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<p align="CENTER" class="article">单精度浮点型
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<p align="CENTER" class="article">32位IEEE 754
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<p align="CENTER" class="article">Double
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<p align="CENTER" class="article">双精度浮点型
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<p align="CENTER" class="article">64位IEEE 754
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<p align="CENTER" class="article">其它类型
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<p align="CENTER" class="article">Char
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<p align="CENTER" class="article">单个字符
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<p align="CENTER" class="article">16位Unicode字符
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<p align="CENTER" class="article">boolean
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<p align="CENTER" class="article">布尔型数值（true或者false）
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<p align="CENTER" class="article">真或假
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<p class="article"> 在其它语言中，原始类型数据的格式和大小可能依靠于程序运行的平台。相比之下，Java程序语言可以指定原始数据类型的大小和格式。因此，你不必担心系统从属问题。</p>
<p class="article"> 你可以在你的代码中直接为原始变量设置数值。比如，如果你需要为一个整型变量设置为4，你可以编写以下代码：
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<p class="article">int anInt = 4;</p>
<p class="article"> 数字4就是一个整型数值。下面是各种原始数值举例：</p>
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<p align="CENTER" class="article">数值
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<p align="CENTER" class="article">类型
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<p align="CENTER" class="article">178
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<p align="CENTER" class="article">Int
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<p align="CENTER" class="article">Long
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<p align="CENTER" class="article">Double
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<p align="CENTER" class="article">37.266D
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<p align="CENTER" class="article">87.363F
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<p align="CENTER" class="article">26.77e3
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<p align="CENTER" class="article">' c '
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<p align="CENTER" class="article">char
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<p align="CENTER" class="article">true
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<p align="CENTER" class="article">boolean
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<p align="CENTER" class="article">false
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<p align="CENTER" class="article">boolean
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<p></p>
<p class="article"> 总得说来，没有小数点的数就是整型。你可以通过在数字后面加一个'L' 或者'l'指定为一个长整型。一般使用'L'而不使用'l'，因为'l'很容易与数字'1'混起来。有小数点的数为双精度类型。你可以在数字后面放置'f'
或者 'F'来指定为实数。而字符型数值可以是处在单引号中间的任何单一的Unicode字符；两个布尔型数是true和false。</p>
<p class="article"> 数组、类以及接口是引用的类型。引用类型变量的数值跟原始类型的数值比较起来，它是数值的一个引用或者是由变量代表的数值。</p>
<p class="article"> 一个引用称为一个指针或者在其它语言中称为内存地址。JAVA编程语言象其它语言一样不支持地址的详细使用，你可以使用变量的名字来取代。</p>
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