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<div align="center" class="title">JAVA程序員必讀：基礎篇（3）語言基礎</div>
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<div align="center"><font color="#666666">編譯：ZSC/太平洋網絡學院</font></div>
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<div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［責編:爆破手］</a></div>
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<p class="article"> <b>語言基礎</b> </p>
<p> </p>
<p><b><span class="article">3.1.5 </span></b><span class="article"><b>變量的總結</b></span></p>
<p class="article"> 當你聲明了一個變量，你就顯性地設置了變量的名字和數據類型。JAVA編程語言右兩類的數據類型：原始和引用。原始數據的變量包含一個數值。以下這張表顯示了所有的原始數據類型以及它們的大小和格式。</p>
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<p align="CENTER" class="article">關鍵字
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<p align="CENTER" class="article">描述
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<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">字節長度整型
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<p align="CENTER" class="article">8位兩個補碼
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<p align="CENTER" class="article">Short
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<p align="CENTER" class="article">短整型
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<p align="CENTER" class="article">16位兩個補碼
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<p align="CENTER" class="article">int
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<p align="CENTER" class="article">整型
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<p align="CENTER" class="article">32位兩個補碼
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<p align="CENTER" class="article">long
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<p align="CENTER" class="article">長整型
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<p align="CENTER" class="article">64位兩個補碼
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<p align="CENTER" class="article">實數
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<p align="CENTER" class="article">Float
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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">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"> 變量聲明的位置隱含地設置了變量的作用域，它決定了代碼的哪一部分可以通過變量名來調用這個變量。具體有以下四種類型的作用域：成員變量作用域、本地變量作用域、參數作用域以及異常處理參數作用域。</p>
<p class="article"> 你可以使用賦值操作符（=）來在聲明的地方對變量進行初始化。</p>
<p class="article"> 你也可以將變量聲明為final。Final變量的數值在初始化之后不能再被改變。</p>
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