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<p align="CENTER" class="article">單精度浮點型
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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">雙精度浮點型
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<p align="CENTER" class="article">64位IEEE 754
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<p align="CENTER" class="article">其它類型
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<p align="CENTER" class="article">Char
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<p align="CENTER" class="article">單個字符
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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">布爾型數值（true或者false）
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<p align="CENTER" class="article">真或假
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<p class="article"> 在其它語言中，原始類型數據的格式和大小可能依靠于程序運行的平臺。相比之下，Java程序語言可以指定原始數據類型的大小和格式。因此，你不必擔心系統從屬問題。</p>
<p class="article"> 你可以在你的代碼中直接為原始變量設置數值。比如，如果你需要為一個整型變量設置為4，你可以編寫以下代碼：
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<p class="article">int anInt = 4;</p>
<p class="article"> 數字4就是一個整型數值。下面是各種原始數值舉例：</p>
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<p align="CENTER" class="article">類型
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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">Double
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<p align="CENTER" class="article">37.266D
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<p align="CENTER" class="article">' c '
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<p align="CENTER" class="article">true
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<p align="CENTER" class="article">false
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<p class="article"> 總得說來，沒有小數點的數就是整型。你可以通過在數字后面加一個'L' 或者'l'指定為一個長整型。一般使用'L'而不使用'l'，因為'l'很容易與數字'1'混起來。有小數點的數為雙精度類型。你可以在數字后面放置'f'
或者 'F'來指定為實數。而字符型數值可以是處在單引號中間的任何單一的Unicode字符；兩個布爾型數是true和false。</p>
<p class="article"> 數組、類以及接口是引用的類型。引用類型變量的數值跟原始類型的數值比較起來，它是數值的一個引用或者是由變量代表的數值。</p>
<p class="article"> 一個引用稱為一個指針或者在其它語言中稱為內存地址。JAVA編程語言象其它語言一樣不支持地址的詳細使用，你可以使用變量的名字來取代。</p>
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