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</script><link rel="alternate" type="application/atom+xml" href="/atom.xml"></head><body><div class="body_container"><div id="header"><div class="site-name"><h1 class="hidden">1.了解java</h1><a id="logo" href="/.">ZJ_BLOG</a><p class="description">Silence的博客</p></div><div id="nav-menu"><a class="current" href="/."><i class="fa fa-home"> 首页</i></a><a href="/archives/"><i class="fa fa-archive"> 归档</i></a></div></div><div class="pure-g" id="layout"><div class="pure-u-1 pure-u-md-3-4"><div class="content_container"><div class="post"><h1 class="post-title">1.了解java</h1><div class="post-meta">Feb 5, 2017<span> | </span><span class="category"><a href="/categories/java虚拟机/">java虚拟机</a></span></div><div class="post-content"><p>来自<<深入了解java虚拟机>>:</p>
<h2 id="Java不仅是一门编程语言-也是一个由一系列计算机软件和规范形成的技术体系"><a href="#Java不仅是一门编程语言-也是一个由一系列计算机软件和规范形成的技术体系" class="headerlink" title="Java不仅是一门编程语言, 也是一个由一系列计算机软件和规范形成的技术体系"></a>Java不仅是一门编程语言, 也是一个由一系列计算机软件和规范形成的技术体系</h2><hr>
<h5 id="java技术体系包括"><a href="#java技术体系包括" class="headerlink" title="java技术体系包括"></a><strong>java技术体系包括</strong></h5><h5 id="这是sun公司定义的"><a href="#这是sun公司定义的" class="headerlink" title="(这是sun公司定义的)"></a>(这是sun公司定义的)</h5><blockquote>
<ol>
<li>Java程序设计语言</li>
<li>各种硬件平台上的java虚拟机</li>
<li>Java API类库</li>
<li>Class文件</li>
<li>各种第三方Java类库</li>
</ol>
</blockquote>
<blockquote>
<p>其中前三部分共同统称——>JDK (Java Development Kit) 这是支持Java程序开发的最小环境<em><br>JavaAPI类库中的JavaSE API子集和Java虚拟机统称——>JRE (Java Runtime Environment) 这是支持Java程序运行的标准环境</em><br><img src="http://img.blog.csdn.net/20161214190258788?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvYW55YW8xMTIyMzM=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="这里写图片描述"></p>
</blockquote>
<a id="more"></a>
<pre><code>*(这是原书上的附图)*
</code></pre><hr>
<h2 id="java技术体系按照业务领域目前分为4个平台"><a href="#java技术体系按照业务领域目前分为4个平台" class="headerlink" title="*java技术体系按照业务领域目前分为4个平台**"></a>*java技术体系按照业务领域目前分为4个平台**</h2><blockquote>
<ol>
<li>Java Card ——> 支持Java小程序(Applets) 运行在小内存设备(智能卡)上的平台</li>
<li>Java ME (Micro Edition) —–> 支持Java程序运行在移动终端(手机, PDA)上的平台, 也称为J2ME</li>
<li>Java SE (Standard Edition) –> 支持面向桌面的级应用(如windows下的应用程序)的Java平台 提供了完整的Java核心API, 也称为J2SE</li>
<li>Java EE (Enterprise Edition) –> 支持使用多层架构的企业应用的Java平台, 提供了JavaSE API以及其它扩充,也称为J2EE .</li>
</ol>
</blockquote>
<hr>
<h4 id="Java发展史"><a href="#Java发展史" class="headerlink" title="*Java发展史**"></a>*Java发展史**</h4><p><img src="http://img.blog.csdn.net/20161214192716089?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvYW55YW8xMTIyMzM=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="这里写图片描述"></p>
<p><strong>其他大事</strong></p>
<ul>
<li>1999年4月,HotSpot虚拟机发布 (其原虚拟机研发公司于1997年被sun公司收购),JDK1.3以后成为所有SunJDK的默认虚拟机</li>
<li>JDK1.5以前版本语法变化较小,发布的1.5的语法层面进行了巨大改进,包括自动装箱,泛型,动态注解,foreach等,并改进了java内存模型</li>
<li>JDK1.6以后就不叫J2ME,J2SE,J2EE而改名为Java ME6, Java SE6, Java EE6</li>
<li>2006年在JavaOne大会上 Sun公司将Java陆续开源</li>
<li>2009年Sun公司被Oracle收购 (但Java语言由JCP组织管理)</li>
<li></li>
</ul>
<hr>
<h3 id="Java虚拟机发展史-部分"><a href="#Java虚拟机发展史-部分" class="headerlink" title="*Java虚拟机发展史(部分)**"></a>*Java虚拟机发展史(部分)**</h3><p>虚拟机版本有</p>
<ol>
<li>Sun Classic VM –>世界上第一个商用虚拟机 (JDK1.0的运行环境)</li>
<li>Sun HotSpot VM –>目前使用范围最广的Java虚拟机 ,Sun JDK,Open JDK所带的虚拟机 :: (#当初设计 的目标是达到C语言50%以上的执行效率)</li>
<li>KVM (Sun公司) –>简单,轻量,高度可移植,运行速度慢.广泛运用于Android,iOS等智能手机系统</li>
<li>JRockit VM (BEA公司) –>专注服务器应用的虚拟机,所以可以不关注启动速度而运行速度快,其在垃圾回收器和MissionControl服务套件等部分的实现处于领先地位</li>
<li>IBM J9 VM (IBM公司) –> 一款多用途虚拟机</li>
<li>Microsoft JVM(微软) –> 这是可以说是最有意思的……当初微软也是Java技术的铁杆支持者,并且自行开发了只有win平台的java虚拟机,然而Sun公司起诉微软侵权,微软败诉于是被迫终止了Java虚拟机的研究,移除了WindowsXP中自家Java虚拟机．有趣的是当初怼人家时候说人侵权要阻止人家支持Java,真的成了之后Sun公司又到处登报纸希望Windows继续支持Java,因为那时候Sun真的是已经日薄西山了 (讽刺啊!!)</li>
</ol>
<hr>
<h4 id="OpenJDK源码仓库地址"><a href="#OpenJDK源码仓库地址" class="headerlink" title="OpenJDK源码仓库地址*"></a><strong>OpenJDK源码仓库地址*</strong></h4><p><a href="http://hg.openjdk.java.net/jdk7u/jdk7u-dev" target="_blank" rel="noopener">http://hg.openjdk.java.net/jdk7u/jdk7u-dev</a></p>
<h4 id="OpenJDK官方源码包"><a href="#OpenJDK官方源码包" class="headerlink" title="OpenJDK官方源码包"></a><strong>OpenJDK官方源码包</strong></h4><p><a href="http://jdk7.java.net/source.html" target="_blank" rel="noopener">http://jdk7.java.net/source.html</a></p>
<p><em>ps:尽量在linux或者mac上构建OpenJDK</em></p>
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