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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">3.2.3 移位和邏輯運算符</span></b></p>
<p class="article"> 移位運算符通過對第一個運算對象左移或者右移位來對數據執行位操作。下面的這個表總結了JAVA編程語言中有效的移位運算符。</p>
<p> </p>
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<p class="article">運算符
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<td width="33%" valign="TOP">
<p class="article">用法
</td>
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<p class="article">操作
</td>
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<td width="33%" valign="TOP">
<p class="article">>>
</td>
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<p class="article">op1 >> op2
</td>
<td width="33%" valign="TOP">
<p class="article">將op1右移op2個位
</td>
</tr>
<tr>
<td width="33%" valign="TOP">
<p class="article"><<
</td>
<td width="33%" valign="TOP">
<p class="article">op1 << op2
</td>
<td width="33%" valign="TOP">
<p class="article">將op1左移op2個位
</td>
</tr>
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<td width="33%" valign="TOP">
<p class="article">>>>
</td>
<td width="33%" valign="TOP">
<p class="article">op1 >>> op2
</td>
<td width="33%" valign="TOP">
<p class="article">將op1右移op2個位（無符號的）
</td>
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<p class="article"> 每一個運算符移動左邊的運算對象的位數都是由右邊的運算符給出的。這個移位的方向取決于運算符本身。比如，下面的語句是實現將整數13右移1位的目的：</p>
<p class="article">13 >> 1;</p>
<p class="article"> 13的二進制為1101.右移一位的結果為110，即為十進制的6.左邊的位用零來填充。下面的表給出了JAVA編程語言提供的四種運算符來對它們的運算對象執行按位操作：</p>
<table BORDER cellspacing=1 cellpadding=7 width=98% align="center">
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<td width="33%" valign="TOP">
<p class="article">運算符
</td>
<td width="33%" valign="TOP">
<p class="article">用法
</td>
<td width="33%" valign="TOP">
<p class="article">操作
</td>
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<tr>
<td width="33%" valign="TOP">
<p class="article">&
</td>
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<p class="article">op1 & op2
</td>
<td width="33%" valign="TOP">
<p class="article">按位與
</td>
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<td width="33%" valign="TOP">
<p class="article">|
</td>
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<p class="article">op1 | op2
</td>
<td width="33%" valign="TOP">
<p class="article">按位或
</td>
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<p class="article">^
</td>
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<p class="article">op1 ^ op2
</td>
<td width="33%" valign="TOP">
<p class="article">按位異或
</td>
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<td width="33%" valign="TOP">
<p class="article">~
</td>
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<p class="article">~op2
</td>
<td width="33%" valign="TOP">
<p class="article">按位求補
</td>
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<p class="article"> 當它的運算對象為數字的時候，&運算符為每一個運算對象的每位執行按位AND功能。AND在運算對象的相應位為1的時候結果才為1，其余情況結果都為0，如下表所示：</p>
<table BORDER cellspacing=1 cellpadding=7 width=98% align="center">
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<td width="33%" valign="TOP" class="article">
<p>op1
</td>
<td width="33%" valign="TOP" class="article">
<p>op2
</td>
<td width="33%" valign="TOP" class="article">
<p>結果
</td>
</tr>
<tr>
<td width="33%" valign="TOP" class="article">
<p>0
</td>
<td width="33%" valign="TOP" class="article">
<p>0
</td>
<td width="33%" valign="TOP" class="article">
<p>0
</td>
</tr>
<tr>
<td width="33%" valign="TOP" class="article">
<p>0
</td>
<td width="33%" valign="TOP" class="article">
<p>1
</td>
<td width="33%" valign="TOP" class="article">
<p>0
</td>
</tr>
<tr>
<td width="33%" valign="TOP" class="article">
<p>1
</td>
<td width="33%" valign="TOP" class="article">
<p>0
</td>
<td width="33%" valign="TOP" class="article">
<p>0
</td>
</tr>
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<td width="33%" valign="TOP" class="article">
<p>1
</td>
<td width="33%" valign="TOP" class="article">
<p>1
</td>
<td width="33%" valign="TOP" class="article">
<p>1
</td>
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