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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>
<p></p>
<p class="article"><b>4.4.4 復制數組</b></p>
<p></p>
<p class="article"> 下面的程序ArrayCopyDemo使用了arraycopy方法來從copyForm數組復制元素到copyTo數組：
</p>
<p class="article">public class ArrayCopyDemo {</p>
<p class="article"> public static void main(String[] args) {</p>
<p class="article"> char[] copyFrom = { 'd', 'e', 'c', 'a', 'f', 'f',
'e',</p>
<p class="article">			 'i', 'n', 'a', 't', 'e', 'd' };</p>
<p class="article"> char[] copyTo = new char[7];</p>
<p class="article"> System.arraycopy(copyFrom, 2, copyTo, 0, 7);</p>
<p class="article"> System.out.println(new String(copyTo));</p>
<p class="article"> }</p>
<p class="article">}</p>
<p class="article"> 程序中調用arraycopy方法，開始復制所以為2的源數組元素。因為數組的索引是從0開始的，所以復制是從第3個元素開始的，即從'c'開始。Arraycopy方法將復制的元素復制到目標數組中，目標數組的索引是從0開始的，即復制到目標數組的第一個元素開始。這個程序一共復制了7個元素'c'、
'a、 'f'、 'f'、 'e'、 'i'和'n'。實際上arraycopy方法是從"decaffeinated"復制"caffein"，如圖21所示：
</p>
<p></p>
<p class="article"><img src="/pcedu/empolder/gj/java/images/10717/Image59.gif" width=459 height=171></p>
<p class="article">（圖21）</p>
<p class="article"> 這里注意，目標數組必須在調用arraycopy之間分配內存，而且這個內存空間必須足夠大以容納被復制的數據。</p>
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