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<div align="center" class="title">JAVA程序员必读：基础篇（3）语言基础</div>
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<div align="center"><font color="#666666">编译：ZSC/太平洋网络学院</font></div>
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<div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［责编:爆破手］</a></div>
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<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>
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<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
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<p align="CENTER" class="article">整型
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<p align="CENTER" class="article">byte
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<p align="CENTER" class="article">字节长度整型
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<td width="33%" valign="TOP">
<p align="CENTER" class="article">8位两个补码
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<p align="CENTER" class="article">Short
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<td width="33%" valign="TOP">
<p align="CENTER" class="article">短整型
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<td width="33%" valign="TOP">
<p align="CENTER" class="article">16位两个补码
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<p align="CENTER" class="article">int
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<td width="33%" valign="TOP">
<p align="CENTER" class="article">整型
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<td width="33%" valign="TOP">
<p align="CENTER" class="article">32位两个补码
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<td width="33%" valign="TOP">
<p align="CENTER" class="article">long
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<td width="33%" valign="TOP">
<p align="CENTER" class="articl
JAVA程序员必读：基础篇
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2008-06-17
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