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<h1 class="entry-title"><a href="/blog/2013/06/18/java8-preview-lambda-expression/">Java 8 预览之Lambda表达式</a></h1>
<p class="meta">
<time class='entry-date' datetime='2013-06-18T00:00:00+08:00'><span class='date'><span class='date-month'>Jun</span> <span class='date-day'>18</span><span class='date-suffix'>th</span>, <span class='date-year'>2013</span></span> <span class='time'>12:00 am</span></time>
| <a href="/blog/2013/06/18/java8-preview-lambda-expression/#disqus_thread"
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</header>
<div class="entry-content"><p>我在和别人结对写C#代码的时候，只要有可能，我都会用list的forEach方法写循环，而不是用for-loop。同伴很不解，我打趣地说：“这完全是一个Java程序员的恶趣味，因为在Java的世界里没有Lambda”。说实话，我非常喜欢Lambda表达式，它简洁、明确、非常优雅。幸运的是，经历了Java 7的跳票之后，Java 8终于很有诚意的包含Lambda了。</p>
<p><a href="http://en.wikipedia.org/wiki/Lambda_expression">Lambda表达式</a>其实就是匿名函数，它可以作为参数传递给<a href="http://en.wikipedia.org/wiki/Higher-order_function">高阶函数</a>供其调用。</p>
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<h1 class="entry-title"><a href="/blog/2013/06/15/java8-preview-method-reference/">Java 8 预览之Method Reference</a></h1>
<p class="meta">
<time class='entry-date' datetime='2013-06-15T00:00:00+08:00'><span class='date'><span class='date-month'>Jun</span> <span class='date-day'>15</span><span class='date-suffix'>th</span>, <span class='date-year'>2013</span></span> <span class='time'>12:00 am</span></time>
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</header>
<div class="entry-content"><p>先看一个Lambda表达式的例子：</p>
<div class="highlight"><pre><code class="language-java" data-lang="java"><span class="n">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="s">"Windows"</span><span class="o">,</span> <span class="s">"Mac OSX"</span><span class="o">).</span><span class="na">forEach</span><span class="o">(</span><span class="n">x</span> <span class="o">-></span> <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">x</span><span class="o">));</span></code></pre></div>
<p>既然Lambda表达式<code>x->System.out.println(x)</code>相当于匿名函数（接受一个String类型的参数，无返回值），那么对于其使用者<code>forEach</code>而言，传给它一个匿名函数还是有名字的函数其实没有区别，只要这个函数满足<code>forEach</code>的参数规约即可。而且很多时候有名字的函数反而可读性更好并且更利于代码重用。如此说来，Java 8 引入方法引用（Method Reference）也就顺理成章了。上面的代码用方法引用可以写成：</p>
<div class="highlight"><pre><code class="language-java" data-lang="java"><span class="n">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="s">"Windows"</span><span class="o">,</span> <span class="s">"Mac OSX"</span><span class="o">).</span><span class="na">forEach</span><span class="o">(</span><span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">::</span><span class="n">println</span><span class="o">);</span></code></pre></div>
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<h1 class="entry-title"><a href="/blog/2013/06/15/java8-preview-functional-interface/">Java 8 预览之Functional Interface</a></h1>
<p class="meta">
<time class='entry-date' datetime='2013-06-15T00:00:00+08:00'><span class='date'><span class='date-month'>Jun</span> <span class='date-day'>15</span><span class='date-suffix'>th</span>, <span class='date-year'>2013</span></span> <span class='time'>12:00 am</span></time>
| <a href="/blog/2013/06/15/java8-preview-functional-interface/#disqus_thread"
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<div class="entry-content"><p>在JDK的类库中，有很多只声明了一个方法的接口，比如<code>java.lang.Iterable<T></code>和<code>java.lang.Runnable</code>。这些接口被称为单抽象方法接口（Single Abstract Method interfaces），它表达了一种逻辑上的单一功能约定。</p>
<p>Java 8为这样的接口引入了一个新概念——函数式接口（<strong>Functional Interface</strong>），同时引入注解<code>@FunctionalInterface</code>以帮助编译器检查函数式接口的合法性。</p>
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<h1 class="entry-title"><a href="/blog/2013/06/13/java8previewdefaultmethod/">Java 8 预览之Default Method</a></h1>
<p class="meta">
<time class='entry-date' datetime='2013-06-13T00:00:00+08:00'><span class='date'><span class='date-month'>Jun</span> <span class='date-day'>13</span><span class='date-suffix'>th</span>, <span class='date-year'>2013</span></span> <span class='time'>12:00 am</span></time>
| <a href="/blog/2013/06/13/java8previewdefaultmethod/#disqus_thread"
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<div class="entry-content"><p>打开JDK 8的源代码，你会发现很多接口中多了一些标记为<strong>default</strong>的方法。在Java的早期版本中，<strong>default</strong>关键字只在switch语句中使用，在方法上使用代表什么含义呢？让我们一起来看一下Java 8新特性：<strong>Default Method</strong>。</p>
<h3>何为Default Method</h3>
<p>默认方法（Default Method），又称虚拟扩展方法（Virtual Extension Methods）或保卫者方法（Defender Method），是<a href="http://www.jcp.org/en/jsr/detail?id=335">JSR 335</a>的一部分。让我们先看一下JDK中的实际例子：</p>
<div class="highlight"><pre><code class="language-java" data-lang="java"><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">Iterable</span><span class="o"><</span><span class="n">T</span><span class="o">></span> <span class="o">{</span>
<span class="n">Iterator</span><span class="o"><</span><span class="n">T</span><span class="o">></span> <span class="nf">iterator</span><span class="o">();</span>
<span class="k">default</span> <span class="kt">void</span> <span class="nf">forEach</span><span class="o">(</span><span class="n">Consumer</span><span class="o"><?</span> <span class="kd">super</span> <span class="n">T</span><span class="o">></span> <span class="n">action</span><span class="o">)</span> <span class="o">{</span>
<span class="n">Objects</span><span class="o">.</span><span class="na">requireNonNull</span><span class="o">(</span><span class="n">action</span><span class="o">);</span>
<span class="k">for</span> <span class="o">(</span><span class="n">T</span> <span class="n">t</span> <span class="o">:</span> <span class="k">this</span><span class="o">)</span> <span class="o">{</span>
<span class="n">action</span><span class="o">.</span><span class="na">accept</span><span class="o">(</span><span class="n">t</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span></code></pre></div>
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<h1 class="entry-title"><a href="/blog/2013/06/13/intellij-java8-compile-require-target-1-8/">IntelliJ中Java8编译错误-‘source Release 8 Requires Target Release 1.8’</a></h1>
<p class="meta">
<time class='entry-date' datetime='2013-06-13T00:00:00+08:00'><span class='date'><span class='date-month'>Jun</span> <span class='date-day'>13</span><span class='date-suffix'>th</span>, <span class='date-year'>2013</span></span> <span class='time'>12:00 am</span></time>
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<div class="entry-content"><p>在IntelliJ的Java8项目中，尽管已经将Project SDK和Project Launguage Level设置为Java 8，编译测试时仍然会出现编译错误：</p>
<blockquote><p>java: javacTask: source release 8 requires target release 1.8
这里列出了两种解决方案…</p></blockquote>
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<h1 class="entry-title"><a href="/blog/2013/04/28/test-pyramid/">测试金字塔（Test Pyramid）</a></h1>
<p class="meta">
<time class='entry-date' datetime='2013-04-28T00:00:00+08:00'><span class='date'><span class='date-month'>Apr</span> <span class='date-day'>28</span><span class='date-suffix'>th</span>, <span class='date-year'>2013</span></span> <span class='time'>12:00 am</span></time>
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</header>
<div class="entry-content"><p>本文翻译自Martin Fowler的著名文章‘Test Pyramid’，详细论述了敏捷测试中的金字塔结构。</p>
<ul>
<li>原文： <a href="http://martinfowler.com/bliki/TestPyramid.html">Test Pyramid</a></li>
<li>作者： <a href="http://martinfowler.com/">Martin Fowler</a></li>
</ul>
<hr />
<p>测试金字塔概念由<a href="http://www.mountaingoatsoftware.com/">Mike Cohn</a>提出，并在其著作<a href="http://www.amazon.com/gp/product/0321579364?ie=UTF8&tag=martinfowlerc-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0321579364">《Succeeding with Agile》</a><a href="#MyAnnotation1"><sup>译注1</sup></a>中做了详细论述。其核心观点是底层单元测试应多于依赖GUI的高层端到端测试。</p>
<p><img src="/assets/image/posts/TestPyramid.jpeg" alt="Test Pyramid" /></p>
<p>在我职业生涯的大部分时间中，测试自动化就是使用自动化测试工具在用户界面上操控应用程序。这些工具一般都提供录制和回放的功能，并验证应用程序返回了同样的结果。开始时，这种方式工作得很好。测试也很容易录制，即使没有程序设计经验，也可以轻松完成。</p>
<p>但是，这种方法很快就陷入了困境，演变成所谓的<a href="http://watirmelon.com/2012/01/31/introducing-the-software-testing-ice-cream-cone/">蛋卷冰淇淋</a>。主要问题包括：基于UI的测试运行缓慢，增加了构建时间；测试自动化工具往往还需安装授权许可，这意味着这些软件只能在特定的机器上运行；通常这些测试还很难以“傻瓜”模式运行，即通过脚本执行并置入合适的部署流水线（deployment pipeline）。</p>
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<h1 class="entry-title"><a href="/blog/2013/02/08/z-team-2012-popular-words/">Z Team 2012年度热门词汇</a></h1>
<p class="meta">
<time class='entry-date' datetime='2013-02-08T00:00:00+08:00'><span class='date'><span class='date-month'>Feb</span> <span class='date-day'>8</span><span class='date-suffix'>th</span>, <span class='date-year'>2013</span></span> <span class='time'>12:00 am</span></time>
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</header>
<div class="entry-content"><p>2013年2月7日，农历腊月廿七。在这辞旧迎新的美好时刻，Z Team 2012年度总结大会在北京隆重召开。参会的有Z Team的阿宝，晨仔，KK, 少年，xiaoyun； Z Team毕业生代表yuheng，张胖纸，风吹PP凉，以及友邻代表王胖纸。各界人士在热烈友好的气氛中就共同关心的问题深入交换意见，达成广泛共识。最后，与会各方一致评选出2012年度十大热门词汇，排名不分先后（据说只有Z Team的人才能看懂）：</p>
<ul>
<li><strong>这不重要</strong></li>
<li><strong>你说什么</strong></li>
<li><strong>API（A读三声）</strong></li>
<li><strong>反省</strong></li>
<li><strong>我错了</strong></li>
<li><strong>转一个</strong></li>
<li><strong>成功了</strong></li>
<li><strong>你是最棒的</strong></li>
<li><strong>弱爆了</strong></li>
<li><strong>你是对的</strong></li>
</ul>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/01/28/z-team-memorise/">缅怀Z Team</a></h1>
<p class="meta">
<time class='entry-date' datetime='2013-01-28T00:00:00+08:00'><span class='date'><span class='date-month'>Jan</span> <span class='date-day'>28</span><span class='date-suffix'>th</span>, <span class='date-year'>2013</span></span> <span class='time'>12:00 am</span></time>
| <a href="/blog/2013/01/28/z-team-memorise/#disqus_thread"
data-disqus-identifier="http://zyzhang.github.io/blog/2013/01/28/z-team-memorise/">Comments</a>
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<p><img src="/assets/image/posts/z_team.png" alt="z_team" /></p>
<p>Z Team从前年几个人到LA做Inception，到巅峰时期两个Stream近二十人的团队，再到现在算上在美国的大哥一共六个人。就像人的一生，从出生后蹒跚学步咿呀学语，到少年时充满梦想挥洒青春，最后垂垂老矣闲时缅怀旧日时光。我们都知道，总有一天，Z Team会最终消失，但我相信，那些我们共同度过的时光，会在每个人心里慢慢发酵成美好的回忆。下面的歌词改编自《同桌的你》，缅怀那些我们共同拥有的欢笑和泪水。</p>
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<header>
<h1 class="entry-title"><a href="/blog/2012/09/10/avoid-dependency-of-github-pages-jekyll/">避免依赖Github Pages和Jekyll生成静态文件</a></h1>
<p class="meta">
<time class='entry-date' datetime='2012-09-10T00:00:00+08:00'><span class='date'><span class='date-month'>Sep</span> <span class='date-day'>10</span><span class='date-suffix'>th</span>, <span class='date-year'>2012</span></span> <span class='time'>12:00 am</span></time>
| <a href="/blog/2012/09/10/avoid-dependency-of-github-pages-jekyll/#disqus_thread"
data-disqus-identifier="http://zyzhang.github.io/blog/2012/09/10/avoid-dependency-of-github-pages-jekyll/">Comments</a>
</p>
</header>
<div class="entry-content"><p>之前用Github Pages + Jekyll搭建了自己的博客，有一次玩Jekyll插件之后，博客里所有使用Pygments的代码高亮都不工作了，
即使revert代码也无济于事，更奇怪的是，本地运行jekyll完全没问题，折腾很久都没有解决… 最后，我只好采取了终极解决方案了。</p>
<p><a href="https://help.github.com/articles/using-jekyll-with-pages">Github Pages的文档</a>上说，当前（2012年9月）使用的是
Jekyll 0.11.0和Liquid 2.2.2，并且使用下面命令运行：</p>
<div class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="nv">$ </span>jekyll --pygments --no-lsi --safe</code></pre></div>
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<header>
<h1 class="entry-title"><a href="/blog/2012/09/03/blog-with-github-pages-and-jekyll-seo/">Github Pages + Jekyll搭建博客之SEO</a></h1>
<p class="meta">
<time class='entry-date' datetime='2012-09-03T00:00:00+08:00'><span class='date'><span class='date-month'>Sep</span> <span class='date-day'>3</span><span class='date-suffix'>rd</span>, <span class='date-year'>2012</span></span> <span class='time'>12:00 am</span></time>
| <a href="/blog/2012/09/03/blog-with-github-pages-and-jekyll-seo/#disqus_thread"
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</p>
</header>
<div class="entry-content"><p>对我自己的博客而言，有些内容仅仅是自娱自乐，有没有人看不重要；而有的内容我希望能分享出去被更多的人看到，比如nHibernate Mapping By Code的一系列文章，
都是项目中实际总结出来的，那时候nHibernate刚刚增加Mapping By Code的方式，官方文档内容几乎没有，google搜索很少能找到精确的结果。所以，如果这些文章能
被更广泛的传播会帮助更多的人。</p>
<p>在用<a href="http://pages.github.com">Github Pages</a> + <a href="http://jekyllrb.com">Jekyll</a>搭建博客的过程中，
学到了不少<a href="http://en.wikipedia.org/wiki/Search_engine_optimization">SEO（Search Engine Optimization）</a>
的知识，比如如何让博客被搜索引擎收录，需要注意哪些以提高排名等等。于是，便有了下面几条简单的总结。</p>
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