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<title>JAVA程序員必讀：基礎篇（4）對象和簡單數據對象 ---- |><| 太平洋電腦網 -> 網絡學院* 開發教室</title>
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<div align="center" class="title">JAVA程序員必讀：基礎篇（4）對象和簡單數據對象</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>對象和簡單數據對象</b></p>
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<p><b><span class="article">4.4 數組</span></b></p>
<p class="article"> 在任何的編程語言中，數組都是一個重要的數據結構。數組是一個固定長度的結構，它存儲多個相同類型的數值。你可以在數組中集合相同類型的數值。數組直接被JAVA編程語言所支持，所以沒有一個數組類。數組是一個Object類的一個不明顯的擴展，所以你可以指定一個數組給一個類型定義為Object的變量。</p>
<p class="article"> JAVA平臺集合了它的類到功能包中。不是編寫你自己的類，你可以使用有平臺提供的類。這節教程中要討論的絕大多數的類都是java.lang包的成員函數。所有java.lang中的類對你的程序都是有效的。</p>
<p class="article"> 數組的長度在數組創建的時候就已經確定。一旦創建以后，數組就有了固定長度的結構，如圖19所示：
</p>
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<p class="article"><img src="/pcedu/empolder/gj/java/images/10717/Image57.gif" width=470 height=131></p>
<p class="article">（圖19）</p>
<p class="article"> 數組元素就是數組中的一個數值，可以通過數組中的位置來訪問它。</p>
<p class="article"> 如果你想在一個結構中存儲不同類型的數據，或者如果你需要一個長度可以動態改變的結構，可以使用Collection，比如Vector而不用數組。</p>
<p class="article">本教程中將討論以下的幾個方法：</p>
<ol>
<p>
<li class="article"><a href="10831_1.htm" target="_blank">創建和使用數組合</a></li>
<p></p>
<p>
<li class="article"><a href="10901.htm">對象的數組</a></li>
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<p>
<li class="article"><a href="10903.htm">數組的數組</a></li>
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<li class="article"><a href="10904.htm">復制數組</a></li>
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<p align="center" class="article"><a href="10830_3.htm">[上一頁]</a>
<a href="10831_1.htm">[下一頁]</a></p>
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