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<a class="has-link-grey -link" href="/categories/一起学java/">一起学java</a>
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5 分钟 读完 (大约 772 个字)
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一起学java之jdk的安装
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<h5 id="Java的历史"><a href="#Java的历史" class="headerlink" title="Java的历史"></a>Java的历史</h5><p>1.1991年,sun公司,”Green”项目,智能家电,JGosling(詹姆斯·高斯林),C++ —> Oak(橡树)起初濒临”倒闭”,internet开始流行 </p>
<p>2.94年,Oak改名java(印度尼西亚爪哇岛,盛产咖啡,咖啡宝贝),开发了HotJava浏览器,95年java正式推出发布</p>
<a id="more"></a>
<p>3.java具有能够跨平台,面向对象等特性,sun又将java设计为可以针对不同应用场景的综合开发平台,使之快速流行 </p>
<p>4.学习了java基本语言特性后,可以学习不同的开发包,进行不同平台的开发 </p>
<ul>
<li>Java SE:桌面应用开发</li>
<li>Java EE:企业级开发</li>
<li>Java ME:移动平台开发(手机等) </li>
<li>J2SE1.1 —-> J2SE1.5 改名 java SE 5.0 </li>
<li>09年,甲骨文收购sun,取得java版权 </li>
<li>如今免费版本止步与第８版 </li>
</ul>
<h5 id="java的优势"><a href="#java的优势" class="headerlink" title="java的优势"></a>java的优势</h5><p>1.面向对象—-使之特别适用用复杂,庞大的应用软件开发 </p>
<p>2.平台无关—-代码不用修改即可应用于不同的平台</p>
<p>3.健壮,安全—-完善的内存管理机制 </p>
<h5 id="开发前准备-安装配置JDK"><a href="#开发前准备-安装配置JDK" class="headerlink" title="开发前准备(安装配置JDK)"></a>开发前准备(安装配置JDK)</h5><p>1.安装jdk</p>
<ul>
<li>首先下载一个jdk,去官网找(注意sun被oracle收购了,应该去oracle的官网) </li>
<li>JDK 全称为Java Development Kit ,即java开发工具包．JRE 全称为Java RunTime Environment ,即java运行时环境 ,JDK中即包含一个JRE </li>
<li>bin目录下存放了运行,编译,调试java程序的必需的各种可执行文件 </li>
<li>lib目录下是java的各种开发类库 </li>
</ul>
<p><img src="/images/GetImage.png" alt></p>
<h5 id="配置环境变量"><a href="#配置环境变量" class="headerlink" title="配置环境变量"></a>配置环境变量</h5><p>1.鼠标右击我的电脑–>属性–>高级系统设置–>环境变量 </p>
<ul>
<li>JAVA_HOME=C:\Program Files\Java\jdk1.7.0_21; </li>
<li>CLASSPATH=.;%JAVA_HOME%\lib;(注意不要忘了代表当前目录的 .; ) </li>
<li>Path=原变量值;%JAVA_HOME%\bin;(注意不要删除以前的值) </li>
<li>命令行输入java和javac命令进行验证</li>
</ul>
<p><img src="/images/run_sysetm.png" alt></p>
<h5 id="java的运行机制-简单"><a href="#java的运行机制-简单" class="headerlink" title="java的运行机制(简单)"></a>java的运行机制(简单)</h5><p> java运行平台,即java虚拟机(java Virtual Machine),不同的平台有不同的JVM,不同的JVM可以运行相同的.class文件<br>这样,java即做到了跨平台,可以”Write once , run anywhere”.<br><img src="/images/java_run.png" alt></p>
<h5 id="HelloWorld"><a href="#HelloWorld" class="headerlink" title="HelloWorld"></a>HelloWorld</h5><p>1.第一个java小程序 </p>
<ul>
<li>使用IDEA,新建一个Hello.java文件</li>
<li>输入以下代码 </li>
</ul>
<p><img src="/images/java_helloword_code.png" alt></p>
<p>2.一些说明 </p>
<ul>
<li>java严格区分大小写,请注意大小写字母 </li>
<li>//单行注释,注释的内容在编译的时候忽略,只是为了自己阅读方便 </li>
<li>关键字class声明了一个类,名称为Hello,public修饰该类为公有,java中要求公有类的名称和文件名必须相同,且一个.java文件中只有一个公有类 </li>
<li>main方法是java程序的入口,程序从这里开始运行 </li>
<li>System.out.println();用于在控制台输出语句,输出后换行,没有末尾的System.out.print();为不换行输出,可以使用\n换行 </li>
<li>执行语句在方法体内,用{}包括,方法在类中,用{}包括 </li>
<li>括号必须成对出现,一行只写一条语句,注意代码的缩进和建筑美 </li>
</ul>
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<li><strong>本文标题：</strong><a href="https://blog.visutech.cn/3105940755.html">一起学java之jdk的安装</a></li>
<li><strong>本文作者：</strong><a href="https://blog.visutech.cn">程振奇 | smallodd</a></li>
<li><strong>本文链接：</strong><a href="https://blog.visutech.cn/3105940755.html">https://blog.visutech.cn/3105940755.html</a></li>
<li><strong>发布时间：</strong>2013-07-01</li>
<li><strong>版权声明：</strong>本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/deed.zh" rel="external nofollow" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明出处！
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