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<div align="center" class="title">JAVA程序員必讀：基礎(chǔ)篇（4）對象和簡單數(shù)據(jù)對象</div>
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<div align="center"><font color="#666666">編譯：ZSC/太平洋網(wǎng)絡(luò)學(xué)院</font></div>
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<div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［責(zé)編:爆破手］</a></div>
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<p class="article"><b>對象和簡單數(shù)據(jù)對象</b></p>
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<p> <span class="article"><b>（4）修改StringBuffers</b> </span></p>
<p class="article"> 用在reverseIt的append方法只是一個StringBuffer方法的其中一種，它在StringBuffer末尾增補(bǔ)了一個數(shù)據(jù)。有幾種append方法來增補(bǔ)各個類型的數(shù)據(jù)（比如float、int、boolean以及對象）到StringBuffer末尾。但是在增補(bǔ)操作之前，數(shù)據(jù)都要先轉(zhuǎn)換為字符串。
</p>
<p class="article"> 下面講講插入字符：</p>
<p class="article">有時候，你可能想插入數(shù)據(jù)到StringBuffer中間。你可以使用StringBuffer的insert方法來實現(xiàn)。以下的這個例子就是介紹如何將一個字符串插入到StringBuffer中去的：
</p>
<p class="article">StringBuffer sb = new StringBuffer("Drink Java!");</p>
<p class="article">sb.insert(6, "Hot ");</p>
<p class="article">System.out.println(sb.toString());</p>
<p class="article">這些代碼將輸出： </p>
<p class="article">Drink Hot Java!</p>
<p class="article"> 利用StringBuffer的許多insert方法，你可以在插入數(shù)據(jù)之前指定索引。在上面的例子中，"Hot
"要插到"Java"的'J'之前。因為索引是從0開始的，所以'J'的索引為6。為了插入數(shù)據(jù)到StringBuffer之前，使用索引0.為了在StringBuffer的末尾插入數(shù)據(jù)，你可以將所以等于StringBuffer的長度或者使用append方法來增補(bǔ)。</p>
<p class="article">下面討論設(shè)置字符：</p>
<p class="article"> 另外一個有用的StringBuffer修改量是setCharAt，它在StringBuffer的指定位置用參數(shù)列表中的指定字符來替換字符。SetCharAt在你想重新使用StringBuffer的時候是很有用的。</p>
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