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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> <span class="article"><b>（4）修改StringBuffers</b> </span></p>
<p class="article"> reverseIt方法使用StringBuffer的append方法來增加一個字符到dest字符串末尾：
</p>
<p class="article">class ReverseString {</p>
<p class="article"> public static String reverseIt(String source)
{</p>
<p class="article"> int i, len = source.length();</p>
<p class="article"> StringBuffer dest = new StringBuffer(len);</p>
<p></p>
<p class="article"> for (i = (len - 1); i >= 0; i--) {</p>
<p class="article"> dest.append(source.charAt(i));</p>
<p class="article"> }</p>
<p class="article"> return dest.toString();</p>
<p class="article"> }</p>
<p class="article">}</p>
<p class="article"> 如果這個被增加的字符導致StringBuffer的大小超過當前的容量，這個StringBuffer就會為它分配更多的內存。因為內存分配示相對高級的操作，所以你可以同時初始化StringBuffer的容量為較合理的大小來使你的代碼更有效率。比如reverseIt方法以初始的容量來構造StringBuffer等于源字符串的長度，以只為dest分配一次內存。</p>
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