blocks|key|400575|text|%7C=的读取方式与%2B=相同。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|400576|notification.defaults+%7C=+Notification.DEFAULT_SOUND;|code-block|syntax|javascript|400577|等同于|400578|notification.defaults+=+notification.defaults+%7C+Notification.DEFAULT_SOUND;|400579|其中%7C是逐位OR运算符。|400580|所有运算符都引用为here。|400581|使用按位运算符是因为，这些常量通常使int能够携带标志。|400582|如果你对这些常量执行look，你会发现它们是2的幂：|400583|public+static+final+int+DEFAULT_SOUND+=+1;
public+static+final+int+DEFAULT_VIBRATE+=+2;+//+is+the+same+than+1<<1+or+10+in+binary
public+static+final+int+DEFAULT_LIGHTS+=+4;+//+is+the+same+than+1<<2+or+100+in+binary|400584|因此，您可以使用逐位OR添加标志|400585|int+myFlags+=+DEFAULT_SOUND+%7C+DEFAULT_VIBRATE;+//+same+as+001+%7C+010,+producing+011|400586|所以|400587|myFlags+%7C=+DEFAULT_LIGHTS;|400588|简单地说，就是我们添加一个标志。|400589|对称地，我们使用&测试设置了一个标志：|400590|boolean+hasVibrate+=+(DEFAULT_VIBRATE+&+myFlags)+!=+0;|400591|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html|1|http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/1.6_r2/android/app/Notification.java^0|0|2|8|2|0|0|0|0|2|1|0|9|4|0|0|0|A|4|1|0|0|0|0|0|0|0|8|1|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1S|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|1T|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1U|8|@$9|1V|A|1W|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1X|8|@]|D|@$9|1Y|A|1Z|1|20]]|E|$]]|$1|S|3|T|5|6|7|21|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|22|8|@]|D|@$9|23|A|24|1|25]]|E|$]]|$1|W|3|X|5|H|7|26|8|@]|D|@]|E|$I|J]]|$1|Y|3|Z|5|6|7|27|8|@]|D|@]|E|$]]|$1|10|3|11|5|H|7|28|8|@]|D|@]|E|$I|J]]|$1|12|3|13|5|6|7|29|8|@]|D|@]|E|$]]|$1|14|3|15|5|H|7|2A|8|@]|D|@]|E|$I|J]]|$1|16|3|17|5|6|7|2B|8|@]|D|@]|E|$]]|$1|18|3|19|5|6|7|2C|8|@$9|2D|A|2E|B|C]]|D|@]|E|$]]|$1|1A|3|1B|5|H|7|2F|8|@]|D|@]|E|$I|J]]|$1|1C|3|-4|5|6|7|2G|8|@]|D|@]|E|$]]]|1D|$1E|$5|1F|1G|1H|E|$1I|1J]]|1K|$5|1F|1G|1H|E|$1I|1L]]]]

<code>|=</code> reads the same way as <code>+=</code>.

<pre><code>notification.defaults |= Notification.DEFAULT_SOUND;
</code></pre>

is the same as

<pre><code>notification.defaults = notification.defaults | Notification.DEFAULT_SOUND;
</code></pre>

where <code>|</code> is the bit-wise OR operator.

All operators are referenced <a href="http://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html">here</a>.

A bit-wise operator is used because, as is frequent, those constants enable an int to carry flags.

If you <a href="http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/1.6_r2/android/app/Notification.java">look</a> at those constants, you'll see that they're in powers of two :

<pre><code>public static final int DEFAULT_SOUND = 1;
public static final int DEFAULT_VIBRATE = 2; // is the same than 1&lt;&lt;1 or 10 in binary
public static final int DEFAULT_LIGHTS = 4; // is the same than 1&lt;&lt;2 or 100 in binary
</code></pre>

So you can use bit-wise OR to add flags

<pre><code>int myFlags = DEFAULT_SOUND | DEFAULT_VIBRATE; // same as 001 | 010, producing 011
</code></pre>

so

<pre><code>myFlags |= DEFAULT_LIGHTS;
</code></pre>

simply means we add a flag.

And symmetrically, we test a flag is set using <code>&amp;</code> :

<pre><code>boolean hasVibrate = (DEFAULT_VIBRATE &amp; myFlags) != 0;
</code></pre>

blocks|key|400627|text|这是这个的缩写：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|400628|notification.defaults+=+notification.defaults+%7C+Notification.DEFAULT_SOUND;|code-block|syntax|javascript|400629|%7C是按位OR运算。|offset|length|style|CODE|400630|entityMap^0|0|0|0|1|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

It's a shortening for this:

<pre><code>notification.defaults = notification.defaults | Notification.DEFAULT_SOUND;
</code></pre>

And <code>|</code> is a bit-wise OR.

blocks|key|400668|text|%7C是bitwise-or运算符，它的应用与%2B=类似。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|400669|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Bitwise_operation#OR^0|0|1|L|2|2|A|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

<code>|</code> is the <a href="http://en.wikipedia.org/wiki/Bitwise_operation#OR">bitwise-or</a> operator, and it is being applied like <code>+=</code>.

blocks|key|400724|text|注意：%7C%7C=不存在。(逻辑或)您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|400725|y=+y+%7C%7C+expr;+//+expr+is+NOT+evaluated+if+y==true|code-block|syntax|javascript|400726|或|400727|y+=+expr+?+true+:+y;++//+expr+is+always+evaluated.|400728|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Note: ||= does not exist. (logical or)
You can use 

<pre><code>y= y || expr; // expr is NOT evaluated if y==true
</code></pre>

or

<pre><code>y = expr ? true : y; // expr is always evaluated.
</code></pre>

I tried searching using Google Search and Stack&nbsp;Overflow, but it didn't show up any results. I have seen this in opensource library code:

<pre><code>Notification notification = new Notification(icon, tickerText, when);
notification.defaults |= Notification.DEFAULT_SOUND;
notification.defaults |= Notification.DEFAULT_VIBRATE;
</code></pre>

What does "|=" ( <code>pipe equal operator</code> ) mean?

What does "|=" mean? (pipe equal operator)

我尝试使用Google搜索和Stack Overflow进行搜索，但没有显示任何结果。我在开源库代码中看到了这一点：Notification notification = new Notification(icon, tickerText, when);notification.defaults |= Notifica...

问"|=“是什么意思？(管道等于运算符)
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