?? 13.htm
字號(hào):
int x=5,y=7;<br>
boolean b=(x==y);</p>
<p align="JUSTIFY">則b的值是false。也就是0，計(jì)算機(jī)中用0可以代表false。</p>
<p align="JUSTIFY">4)其他運(yùn)算符<br>
1.三目運(yùn)算符<br>
Java中的三墓運(yùn)算符與C語言中的完全相同，使用形式為：<br>
x?y:z;<br>
這就是說，先計(jì)算x的值，若x為真，怎整個(gè)表達(dá)式的結(jié)果為y的值，若x為假，則整個(gè)表達(dá)式的值為表達(dá)式z的值。<br>
例如：<br>
int x=5,y=8,z=2;<br>
int k=x<3?y:z; //因?yàn)閤<3，所以k=2；<br>
int j=x>0?x:-x //y的值始終為x的絕對(duì)值。</p>
<p align="JUSTIFY">2.邏輯運(yùn)算<br>
邏輯運(yùn)算是針對(duì)布爾型數(shù)據(jù)進(jìn)行的云酸，運(yùn)算的結(jié)果仍然是布爾型量。常用的運(yùn)算符如下：</p>
<table width="570" border="1" bordercolor="#FF9999">
<tr bordercolor="#FF9999">
<td width="143">
<div align="center">運(yùn)算符</div>
</td>
<td width="143">
<div align="center">運(yùn)算</div>
</td>
<td width="93">
<div align="center">例子</div>
</td>
<td width="193">
<div align="center">解釋</div>
</td>
</tr>
<tr>
<td>&</td>
<td>非簡(jiǎn)潔與</td>
<td>x&y</td>
<td>x,y都真時(shí)結(jié)果才為真</td>
</tr>
<tr>
<td>|</td>
<td>非簡(jiǎn)潔或</td>
<td>x|y</td>
<td>x,y都假時(shí)結(jié)果才為假</td>
</tr>
<tr>
<td>!</td>
<td>取反</td>
<td>!=x</td>
<td>x真時(shí)為假，x假時(shí)為真</td>
</tr>
<tr>
<td>^</td>
<td>取或</td>
<td>x^y</td>
<td>x,y同真假時(shí)結(jié)果為假</td>
</tr>
<tr>
<td>&&</td>
<td>簡(jiǎn)潔與</td>
<td>x&&y</td>
<td>x,y都真時(shí)結(jié)果才為真</td>
</tr>
<tr>
<td>||</td>
<td>簡(jiǎn)潔或</td>
<td>x||y</td>
<td>x,y都假時(shí)結(jié)果才為假</td>
</tr>
</table>
<p align="JUSTIFY">3.位運(yùn)算<br>
位運(yùn)算是對(duì)操作數(shù)以二進(jìn)制為單位進(jìn)行的操作和運(yùn)算，位運(yùn)算的操作數(shù)和結(jié)果都是整形變量。常用的規(guī)則列表如下：</p>
<table width="570" border="1" bordercolor="#FF9999">
<tr>
<td width="77">
<div align="center">運(yùn)算符</div>
</td>
<td width="127">
<div align="center">運(yùn)算</div>
</td>
<td width="86">
<div align="center">例子</div>
</td>
<td width="282">
<div align="center">解釋</div>
</td>
</tr>
<tr>
<td width="77">
<div align="center">~</div>
</td>
<td width="127">
<div align="center">位反</div>
</td>
<td width="86">
<div align="center">~x</div>
</td>
<td width="282">
<div align="center">將x按比特位取反</div>
</td>
</tr>
<tr>
<td width="77">
<div align="center">>></div>
</td>
<td width="127">
<div align="center">右移</div>
</td>
<td width="86">
<div align="center">x>>a</div>
</td>
<td width="282">
<div align="center">x各比特位右移a位</div>
</td>
</tr>
<tr>
<td width="77">
<div align="center"><<</div>
</td>
<td width="127">
<div align="center">左移</div>
</td>
<td width="86">
<div align="center">x<<a</div>
</td>
<td width="282">
<div align="center">x各比特位左移a位</div>
</td>
</tr>
<tr>
<td width="77">
<div align="center">>>></div>
</td>
<td width="127">
<div align="center">不帶符號(hào)的右移</div>
</td>
<td width="86">
<div align="center">x>>>a</div>
</td>
<td width="282">
<div align="center">x各比特位右移a位，左邊的空位填零</div>
</td>
</tr>
</table>
<p align="JUSTIFY"> </p>
<p align="JUSTIFY">2.復(fù)雜運(yùn)算符<br>
復(fù)雜運(yùn)算符是在先進(jìn)行某種云酸后，再把運(yùn)算結(jié)果賦給變量。舉例如下：<br>
</p>
<table width="570" border="1" bordercolor="#FF9999">
<tr>
<td>
<div align="center">運(yùn)算符</div>
</td>
<td>
<div align="center">例子</div>
</td>
<td>
<div align="center">解釋</div>
</td>
</tr>
<tr>
<td>
<div align="center">+=</div>
</td>
<td>
<div align="center">x+=a</div>
</td>
<td>
<div align="center">x=x+a</div>
</td>
</tr>
<tr>
<td>
<div align="center">-+</div>
</td>
<td>
<div align="center">x-=a</div>
</td>
<td>
<div align="center">x=x-a</div>
</td>
</tr>
<tr>
<td>
<div align="center">*=</div>
</td>
<td>
<div align="center">x*=a</div>
</td>
<td>
<div align="center">x=x*a</div>
</td>
</tr>
<tr>
<td>
<div align="center">/=</div>
</td>
<td>
<div align="center">x/=a</div>
</td>
<td>
<div align="center">x=x/a</div>
</td>
</tr>
<tr>
<td>
<div align="center">%=</div>
</td>
<td>
<div align="center">x%=a</div>
</td>
<td>
<div align="center">x=x%a</div>
</td>
</tr>
<tr>
<td>
<div align="center">&=</div>
</td>
<td>
<div align="center">x&=a</div>
</td>
<td>
<div align="center">x=x&a</div>
</td>
</tr>
<tr>
<td>
<div align="center">|=</div>
</td>
<td>
<div align="center">x|=a</div>
</td>
<td>
<div align="center">x=x|a</div>
</td>
</tr>
<tr>
<td>
<div align="center">^=</div>
</td>
<td>
<div align="center">x^=a</div>
</td>
<td>
<div align="center">x=x^a</div>
</td>
</tr>
<tr>
<td>
<div align="center"><<=</div>
</td>
<td>
<div align="center">x<<=a</div>
</td>
<td>
<div align="center">x=x<<a</div>
</td>
</tr>
<tr>
<td>
<div align="center">>>=</div>
</td>
<td>
<div align="center">x>>=a</div>
</td>
<td>
<div align="center">x=x>>a</div>
</td>
</tr>
<tr>
<td>
<div align="center"><<<=</div>
</td>
<td>
<div align="center">x<<<=a</div>
</td>
<td>
<div align="center">x=x<<<a</div>
</td>
</tr>
</table>
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