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<div align="center" class="title">JAVA程序员必读：基础篇（3）语言基础</div>
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<div align="center"><font color="#666666">编译：ZSC/太平洋网络学院</font></div>
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<div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［责编:爆破手］</a></div>
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<p class="article"> <b>语言基础</b> </p>
<p> </p>
<p></p>
<p><b><span class="article">3.2.1 算术操作符</span></b></p>
<p class="coffee"><span class="article">续上一页</span></p>
<p class="article"> 还是让我们好好看看这个SortDemo程序是怎样工作的。下面是控制外部循环的语句： </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"> 这个for语句是一个循环结构。其中--i >= 0给出了循环的条件，即--i大于等于0就继续循环，一旦小于0就结束循环。使用前缀--意味着最后的一次循环迭代是发生在当i等于0的时候。如果我们改变改变一下使用后缀的，那么循环迭代的最后一次发生在当i等于-1的时候，这样就会发生错误，因为数组的下标是从0开始的，-1是一个无效的数组下标。</p>
<p class="article"> 程序中其它两个循环使用了后缀的++。在两个例子中，使用前缀或者后缀是没有问题的。当其中一个运算符号返回的数值没有用到，则约定使用后缀的。
</p>
<p class="article">下面的表格总结自增/自减运算符：</p>
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<p class="article">运算符
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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；它是在自增之前计算op的数值的。
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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">自增1；它是在自增之后计算op的数值的。
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<p class="article">--
</td>
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<p class="article">op--
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<p class="article">自减1；它是在自减之前计算op的数值的。
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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">自减1；它是在自减之后计算op的数值的。
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