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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 class="article"><b>3.1.5 final變量</b></p>
<p class="article"> 你可以在任何作用域聲明一個變量。Final變量的數值不能在初始化之后進行改變。這樣的變量跟其它語言中的常量很相似。</p>
<p class="article"> 為了聲明一個final變量，你可以在類型之前的變量聲明使用final關鍵字，比如： </p>
<p class="article">final int aFinalVar = 0;</p>
<p class="article"> 前面的語句聲明了一個final變量并一起對它進行了初始化。如果你在后面還想給aFinalVar賦其它的值的話，就會導致一個編譯錯誤。在必要的時候，你可以推遲對一個final本地變量進行初始化。你可以先定義，然后在之后再初始化，如下：
</p>
<p class="article">final int blankfinal;</p>
<p class="article">. . .</p>
<p class="article">blankfinal = 0;</p>
<p class="article"> 已經聲明了但是還沒有初始化的final本地變量稱為空白final。同時，一旦final本地變量被初始化，它就不能再設置了。并且之后的任何對blankfinal賦值的操作都將導致一個編譯錯誤。</p>
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