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<!DOCTYPE html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
<title>Alvin</title>
<meta name="author" content="Alvin">
<!-- http://t.co/dKP3o1e -->
<meta name="HandheldFriendly" content="True">
<meta name="MobileOptimized" content="320">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="canonical" href="http://freealvin.github.io">
<link href="/favicon.png" type="image/png" rel="icon">
<link href="/atom.xml" rel="alternate" title="Alvin" type="application/atom+xml">
<script src="/javascripts/libs/jquery/jquery-2.0.3.min.js"></script>
<link href="/assets/bootstrap/dist/css/bootstrap.min.css" rel="stylesheet" type="text/css">
<link href="/assets/bootstrap/dist/css/bootstrap-theme.min.css" rel="stylesheet" type="text/css">
<link href="/stylesheets/screen.css" media="screen, projection" rel="stylesheet" type="text/css">
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-44223318-1']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
</head>
<body >
<div id="wrap">
<header role="banner">
<nav class="navbar navbar-default" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/">Alvin</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li class="active">
<a href="/">Blog</a>
</li>
<li >
<a href="/blog/archives">Archives</a>
</li>
<li >
<a href="/about">About</a>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li>
<a class="subscribe-rss" href="/atom.xml" title="subscribe via RSS">
<span class="visible-xs">RSS</span>
<img class="hidden-xs" src="/images/rss.png" alt="RSS">
</a>
</li>
</ul>
<form class="search navbar-form navbar-right" action="https://www.google.com/search" method="GET">
<input type="hidden" name="q" value="site:freealvin.github.io">
<div class="form-group">
<input class="form-control" type="text" name="q" placeholder="Search">
</div>
</form>
</div>
</div>
</nav>
</header>
<div id="main" class="container">
<div id="content">
<div class="row">
<div class="page-content col-md-9">
<meta itemprop="name" content="Alvin" />
<meta itemprop="description" content="" />
<meta itemprop="url" content="http://freealvin.github.io" />
<div class="blog-index" itemscope itemtype="http://schema.org/Blog">
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<header class="page-header">
<p class="meta text-muted text-uppercase">
<span class="glyphicon glyphicon-calendar"></span> <time datetime="2015-04-13T01:55:00+08:00" data-updated="true" itemprop="datePublished dateCreated">Apr 13<sup>th</sup>, 2015</time>
| <a href="/blog/2015/04/13/javacan-shu-chuan-di/#disqus_thread" itemprop="discussionUrl"
data-disqus-identifier="http://freealvin.github.io/blog/2015/04/13/javacan-shu-chuan-di/">Comments</a>
</p>
<h1 class="entry-title" itemprop="name headline"><a href="/blog/2015/04/13/javacan-shu-chuan-di/" itemprop="url">Java参数传递</a></h1>
</header>
<div class="entry-content clearfix" itemprop="articleBody description"><p>参数传递分为值传递和引用传递，Java是面向对象的编程语言，又是如何传递参数的呢？</p>
</div>
<footer>
<a class="btn btn-default" href="/blog/2015/04/13/javacan-shu-chuan-di/">more →</a>
</footer>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<header class="page-header">
<p class="meta text-muted text-uppercase">
<span class="glyphicon glyphicon-calendar"></span> <time datetime="2015-04-11T08:32:47+08:00" data-updated="true" itemprop="datePublished dateCreated">Apr 11<sup>th</sup>, 2015</time>
| <a href="/blog/2015/04/11/java-lei-de-finalyin-yong-cheng-yuan-shi-li/#disqus_thread" itemprop="discussionUrl"
data-disqus-identifier="http://freealvin.github.io/blog/2015/04/11/java-lei-de-finalyin-yong-cheng-yuan-shi-li/">Comments</a>
</p>
<h1 class="entry-title" itemprop="name headline"><a href="/blog/2015/04/11/java-lei-de-finalyin-yong-cheng-yuan-shi-li/" itemprop="url">Java 类的final引用成员实例</a></h1>
</header>
<div class="entry-content clearfix" itemprop="articleBody description"><p>final修饰符大都用于基本类型，或不可变类的域（如果类中的每个方法都不会改变其对象，这种类就是不可变的类。例如，String类就是一个不可变的类）。对于可变的类使用final修饰符可能会对读者造成混乱。例如，private final Date hiredate；</p>
<p>仅仅意味着存储在hiredate变量中的<em>对象引用</em>在对象构造之后不能被改变，而不意味着hiredate对象是一个常量。任何方法都可以对hiredate引用的对象调用setTime更改器。</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
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</pre></td><td class='code'><pre><code class='java'><span class='line'><span class="kn">package</span> <span class="n">per</span><span class="o">.</span><span class="na">alvin</span><span class="o">.</span><span class="na">demos</span><span class="o">;</span>
</span><span class='line'>
</span><span class='line'><span class="kd">public</span> <span class="kd">class</span> <span class="nc">User</span> <span class="o">{</span>
</span><span class='line'>
</span><span class='line'> <span class="kd">private</span> <span class="n">String</span> <span class="n">name</span><span class="o">;</span>
</span><span class='line'> <span class="kd">private</span> <span class="kt">int</span> <span class="n">age</span><span class="o">;</span>
</span><span class='line'>
</span><span class='line'> <span class="kd">public</span> <span class="nf">User</span><span class="o">(){</span>
</span><span class='line'>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'> <span class="kd">public</span> <span class="nf">User</span><span class="o">(</span><span class="n">String</span> <span class="n">name</span><span class="o">,</span> <span class="kt">int</span> <span class="n">age</span><span class="o">){</span>
</span><span class='line'> <span class="k">this</span><span class="o">.</span><span class="na">name</span> <span class="o">=</span> <span class="n">name</span><span class="o">;</span>
</span><span class='line'> <span class="k">this</span><span class="o">.</span><span class="na">age</span> <span class="o">=</span> <span class="n">age</span><span class="o">;</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'>
</span><span class='line'> <span class="kd">public</span> <span class="n">String</span> <span class="nf">getName</span><span class="o">()</span> <span class="o">{</span>
</span><span class='line'> <span class="k">return</span> <span class="n">name</span><span class="o">;</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'> <span class="kd">public</span> <span class="kt">void</span> <span class="nf">setName</span><span class="o">(</span><span class="n">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
</span><span class='line'> <span class="k">this</span><span class="o">.</span><span class="na">name</span> <span class="o">=</span> <span class="n">name</span><span class="o">;</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'> <span class="kd">public</span> <span class="kt">int</span> <span class="nf">getAge</span><span class="o">()</span> <span class="o">{</span>
</span><span class='line'> <span class="k">return</span> <span class="n">age</span><span class="o">;</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'> <span class="kd">public</span> <span class="kt">void</span> <span class="nf">setAge</span><span class="o">(</span><span class="kt">int</span> <span class="n">age</span><span class="o">)</span> <span class="o">{</span>
</span><span class='line'> <span class="k">this</span><span class="o">.</span><span class="na">age</span> <span class="o">=</span> <span class="n">age</span><span class="o">;</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'><span class="o">}</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
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<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
</pre></td><td class='code'><pre><code class='java'><span class='line'><span class="kn">package</span> <span class="n">per</span><span class="o">.</span><span class="na">alvin</span><span class="o">.</span><span class="na">demos</span><span class="o">;</span>
</span><span class='line'>
</span><span class='line'><span class="kd">public</span> <span class="kd">class</span> <span class="nc">Item</span> <span class="o">{</span>
</span><span class='line'> <span class="kd">private</span> <span class="kd">final</span> <span class="n">User</span> <span class="n">user</span><span class="o">;</span>
</span><span class='line'>
</span><span class='line'> <span class="kd">public</span> <span class="nf">Item</span><span class="o">(</span><span class="n">User</span> <span class="n">user</span><span class="o">){</span>
</span><span class='line'> <span class="k">this</span><span class="o">.</span><span class="na">user</span> <span class="o">=</span> <span class="n">user</span><span class="o">;</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'> <span class="kd">public</span> <span class="n">User</span> <span class="nf">getUser</span><span class="o">()</span> <span class="o">{</span>
</span><span class='line'> <span class="k">return</span> <span class="n">user</span><span class="o">;</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'>
</span><span class='line'> <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span> <span class="o">[]</span> <span class="n">arags</span><span class="o">){</span>
</span><span class='line'> <span class="n">User</span> <span class="n">alvin</span> <span class="o">=</span> <span class="k">new</span> <span class="n">User</span><span class="o">(</span><span class="s">"alvin"</span><span class="o">,</span> <span class="mi">22</span><span class="o">);</span>
</span><span class='line'> <span class="n">Item</span> <span class="n">item</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Item</span><span class="o">(</span><span class="n">alvin</span><span class="o">);</span>
</span><span class='line'>
</span><span class='line'> <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">item</span><span class="o">.</span><span class="na">getUser</span><span class="o">().</span><span class="na">getName</span><span class="o">());</span>
</span><span class='line'> <span class="n">alvin</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"nathan"</span><span class="o">);</span>
</span><span class='line'> <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">item</span><span class="o">.</span><span class="na">getUser</span><span class="o">().</span><span class="na">getName</span><span class="o">());</span>
</span><span class='line'>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'><span class="o">}</span>
</span></code></pre></td></tr></table></div></figure>
<p></p>
</div>
</article>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<header class="page-header">
<p class="meta text-muted text-uppercase">
<span class="glyphicon glyphicon-calendar"></span> <time datetime="2015-04-08T19:30:59+08:00" data-updated="true" itemprop="datePublished dateCreated">Apr 8<sup>th</sup>, 2015</time>
| <a href="/blog/2015/04/08/unixhuan-jing-gao-ji-bian-cheng-zhi-jin-cheng-huan-jing/#disqus_thread" itemprop="discussionUrl"
data-disqus-identifier="http://freealvin.github.io/blog/2015/04/08/unixhuan-jing-gao-ji-bian-cheng-zhi-jin-cheng-huan-jing/">Comments</a>
</p>
<h1 class="entry-title" itemprop="name headline"><a href="/blog/2015/04/08/unixhuan-jing-gao-ji-bian-cheng-zhi-jin-cheng-huan-jing/" itemprop="url">Unix环境高级编程之进程环境</a></h1>
</header>
<div class="entry-content clearfix" itemprop="articleBody description"><p>当执行程序时，main函数是如何被调用的；命令行参数如何传送给程序；典型的存储器布局是什么样的；如何分配额外的存储空间；进程如何使用环境变量；不同进程的终止形式。</p>
<!--more--->
<h2>main函数</h2>
<p>当内核执行C程序时，在调用main前先调用一个特殊的启动例程。可执行文件将词启动例程指定微程序的起始位置——这由连接编辑器设置，而连接编辑器由C编译器调用，启动例程从内核获得命令行参数和环境变量。</p>
<h2>进程终止</h2>
<p>八种方式可以终止进程，5种为正常终止，它们是：
1.从main返回
2.调用exit
3.调用<em>exit或</em>EXIT
4.最后一个线程从其启动例程返回
5.最后一个线程调用pthread_exit</p>
<p>异常的终止方式有三种
6.调用abort
7.接到一个信号并终止
8.最后一个线程对取消请求做出相应</p>
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<span class="glyphicon glyphicon-calendar"></span> <time datetime="2015-04-04T17:08:13+08:00" data-updated="true" itemprop="datePublished dateCreated">Apr 4<sup>th</sup>, 2015</time>
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<h1 class="entry-title" itemprop="name headline"><a href="/blog/2015/04/04/liu-ge-yue-hou/" itemprop="url">六个月后</a></h1>
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<div class="entry-content clearfix" itemprop="articleBody description"><p>六个月后重新找回Octopress开始写作的我，开始知道自己的未来的目标，精通java，阅读Mysql类的书，开始去真正了解分布式系统设计，向我的同学学习，了解机器学习。</p>
<p>我知道现在白天实习，晚上去抽时间学习比较累，但有目标的人心里总是有底的，我相信我能坚持。加油。</p>
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<span class="glyphicon glyphicon-calendar"></span> <time datetime="2013-12-02T21:31:00+08:00" data-updated="true" itemprop="datePublished dateCreated">Dec 2<sup>nd</sup>, 2013</time>
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<h1 class="entry-title" itemprop="name headline"><a href="/blog/2013/12/02/cyu-yan-de-suo-jin-he-kong-bai/" itemprop="url">C语言的缩进和空白</a></h1>
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<div class="entry-content clearfix" itemprop="articleBody description"><p>C语言的缩进和空白使用原则</p>
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<h1 class="entry-title" itemprop="name headline"><a href="/blog/2013/12/02/at-and-thui-bian-yu-fa-2/" itemprop="url">AT&T汇编语法2</a></h1>
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<span class="glyphicon glyphicon-calendar"></span> <time datetime="2013-11-26T20:09:00+08:00" data-updated="true" itemprop="datePublished dateCreated">Nov 26<sup>th</sup>, 2013</time>
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<h1 class="entry-title" itemprop="name headline"><a href="/blog/2013/11/26/linuxzhong-de-zheng-ze-biao-da-shi/" itemprop="url">Linux中的正则表达式</a></h1>
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<div class="entry-content clearfix" itemprop="articleBody description"><!--more about 正则表达式-->
<h1>正则表达式</h1>
<br />
<pre><code>正则表达式完成字符串的匹配搜索，在Unix系统中，sed、grep、vi等工具都是用regexp规则。
(1) 正则表达式的基本语法
| 符号 | 含义 | 举例 | 匹配 |
| --------------- | ---------------------------------------- | -------------------- | -------------------------- |
| . | 任何字符 | a.. | a后面有两个字符的字符串 |
| ? | 修饰匹配次数，0次或1次 | x? | 0个或1个x |
| ^ | 匹配行首 | ^word | 位于行首的word |
| + | 重复一次或多次 | y+ | 一个--或多个连续的y |
| $ | 行尾 | x$ | 以x结尾的行 |
| * | 重复0次或多次 | w.*s | 以w开头、s结尾的任何字符串 |
| [字符表] | 字符表中的任一字符 | [tT] | 小写字母t或大写字母T |
| [!字符表] | 匹配不属于范围指定内的字符 | [!a-z] | 匹配不是小写字母的字符 |
| [^字符表] | 任一不在字符表中的字符 | [^a-z A-Z] | 任何非字母 |
| \ | 转义字符 | \\n | 匹配换行符 |
| \{min,max\} | 前导正则表达式最少重复min次，最多重复max次 | x\{1,5\} | 最少1个最多5个x |
| \(...\) | 将圆括号中匹配的字符串存储到下一个寄存器中 | \(more\)and\1 | 匹配more and more |
| 表达式|1表达式2 | 匹配表达式1或表达式2 | hello| happy | 匹配hello或happy |
</code></pre>
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<h1 class="entry-title" itemprop="name headline"><a href="/blog/2013/11/18/ruby-on-rails-with-mongodb/" itemprop="url">Ruby on Rails With Mongodb</a></h1>
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<span class="glyphicon glyphicon-calendar"></span> <time datetime="2013-10-11T23:25:00+08:00" data-updated="true" itemprop="datePublished dateCreated">Oct 11<sup>th</sup>, 2013</time>
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<h1 class="entry-title" itemprop="name headline"><a href="/blog/2013/10/11/ba-cs50-dot-htian-jia-dao-ku-zhong/" itemprop="url">把cs50.h添加到库中</a></h1>
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<div class="entry-content clearfix" itemprop="articleBody description"><p> 我最近在看网易公开课CS50，自我感觉非常喜欢David J. Malan的教学方法，非常羡慕和感慨哈佛学生的大学学习环境。也感谢网易为广大中国学生带来的福利。</p>
<p> 以下是自己网上搜素总结的如何模仿搭建CS50中Malan使用的开发环境。</p>
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