.html">打包、JARS与部署：发布代码</a></li>
<li><a href="docs/Ch18_Remote_Deployment_with_RMI_Distributed_Computing.html">使用 RMI 特性进行远端部署：分布式计算</a></li>
</ul>
<h3 id="附录"><a class="header" href="#附录">附录</a></h3>
<ul>
<li><a href="docs/Ch19_Appendix.html">附录 A：十个本书未列入正式章节的方面</a></li>
<li><a href="docs/Ch20_Appendix_B.html">附录 B: 其他要点</a></li>
</ul>
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