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C#位运算符（C#按位与、按位或 等） - 更多技术 - 清泛网 - 专注C/C++及内核技术
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a ^ b
<<
位左移运算
2
a<<4
>>
位右移运算
2
a>>2
1、位逻辑非运算
位逻辑非运算是单目的，只有一个运算对象。位逻辑非运算按位对运算对象的值进行非运算...
Regex Last occurrence?
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answered Dec 4 '11 at 11:30
stemastema
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What is the memory consumption of an object in Java?
... example, the JVM or native compiler might decide to store a boolean[] in 64-bit long chunks like a BitSet. It does not have to tell you, so long as the program gives the same answers.
It might allocate some temporary Objects on the stack.
It may optimize some variables or method calls to...
Using DISTINCT and COUNT together in a MySQL Query
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edited Sep 8 '14 at 10:19
user3414693
answered Jun 16 '09 at 15:47
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In Java, what is the best way to determine the size of an object?
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470
You can use the java.lang.instrument package
Compile and put this class in a JAR:
import jav...
Xcode 4 - “Valid signing identity not found” error on provisioning profiles on a new Macintosh insta
I had a Macintosh I used to develop iPhone apps with using XCode 4.
I now have a new Macintosh with a new install of... everything.
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How do I concatenate strings in Swift?
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answered Jun 4 '14 at 9:55
FogmeisterFogmeister
68.3k3535 gold badges180180 silver badges266266 bronze badges
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Linux command or script counting duplicated lines in a text file?
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48
Almost the same as borribles' but if you add the d param to uniq it only shows duplicates.
sor...
Get the week start date and week end date from week number
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answered Aug 12 '09 at 16:14
Robin DayRobin Day
92.5k2222 gold badges110110 silver badges160160 bronze badges
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Regular expression to match standard 10 digit phone number
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^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}$
Matches the following
123-456-7890
(123) 456-7890
123 456 7890
123.456.7890
+91 (123) 456-7890
If you do not want a match on non-US numbers use
^(\+0?1\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}$
Update :
As noticed by ...