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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Tomial's Blog</title><link>https://tomial.github.io/</link><description>Recent content on Tomial's Blog</description><generator>Hugo</generator><language>zh-cn</language><copyright>© Tomial</copyright><lastBuildDate>Thu, 26 Dec 2024 14:47:13 +0800</lastBuildDate><atom:link href="https://tomial.github.io/index.xml" rel="self" type="application/rss+xml"/><item><title>Rack</title><link>https://tomial.github.io/posts/rack/</link><pubDate>Thu, 26 Dec 2024 14:47:13 +0800</pubDate><guid>https://tomial.github.io/posts/rack/</guid><description><p>Rack既是一个规范，也是一个实现这个规范的Ruby库。</p></description></item><item><title>goroutine控制：WaitGroup解析</title><link>https://tomial.github.io/posts/goroutine/waitgroup/</link><pubDate>Thu, 29 Feb 2024 17:14:53 +0800</pubDate><guid>https://tomial.github.io/posts/goroutine/waitgroup/</guid><description><p>WaitGroup是Go经常使用的并发控制工具，它非常适合等待一组goroutine结束的场景</p></description></item><item><title>DNS</title><link>https://tomial.github.io/posts/dns/</link><pubDate>Fri, 02 Feb 2024 13:54:56 +0800</pubDate><guid>https://tomial.github.io/posts/dns/</guid><description><p>关于域名系统(Domain Name System)的笔记</p></description></item><item><title>Go Error Handling（1）</title><link>https://tomial.github.io/posts/go-error-handling-1/</link><pubDate>Fri, 12 Jan 2024 14:26:22 +0800</pubDate><guid>https://tomial.github.io/posts/go-error-handling-1/</guid><description><p>Go没有异常这类机制，与其他语言中的错误处理不太一样，而是用<code>error</code>这个built-in类型来表示错误。</p></description></item><item><title>redlock-rb: redis分布式锁的ruby实现分析</title><link>https://tomial.github.io/posts/redlock-rb/</link><pubDate>Tue, 09 Jan 2024 13:30:01 +0800</pubDate><guid>https://tomial.github.io/posts/redlock-rb/</guid><description><p>redis的文档中提供了一个由redis作者antirez实现的分布式锁：<a href="https://github.com/antirez/redlock-rb">redlock-rb</a></p></description></item><item><title>关于我</title><link>https://tomial.github.io/about/</link><pubDate>Fri, 05 Jan 2024 00:00:00 +0000</pubDate><guid>https://tomial.github.io/about/</guid><description><p>本博客主题为基于<a href="https://github.com/catppuccin/catppuccin">catppuccin</a>主题魔改的<a href="https://github.com/tomial/archie">archie</a></p>
<p>中文字体：<a href="https://github.com/lxgw/LxgwNeoXiHei">霞鹜新晰黑</a></p>
<p>代码字体：<a href="https://indestructibletype.com/Drafting/">Drafting* Mono</a></p>
<p>个人项目：</p>
<ul>
<li><a href="https://github.com/tomial/go-db">go-db</a>：一个用于学习的简单B+树数据库</li>
<li>goj: gf + React + Docker 实现的OJ系统
<ul>
<li><a href="https://github.com/tomial/goj-judger">judger</a></li>
<li><a href="https://github.com/tomial/goj-server">server</a></li>
<li><a href="https://github.com/tomial/goj-front">front</a></li>
</ul>
</li>
<li>PR: <a href="https://github.com/neovim/neovim/pull/19286">https://github.com/neovim/neovim/pull/19286</a></li>
</ul>
<p>正在学习：</p>
<p><a href="https://learnopengl.com/">LearnOpenGL</a></p>
<p><a href="https://github.com/mit-pdos/xv6-riscv">xv6-riscv</a></p>
<p><a href="https://godotengine.org/">godot</a></p></description></item><item><title>Docker bind Mounts和volume及tmpfs对比</title><link>https://tomial.github.io/posts/docker-bind-mounts%E5%92%8Cvolume%E5%8F%8Atmpfs%E5%AF%B9%E6%AF%94/</link><pubDate>Sat, 10 Apr 2021 17:37:28 +0800</pubDate><guid>https://tomial.github.io/posts/docker-bind-mounts%E5%92%8Cvolume%E5%8F%8Atmpfs%E5%AF%B9%E6%AF%94/</guid><description><p>本文总结了 bind Mounts 和 volume 及 tmpfs 三种 Docker 管理容器数据方式的区别</p></description></item><item><title>Docker Security总结</title><link>https://tomial.github.io/posts/docker-security%E6%80%BB%E7%BB%93/</link><pubDate>Tue, 06 Apr 2021 15:35:27 +0800</pubDate><guid>https://tomial.github.io/posts/docker-security%E6%80%BB%E7%BB%93/</guid><description><p>本文总结了 Docker 安全性相关的内容，主要来自 Docker 官方文档 <a href="https://docs.docker.com/engine/security/">Docker security</a> 一文。</p></description></item><item><title>Shell常用工具总结</title><link>https://tomial.github.io/posts/shell%E5%B8%B8%E7%94%A8%E5%B7%A5%E5%85%B7%E6%80%BB%E7%BB%93/</link><pubDate>Sun, 28 Mar 2021 12:47:04 +0800</pubDate><guid>https://tomial.github.io/posts/shell%E5%B8%B8%E7%94%A8%E5%B7%A5%E5%85%B7%E6%80%BB%E7%BB%93/</guid><description><p>这篇文章用来记录一些 Shell 的技巧及好用的工具</p></description></item><item><title>Go Cli工具详解(get,install,clean等)</title><link>https://tomial.github.io/posts/go-cli%E5%B7%A5%E5%85%B7%E8%AF%A6%E8%A7%A3getinstallclean%E7%AD%89/</link><pubDate>Fri, 19 Mar 2021 18:55:05 +0800</pubDate><guid>https://tomial.github.io/posts/go-cli%E5%B7%A5%E5%85%B7%E8%AF%A6%E8%A7%A3getinstallclean%E7%AD%89/</guid><description><p>本文总结了 Go 1.16 后 Go 命令行工具使用需要注意的地方</p></description></item><item><title>Hugo使用Github Action自动部署博客到Github Pages</title><link>https://tomial.github.io/posts/hugo%E4%BD%BF%E7%94%A8github-action%E8%87%AA%E5%8A%A8%E9%83%A8%E7%BD%B2%E5%8D%9A%E5%AE%A2%E5%88%B0github-pages/</link><pubDate>Thu, 11 Mar 2021 15:51:47 +0800</pubDate><guid>https://tomial.github.io/posts/hugo%E4%BD%BF%E7%94%A8github-action%E8%87%AA%E5%8A%A8%E9%83%A8%E7%BD%B2%E5%8D%9A%E5%AE%A2%E5%88%B0github-pages/</guid><description><p>github actions提供了免费的CI/CD功能，能够响应github repo的事件执行一系列自动化的操作。</p></description></item><item><title>Git Submodule使用总结</title><link>https://tomial.github.io/posts/git-submodule%E4%BD%BF%E7%94%A8%E6%80%BB%E7%BB%93/</link><pubDate>Wed, 10 Mar 2021 17:41:08 +0800</pubDate><guid>https://tomial.github.io/posts/git-submodule%E4%BD%BF%E7%94%A8%E6%80%BB%E7%BB%93/</guid><description><p>我在将博客源码上传到Github时遇到这样一个问题：</p></description></item><item><title>使用vsftpd建立FTP服务器</title><link>https://tomial.github.io/posts/%E4%BD%BF%E7%94%A8vsftpd%E5%BB%BA%E7%AB%8Bftp%E6%9C%8D%E5%8A%A1%E5%99%A8/</link><pubDate>Tue, 23 Jun 2020 18:10:45 +0000</pubDate><guid>https://tomial.github.io/posts/%E4%BD%BF%E7%94%A8vsftpd%E5%BB%BA%E7%AB%8Bftp%E6%9C%8D%E5%8A%A1%E5%99%A8/</guid><description><p>VSFTPD是一个FTP服务器软件，官网的介绍是：</p>
<blockquote>
<p><strong>Probably the most secure and fastest FTP server for UNIX-like systems.</strong></p>
</blockquote>
<p>一般在Linux建立FTP服务器都用他，首先要安装vsftpd：</p>
<p>debian系：</p></description></item><item><title>@NotNull和nullable的区别</title><link>https://tomial.github.io/posts/notnull%E5%92%8Cnullable%E7%9A%84%E5%8C%BA%E5%88%AB/</link><pubDate>Sun, 07 Jun 2020 17:02:34 +0000</pubDate><guid>https://tomial.github.io/posts/notnull%E5%92%8Cnullable%E7%9A%84%E5%8C%BA%E5%88%AB/</guid><description><h2 id="notnull">@NotNull</h2>
<p>@NotNull是Bean Validation规范里面定义的一个注解，不仅可以用在实体(Entity)类中，还可以用在别的bean验证Null值。</p></description></item><item><title>Spring Overview</title><link>https://tomial.github.io/posts/spring-overview/</link><pubDate>Sat, 16 May 2020 10:51:43 +0000</pubDate><guid>https://tomial.github.io/posts/spring-overview/</guid><description><h1 id="spring-overview">Spring Overview</h1>
<h2 id="spring这个词指的是什么">Spring这个词指的是什么？</h2>
<p>Spring一词既可以指<code>Spring Framework</code>这个Spring系列的起源框架，也可以指Spring这整个体系。<code>Spring Framework</code> 提供了许多模块供不同的应用选择，比如基于<code>Servlet</code>的<code>Spring MVC</code>，又或是与之平行关系的<code>Spring WebFlux</code></p></description></item><item><title>为什么Arrays.asList()返回的列表不能增加元素</title><link>https://tomial.github.io/posts/%E4%B8%BA%E4%BB%80%E4%B9%88arrays.aslist%E8%BF%94%E5%9B%9E%E7%9A%84%E5%88%97%E8%A1%A8%E4%B8%8D%E8%83%BD%E5%A2%9E%E5%8A%A0%E5%85%83%E7%B4%A0/</link><pubDate>Fri, 10 Apr 2020 17:49:32 +0000</pubDate><guid>https://tomial.github.io/posts/%E4%B8%BA%E4%BB%80%E4%B9%88arrays.aslist%E8%BF%94%E5%9B%9E%E7%9A%84%E5%88%97%E8%A1%A8%E4%B8%8D%E8%83%BD%E5%A2%9E%E5%8A%A0%E5%85%83%E7%B4%A0/</guid><description><div class="highlight"><div style="color:#cdd6f4;background-color:#1e1e2e;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">
<table style="border-spacing:0;padding:0;margin:0;border:0;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
<pre tabindex="0" style="color:#cdd6f4;background-color:#1e1e2e;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f849c">1
</span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f849c">2
</span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f849c">3
</span></code></pre></td>
<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
<pre tabindex="0" style="color:#cdd6f4;background-color:#1e1e2e;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-java" data-lang="java"><span style="display:flex;"><span>String<span style="color:#89dceb;font-weight:bold">[]</span> arr <span style="color:#89dceb;font-weight:bold">=</span> {<span style="color:#a6e3a1">&#34;A&#34;</span>, <span style="color:#a6e3a1">&#34;B&#34;</span>};
</span></span><span style="display:flex;"><span>List<span style="color:#89dceb;font-weight:bold">&lt;</span>String<span style="color:#89dceb;font-weight:bold">&gt;</span> list <span style="color:#89dceb;font-weight:bold">=</span> Arrays.<span style="color:#89b4fa">asList</span>(arr);
</span></span><span style="display:flex;"><span>list.<span style="color:#89b4fa">add</span>(<span style="color:#a6e3a1">&#34;C&#34;</span>); <span style="color:#6c7086;font-style:italic">//java.lang.UnsupportedOperationException</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>如果调用<code>Arrays.asList()</code>方法返回列表的add方法会抛出异常，这是什么原因呢？</p>
<p>在<code>asList</code>方法源码可以看到</p></description></item><item><title>bcrypt加密及Salts,Peppers的使用</title><link>https://tomial.github.io/posts/bcrypt%E5%8A%A0%E5%AF%86%E5%8F%8Asalts-peppers%E7%9A%84%E4%BD%BF%E7%94%A8/</link><pubDate>Sat, 07 Dec 2019 12:46:26 +0000</pubDate><guid>https://tomial.github.io/posts/bcrypt%E5%8A%A0%E5%AF%86%E5%8F%8Asalts-peppers%E7%9A%84%E4%BD%BF%E7%94%A8/</guid><description/></item><item><title>HTML初学总结</title><link>https://tomial.github.io/posts/html%E5%88%9D%E5%AD%A6%E6%80%BB%E7%BB%93/</link><pubDate>Mon, 25 Nov 2019 23:20:21 +0000</pubDate><guid>https://tomial.github.io/posts/html%E5%88%9D%E5%AD%A6%E6%80%BB%E7%BB%93/</guid><description><p>HTML全称是超文本标记语言( HyperText Markup Language )，是创建网页必备的标记语言。</p>
<p>HTML开头经常使用一个标签指定HTML的版本，这个标签告诉浏览器该HTML文件的版本是什么，比如HTML5的标签为：</p></description></item><item><title>JavaBean和Serializable,Mbeans</title><link>https://tomial.github.io/posts/javabean%E5%92%8Cserializable-mbeans/</link><pubDate>Mon, 25 Nov 2019 23:15:45 +0000</pubDate><guid>https://tomial.github.io/posts/javabean%E5%92%8Cserializable-mbeans/</guid><description><h2 id="java-bean">Java Bean</h2>
<p>JavaBean简单来说是一种约定俗成的标准。</p>
<ol>
<li>
<p>所有的属性都是<code>private</code>的</p>
</li>
<li>
<p>有一个<code>public</code>的无参构造函数</p>
</li>
<li>
<p>实现了<code>Serializable</code>接口</p>
</li>
</ol>
<p>可以看出，JavaBean就是一种惯例，按照要求实现的类就是一个JavaBean。</p></description></item><item><title>UDP检验和</title><link>https://tomial.github.io/posts/udp%E6%A3%80%E9%AA%8C%E5%92%8C/</link><pubDate>Tue, 12 Nov 2019 16:10:43 +0000</pubDate><guid>https://tomial.github.io/posts/udp%E6%A3%80%E9%AA%8C%E5%92%8C/</guid><description><h2 id="udp检验和">UDP检验和</h2>
<p>UDP 检验和提供了差错检测的功能，可以让接收方检测所接收到的UDP报文段是否存在错误。但要注意，<strong>UDP虽然提供了差错检验的功能，但对差错恢复无能为力。</strong></p></description></item><item><title>跟着官方Guide学习Spring Boot(一):Accessing-data-mysql</title><link>https://tomial.github.io/posts/%E8%B7%9F%E7%9D%80%E5%AE%98%E6%96%B9guide%E5%AD%A6%E4%B9%A0spring-boot-%E4%B8%80-accessing-data-mysql/</link><pubDate>Sun, 20 Oct 2019 20:18:22 +0000</pubDate><guid>https://tomial.github.io/posts/%E8%B7%9F%E7%9D%80%E5%AE%98%E6%96%B9guide%E5%AD%A6%E4%B9%A0spring-boot-%E4%B8%80-accessing-data-mysql/</guid><description><p>官网地址：<a href="https://spring.io/guides/gs/accessing-data-mysql/">Accessing data with MySQL</a></p>
<p>本期Guide需要：</p>
<ul>
<li>MySQL5.6或以上版本</li>
<li>一个文本编辑器/IDE</li>
<li>JDK1.8或以上版本</li>
<li>Gradle 4+或 Maven 3.2+</li>
</ul>
<h2 id="使用spring-initializr开始">使用Spring Initializr开始</h2>
<p>在Spring Initializr中选择以下依赖项：</p></description></item><item><title>如何理解REST/RESTful API</title><link>https://tomial.github.io/posts/%E5%A6%82%E4%BD%95%E7%90%86%E8%A7%A3rest-restful-api/</link><pubDate>Mon, 07 Oct 2019 22:37:50 +0000</pubDate><guid>https://tomial.github.io/posts/%E5%A6%82%E4%BD%95%E7%90%86%E8%A7%A3rest-restful-api/</guid><description><h2 id="什么是restrestful">什么是REST/RESTful?</h2>
<p>REST起源于Roy Fielding在2000年发表的<a href="https://www.ics.uci.edu/~fielding/pubs/dissertation/fielding_dissertation.pdf">博士论文</a></p>
<p>REST的意思是<strong>RE</strong>presentational <strong>S</strong>tate <strong>T</strong>ransfer，中文意思为<strong>表现层状态转移</strong>。</p></description></item><item><title>pacman、aur与yaourt的关系</title><link>https://tomial.github.io/posts/pacmanaur%E4%B8%8Eyaourt%E7%9A%84%E5%85%B3%E7%B3%BB/</link><pubDate>Wed, 25 Sep 2019 11:36:52 +0000</pubDate><guid>https://tomial.github.io/posts/pacmanaur%E4%B8%8Eyaourt%E7%9A%84%E5%85%B3%E7%B3%BB/</guid><description><h2 id="pacman">PACMAN</h2>
<p>Pacman在Arch wiki的说明如下：</p>
<blockquote>
<p>pacman软件包管理器是 Arch Linux 的一大亮点。它将一个简单的二进制包格式和易用的构建系统结合了起来(参见makepkg和ABS)。不管软件包是来自官方的 Arch 库还是用户自己创建，pacman 都能方便地管理。</p></description></item><item><title>Vim常用命令总结</title><link>https://tomial.github.io/posts/vim%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4%E6%80%BB%E7%BB%93/</link><pubDate>Wed, 14 Aug 2019 12:00:01 +0000</pubDate><guid>https://tomial.github.io/posts/vim%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4%E6%80%BB%E7%BB%93/</guid><description><p><code>&lt;C-[&gt;</code>：返回普通模式</p>
<p><code>&lt;C-a&gt;</code>：使数字加一</p>
<p><code>&lt;C-x&gt;</code>：使数字减一</p>
<p><code>{n}&lt;C-a&gt;</code>使数字加n</p>
<p><code>{n}&lt;C-x&gt;</code>：使数字减n</p></description></item><item><title>更高效的取余运算</title><link>https://tomial.github.io/posts/%E6%9B%B4%E9%AB%98%E6%95%88%E7%9A%84%E5%8F%96%E4%BD%99%E8%BF%90%E7%AE%97/</link><pubDate>Mon, 12 Aug 2019 12:30:57 +0000</pubDate><guid>https://tomial.github.io/posts/%E6%9B%B4%E9%AB%98%E6%95%88%E7%9A%84%E5%8F%96%E4%BD%99%E8%BF%90%E7%AE%97/</guid><description><p>平常的取余一般用<code>%</code>运算符，在学习<code>ArrayDeque</code>时发现其使用了另一种取余方法：</p>
<p><code>elements[head = (head - 1) &amp; (elements.length - 1)] = e;</code></p>
<p>其中<code>head</code>是该双向队列的头部下标，这段代码既可以解决下标为负的情况又可以起到取余的作用，其中<code>(head - 1) &amp; (elements.length - 1)</code>起到了对<code>elements.length</code> 取余的作用。</p></description></item><item><title>为什么Java中数组是协变的而泛型不是?</title><link>https://tomial.github.io/posts/%E4%B8%BA%E4%BB%80%E4%B9%88java%E4%B8%AD%E6%95%B0%E7%BB%84%E6%98%AF%E5%8D%8F%E5%8F%98%E7%9A%84%E8%80%8C%E6%B3%9B%E5%9E%8B%E4%B8%8D%E6%98%AF/</link><pubDate>Sat, 10 Aug 2019 18:15:14 +0000</pubDate><guid>https://tomial.github.io/posts/%E4%B8%BA%E4%BB%80%E4%B9%88java%E4%B8%AD%E6%95%B0%E7%BB%84%E6%98%AF%E5%8D%8F%E5%8F%98%E7%9A%84%E8%80%8C%E6%B3%9B%E5%9E%8B%E4%B8%8D%E6%98%AF/</guid><description><h3 id="什么是协变">什么是协变?</h3>
<p>Effective Java中写到：</p>
<p>1.数组和泛型有两个主要的不同点。第一个是数组是协变的(covariant)，而泛型是不变的(invariant)。</p>
<p>2.协变简单来说就是如果<code>X</code>是<code>Y</code>的子类型则<code>X[]</code>也是 <code>Y[]</code>的子类型。因为数组是协变的，<code>String</code>是<code>Object</code>的子类型，故：</p></description></item><item><title>ICPC Asia Urumqi 2017 B.The Difference</title><link>https://tomial.github.io/posts/icpc-asia-urumqi-2017-b-the-difference/</link><pubDate>Fri, 09 Aug 2019 17:21:45 +0000</pubDate><guid>https://tomial.github.io/posts/icpc-asia-urumqi-2017-b-the-difference/</guid><description><p>Alice was always good at math. Her only weak points were multiplication and subtraction. To help her with that, Bob presented her with the following problem.</p>
<p>He gave her four positive integers. Alice can change their order optionally. Her task is to find an order, denoted by <code>A1,A2,A3</code> and <code>A4</code>, with the maximum value of <code>A1×A2 − A3×A4</code>.</p>
<h3 id="input">Input</h3>
<p>The input contains several test cases and the first line provides an integer <code>t(1 ≤ t ≤ 100)</code>indicating the number of cases.</p></description></item><item><title>ICPC Asia Urumqi 2017 G.The Mountain</title><link>https://tomial.github.io/posts/icpc-asia-urumqi-2017-g-the-mountain/</link><pubDate>Fri, 09 Aug 2019 16:58:08 +0000</pubDate><guid>https://tomial.github.io/posts/icpc-asia-urumqi-2017-g-the-mountain/</guid><description><p>All as we know, a mountain is a large landform that stretches above the surrounding land in a limited area. If we as the tourists take a picture of a distant mountain and print it out, the image on the surface of paper will be in the shape of a particular polygon.</p>
<p>From mathematics angle we can describe the range of the mountain in the picture as a list of distinct points, denoted by<code> (x1,y1)</code> to <code>(xn,yn)</code>. The first point is at the original point of the coordinate system and the last point is lying on the <code>x-axis</code>. All points else have positive <code>y</code> coordinates and incremental <code>x </code>coordinates. Specifically, all <code>x</code> coordinates satisfy <code>0=x1&lt;x2&lt;x3&lt;...&lt;xn</code>. All <code>y</code> coordinates are positive except the first and the last points whose <code>y</code> coordinates are zeroes.</p></description></item><item><title>Leecode.1.Two Sum (两数之和)</title><link>https://tomial.github.io/posts/leecode-1-two-sum/</link><pubDate>Tue, 06 Aug 2019 18:03:48 +0000</pubDate><guid>https://tomial.github.io/posts/leecode-1-two-sum/</guid><description><h2 id="题目描述">题目描述：</h2>
<blockquote>
<p>LeetCode第一题，两数之和</p>
<p>Given an array of integers, return <code>indices</code> of the two numbers such that they add up to a specific target.</p>
<p>You may assume that each input would have <code>exactly</code> one solution, and you may not use the same element twice.</p>
</blockquote>
<p><strong>Example:</strong></p>
<blockquote>
<p>Given nums = [2, 7, 11, 15], target = 9,</p>
<p>Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].</p></description></item><item><title>LeetCode-1128-Number of Equivalent Domino Pairs(等价多米诺骨牌对的数量)</title><link>https://tomial.github.io/posts/leetcode-1128-number-of-equivalent-domino-pairs/</link><pubDate>Thu, 01 Aug 2019 23:35:00 +0000</pubDate><guid>https://tomial.github.io/posts/leetcode-1128-number-of-equivalent-domino-pairs/</guid><description><h2 id="题目描述">题目描述：</h2>
<blockquote>
<p>Given a list of <code>dominoes</code>, <code>dominoes[i] = [a, b]</code> is equivalent to <code>dominoes[j] = [c, d]</code> if and only if either<code> (a==c and b==d)</code>, or <code>(a==d and b==c)</code> - that is, one domino can be rotated to be equal to another domino.</p>
<p>Return the number of pairs <code>(i, j) </code>for which <code>0 &lt;= i &lt; j &lt; dominoes.length</code>, and <code>dominoes[i]</code> is equivalent to <code>dominoes[j]</code>.</p>
</blockquote>
<h2 id="example-1"><strong>Example 1:</strong></h2>
<pre tabindex="0"><code>Input: dominoes = [[1,2],[2,1],[3,4],[5,6]]
Output: 1
</code></pre><p><strong>Constraints:</strong></p></description></item><item><title>Java中的二进制</title><link>https://tomial.github.io/posts/java%E4%B8%AD%E7%9A%84%E4%BA%8C%E8%BF%9B%E5%88%B6/</link><pubDate>Wed, 15 May 2019 23:20:33 +0000</pubDate><guid>https://tomial.github.io/posts/java%E4%B8%AD%E7%9A%84%E4%BA%8C%E8%BF%9B%E5%88%B6/</guid><description><p>Java SE 7之后可以使用二进制来定义<code>byte,short,int,long</code>这些整型变量。要使用二进制来表示整形，需要在数字开头带上<code>0b</code>或者<code>0B</code>，如下所示：</p></description></item><item><title>Java8的Lambda表达式与类型检查、推断及限制</title><link>https://tomial.github.io/posts/java8%E7%9A%84lambda%E8%A1%A8%E8%BE%BE%E5%BC%8F%E4%B8%8E%E7%B1%BB%E5%9E%8B%E6%A3%80%E6%9F%A5%E6%8E%A8%E6%96%AD%E5%8F%8A%E9%99%90%E5%88%B6/</link><pubDate>Tue, 23 Apr 2019 22:12:15 +0000</pubDate><guid>https://tomial.github.io/posts/java8%E7%9A%84lambda%E8%A1%A8%E8%BE%BE%E5%BC%8F%E4%B8%8E%E7%B1%BB%E5%9E%8B%E6%A3%80%E6%9F%A5%E6%8E%A8%E6%96%AD%E5%8F%8A%E9%99%90%E5%88%B6/</guid><description><p>为了全面了解Lambda表达式，我们应该知道Lambda的实际类型是什么。</p>
<h2 id="类型检查">类型检查</h2>
<pre><code>Lambda的类型**是从使用Lambda的上下文推断出来的**。上下文(即`接受它传递的方法参数`或`变量`)所需要的类型称为`目标类型`。下面的例子说明了Lambda表达式工作时**类型检查**的过程：
</code></pre>
<div class="highlight"><div style="color:#cdd6f4;background-color:#1e1e2e;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">
<table style="border-spacing:0;padding:0;margin:0;border:0;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
<pre tabindex="0" style="color:#cdd6f4;background-color:#1e1e2e;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f849c">1
</span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f849c">2
</span></code></pre></td>
<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
<pre tabindex="0" style="color:#cdd6f4;background-color:#1e1e2e;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-java" data-lang="java"><span style="display:flex;"><span>List<span style="color:#89dceb;font-weight:bold">&lt;</span>Apple<span style="color:#89dceb;font-weight:bold">&gt;</span> heavierThan150g <span style="color:#89dceb;font-weight:bold">=</span>
</span></span><span style="display:flex;"><span> filter(inventory, (Apple a) <span style="color:#89dceb;font-weight:bold">-&gt;</span> a.<span style="color:#89b4fa">getWeight</span>() <span style="color:#89dceb;font-weight:bold">&gt;</span> 150);
</span></span></code></pre></td></tr></table>
</div>
</div><ol>
<li>
<p>使用Lambda的<strong>上下文所需的目标类型</strong>是什么？</p></description></item><item><title>Iterable和Iterator</title><link>https://tomial.github.io/posts/iterable%E5%92%8Citerator/</link><pubDate>Tue, 09 Apr 2019 22:27:12 +0000</pubDate><guid>https://tomial.github.io/posts/iterable%E5%92%8Citerator/</guid><description><h2 id="iterator和iterable的内部实现">Iterator和Iterable的内部实现</h2>
<p><code>iterator</code>为Java中的迭代器对象，是<strong>能够对List这样的集合进行迭代遍历的底层依赖</strong>。而<code>iterable</code>接口里<code>定义了返回iterator的方法，相当于对iterator的封装，实现了iterable接口的类可以支持for each循环。</code></p></description></item><item><title>Java正则表达式匹配模式及实例</title><link>https://tomial.github.io/posts/java%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E5%8C%B9%E9%85%8D%E6%A8%A1%E5%BC%8F%E5%8F%8A%E5%AE%9E%E4%BE%8B/</link><pubDate>Tue, 09 Apr 2019 01:08:58 +0000</pubDate><guid>https://tomial.github.io/posts/java%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E5%8C%B9%E9%85%8D%E6%A8%A1%E5%BC%8F%E5%8F%8A%E5%AE%9E%E4%BE%8B/</guid><description><table>
<thead>
<tr>
<th style="text-align: center">正则表达式</th>
<th style="text-align: center">匹配</th>
<th style="text-align: center">示例</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: center"><code>x</code></td>
<td style="text-align: center">单个字符</td>
<td style="text-align: center">Java匹配<code>Java</code></td>
</tr>
<tr>
<td style="text-align: center"><code>.</code></td>
<td style="text-align: center">任意单个字符</td>
<td style="text-align: center">Java匹配<code>J..a</code></td>
</tr>
<tr>
<td style="text-align: center">(ab|cd)</td>
<td style="text-align: center">ab或cd</td>
<td style="text-align: center">ten匹配t(en|im)</td>
</tr>
<tr>
<td style="text-align: center"><code>[abc]</code></td>
<td style="text-align: center">a或b或c</td>
<td style="text-align: center">Java匹配<code>J[abc]va</code></td>
</tr>
<tr>
<td style="text-align: center"><code>[^abc]</code></td>
<td style="text-align: center">abc外的字符</td>
<td style="text-align: center">Java匹配<code>J[^efg]va</code></td>
</tr>
<tr>
<td style="text-align: center"><code>[a-z]</code></td>
<td style="text-align: center">a-z的任意字符</td>
<td style="text-align: center">Java匹配<code>[A-Z]av[a-z]</code></td>
</tr>
<tr>
<td style="text-align: center"><code>[^a-z]</code></td>
<td style="text-align: center">除a-z的任意字符</td>
<td style="text-align: center">Java匹配<code>Jav[^b-z]</code></td>
</tr>
<tr>
<td style="text-align: center"><code>[a-e[m-p]]</code></td>
<td style="text-align: center">a到e或m到p</td>
<td style="text-align: center">Java匹配 <code>[A-G[I-M]]av[a-d]</code></td>
</tr>
<tr>
<td style="text-align: center"><code>[a-e&amp;&amp;[c-p]]</code></td>
<td style="text-align: center">a到e与c到p的交集</td>
<td style="text-align: center">Java匹配 <code>[A-P&amp;&amp;[I-M]]av[a-d]</code></td>
</tr>
<tr>
<td style="text-align: center"><code>\d</code></td>
<td style="text-align: center">一个数字</td>
<td style="text-align: center">123 匹配<code>\\d</code></td>
</tr>
<tr>
<td style="text-align: center"><code>\D</code></td>
<td style="text-align: center">一个非数字</td>
<td style="text-align: center">$Java匹配<code>[\\D][\\D]ava</code></td>
</tr>
<tr>
<td style="text-align: center"><code>w</code></td>
<td style="text-align: center">单词字符</td>
<td style="text-align: center">Java1匹配 <code>[\\w]ava[\\w]</code></td>
</tr>
<tr>
<td style="text-align: center"><code>W</code></td>
<td style="text-align: center">非单词字符</td>
<td style="text-align: center">$Java匹配<code>[\\W][\\w]ava</code></td>
</tr>
<tr>
<td style="text-align: center"><code>s</code></td>
<td style="text-align: center">空白字符</td>
<td style="text-align: center">Java 2匹配<code>Java\\s2</code></td>
</tr>
<tr>
<td style="text-align: center"><code>p*</code></td>
<td style="text-align: center">p模式出现0次或任意多次(贪婪匹配)</td>
<td style="text-align: center">aaaaab匹配<code>a*b</code></td>
</tr>
<tr>
<td style="text-align: center"><code>p+</code></td>
<td style="text-align: center">p模式出现1次或任意多次</td>
<td style="text-align: center">a匹配<code>a+b*</code>, able匹配<code>(ab)+.*</code></td>
</tr>
<tr>
<td style="text-align: center"><code>p?</code></td>
<td style="text-align: center">p出现0或1次(非贪婪匹配，尽量少地匹配)</td>
<td style="text-align: center">Java匹配<code>J?Java</code>和<code>J?ava</code></td>
</tr>
<tr>
<td style="text-align: center"><code>p{n}</code></td>
<td style="text-align: center">p正好出现n次</td>
<td style="text-align: center">aaaa匹配<code>a{4}</code></td>
</tr>
<tr>
<td style="text-align: center"><code>p{n,}</code></td>
<td style="text-align: center">p至少出现n次</td>
<td style="text-align: center">aaaa匹配<code>a{1,}</code>,a不匹配<code>a{2,}</code></td>
</tr>
<tr>
<td style="text-align: center"><code>p{n,m}</code></td>
<td style="text-align: center">p出现次数在n到m次之间</td>
<td style="text-align: center">aaaa匹配<code>a{1,9}</code>,abb不匹配<code>a{2,9}bb</code></td>
</tr>
</tbody>
</table>
<ul>
<li>
<p><code>matches(regex:String) : boolean</code> : 如果字符串匹配模式，返回true</p></description></item></channel></rss>