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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">（3）存取器函數</span></b></p>
<p class="article"> 如果你想從一個字符串或者字符串緩沖區得到多個字符，你可以使用substring方法。這個substring方法有兩個版本，如下表所示：
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<p class="article">方法
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<p class="article">描述
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<p class="article">String substring(int)
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<p class="article">返回一個新的字符串，它是這個字符串或者字符串緩沖區的一個子串。第一個整數參數指定了第一個字符的索引。第二個整數參數是最后字符-1的索引。這個子串的長度就是第二個整數減去第一個整數。如果第二個整數沒有，那么substring就擴展到整個字符串的結尾。
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<p class="article">String substring(int,int)
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<p class="article"> 下面的代碼是得到字符串"Niagara. O roar again!"從索引為11到索引為15之間的子串，結果得到單詞"roar"：
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<p class="article">String anotherPalindrome = "Niagara. O roar again!";
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<p class="article">String roar = anotherPalindrome.substring(11, 15);
</p>
<p class="article">如圖17所示：</p>
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<p class="article"><img src="/pcedu/empolder/gj/java/images/10717/Image55.gif" width=545 height=140></p>
<p class="article">（圖17）</p>
<p class="article"> 使用substring方法來得到字符串或者字符串緩沖區的一部分。這里一定要記住索引是從0開始的。</p>
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