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<div align="center" class="title">JAVA程序員必讀：基礎篇（3）語言基礎</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>語言基礎</b> </p>
<p> </p>
<p></p>
<p><b><span class="article">3.2.1 算術操作符</span></b></p>
<p class="coffee"><span class="article">續上一頁</span></p>
<p class="article"> 還是讓我們好好看看這個SortDemo程序是怎樣工作的。下面是控制外部循環的語句： </p>
<p class="article"><span class="blue">for (int i = arrayOfInts.length;
--i >= 0; ) {</span></p>
<p class="article"><span class="blue"> ...</span></p>
<p class="article"><span class="blue">}</span></p>
<p class="article"> 這個for語句是一個循環結構。其中--i >= 0給出了循環的條件，即--i大于等于0就繼續循環，一旦小于0就結束循環。使用前綴--意味著最后的一次循環迭代是發生在當i等于0的時候。如果我們改變改變一下使用后綴的，那么循環迭代的最后一次發生在當i等于-1的時候，這樣就會發生錯誤，因為數組的下標是從0開始的，-1是一個無效的數組下標。</p>
<p class="article"> 程序中其它兩個循環使用了后綴的++。在兩個例子中，使用前綴或者后綴是沒有問題的。當其中一個運算符號返回的數值沒有用到，則約定使用后綴的。
</p>
<p class="article">下面的表格總結自增/自減運算符：</p>
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<p class="article">運算符
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<p class="article">用法
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<p class="article">描述
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<p class="article">++
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<p class="article">op++
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<p class="article">自增1；它是在自增之前計算op的數值的。
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<p class="article">++
</td>
<td width="33%" valign="TOP">
<p class="article">++op
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<td width="33%" valign="TOP">
<p class="article">自增1；它是在自增之后計算op的數值的。
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<p class="article">--
</td>
<td width="33%" valign="TOP">
<p class="article">op--
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<p class="article">自減1；它是在自減之前計算op的數值的。
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<p class="article">--
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<td width="33%" valign="TOP">
<p class="article">--op
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<td width="33%" valign="TOP">
<p class="article">自減1；它是在自減之后計算op的數值的。
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