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程序员必读

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java程序员必读基础篇（168个子文件）

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<html>  <head> <title>|><| 太平洋电脑网 -> 网络学院</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <style type="text/css">  </style> <link rel="stylesheet" href="/pcedu/style/text.css"> <script language="JavaScript">  </script> </head> <body bgcolor="#FFFFFF" topmargin=0 leftmargin=0 marginheight="0" onLoad="MM_preloadImages('/images/lefton.gif','/images/topon.gif')"> <a name="top"></a> <script language="JavaScript" src="/pcedu/script/top.js"> </script> <table width=760 border=0 cellspacing=0 cellpadding=0 align=center> <tr> <td width=194 height="56"><a href=http://www.pconline.com.cn><img src=http://www.pconline.com.cn/images/pconlinelogo.gif width=162 height=35 vspace=10 border=0></a></td> <td width=406 height="56"> <script language="JavaScript" src="/pcedu/script/empolder_ad.js"> </script> </td> <td width=158 align=right height="56"> <script language="JavaScript" src="/pcedu/script/empolder_ad1.js"> </script> </td> <td align=right width=2 height="56"> </td> </tr> </table> <table border=0 cellpadding=0 cellspacing=0 width=760 align="center"> <tbody> <tr valign=bottom> <td rowspan=2 width=172><img height=32 src="/pcedu/images/pcedu_lo.gif" width=172 border="0"></td> <td height=30 rowspan=2> <table cellpadding=0 cellspacing=0 width="588" bgcolor="#FFA000" background="/pcedu/images/e_menu5.gif" border="0"> <tbody> <tr valign="bottom"> <td height="17"> <script language="JavaScript" src="/pcedu/script/title_empolder.js"> </script> </td> </tr> </tbody> </table> </td> </tr> <tr></tr> <tr bgcolor="#303880"> <td colspan=2 height=1 valign=bottom><img height=1 src="/pcedu/images/blank.gif" width=1></td> </tr> <tr> <td colspan=2 height=5 valign=bottom><img height=5 src="/pcedu/images/blank.gif" width=1></td> </tr> </tbody> </table> <table width="760" cellspacing="0" cellpadding="0" align="center" height="614"> <tr> <td width="170" height="616" valign="top" rowspan="2"> <table border="0" width="170" height="100%" cellspacing="1" bgcolor="#000000"> <tr bgcolor="#F8F8D2"> <td width="100%" valign="top" height="307"> <script language="JavaScript" src="/pcedu/script/left_empolder.js"> </script> </td> </tr> </table> </td> <td width="8" height="308"><img src="/pcedu/images/blank.gif" width="1" height="1"></td> <td valign="top" height="444" width="582"> <table width="582" border="0" cellspacing="0" cellpadding="0" height="1" background="/images/line5.gif"> <tr> <td height="1"></td> </tr> </table>  <table width="582" border="0" cellspacing="8" cellpadding="0" background="/images/bg6.gif"> <tr> <td valign="top"> <table width="100%" border="0" cellspacing="8" cellpadding="0" background="/images/point.gif"> <tr> <td height="4" colspan="3"></td> </tr> <tr> <td height="22" colspan="3"> <div align="center" class="title">JAVA程序员必读：基础篇（3）语言基础</div> </td> </tr> <tr valign="bottom"> <td width="90" height="18"> <div align="right" class="gray">    </div> <div class="gray"></div> </td> <td height="18"> <div align="center"><font color="#666666">编译：ZSC/太平洋网络学院</font></div> </td> <td width="90"> <div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［责编:爆破手］</a></div> </td> </tr> <tr valign="bottom"> <td colspan="3" height="0"></td> </tr> </table> <p class="article"> <b>语言基础</b> </p> <p></p> <p class="article"><b>3.1.1 数据类型</b></p> <p class="article"> 　　每一个变量必须有一个数据类型。一个变量的数据类型决定了变量能容纳的数值和操作符。比如，在MaxVariablesDemo程序中，声明int largestInteger决定了largestInteger是一个整型数据类型（int）。整型只能容纳整型数（可以是正数也可以是负数）。你可以完成算术操作，比如，整型变量的加法等等。</p> <p class="article"> 　　JAVA程序语言有两类的数据类型：原始和引用。一个原始类型的变量为它的类型包含了适当大小和格式的单一数值：一个数字、字符或者一个布尔型数值。比如，一个整型数值是一个32位数据。</p> <p class="article"> 　　下面表格所有的JAVA支持的所有原始数据类型，还给出了它们的大小和格式以及简短的描述。MaxVariablesDemo程序为每一个原始类型声明了一个变量：</p> <p> </p> <table BORDER cellspacing=1 cellpadding=7 width=98% align="center"> <tr> <td width="33%" valign="TOP"> <p align="CENTER" class="article">关键字 </td> <td width="33%" valign="TOP"> <p align="CENTER" class="article">描述 </td> <td width="33%" valign="TOP"> <p align="CENTER" class="article">大小/格式 </td> </tr> <tr> <td valign="TOP" colspan=3> <p align="CENTER" class="article">整型 </td> </tr> <tr> <td width="33%" valign="TOP"> <p align="CENTER" class="article">byte </td> <td width="33%" valign="TOP"> <p align="CENTER" class="article">字节长度整型 </td> <td width="33%" valign="TOP"> <p align="CENTER" class="article">8位两个补码 </td> </tr> <tr> <td width="33%" valign="TOP"> <p align="CENTER" class="article">Short </td> <td width="33%" valign="TOP"> <p align="CENTER" class="article">短整型 </td> <td width="33%" valign="TOP"> <p align="CENTER" class="article">16位两个补码 </td> </tr> <tr> <td width="33%" valign="TOP"> <p align="CENTER" class="article">int </td> <td width="33%" valign="TOP"> <p align="CENTER" class="article">整型 </td> <td width="33%" valign="TOP"> <p align="CENTER" class="article">32位两个补码 </td> </tr> <tr> <td width="33%" valign="TOP"> <p align="CENTER" class="article">long </td> <td width="33%" valign="TOP"> <p align="CENTER" class="articl

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