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How to synchronize a static variable among threads running different instances of a class in Java?
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194
There are several ways to synchronize access to a static variable.
Use a synchronized static...
Scala: what is the best way to append an element to an Array?
...repend it:
0 +: array :+ 4
should produce:
res3: Array[Int] = Array(0, 1, 2, 3, 4)
It's the same as with any other implementation of Seq.
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How to run a background task in a servlet based web application?
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218
Your problem is that you misunderstand the purpose of the servlet. It's intented to act on HTTP...
How do I install an old version of Django on virtualenv?
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142
There was never a Django 1.0.7. The 1.0 series only went up to 1.0.4. You can see all the rele...
In Scala, what exactly does 'val a: A = _' (underscore) mean?
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144
val a: A = _ is a compile error. For example:
scala> val a: String = _
<console>:1: ...
Print all day-dates between two dates [duplicate]
...up with this:
from datetime import date, timedelta
sdate = date(2008, 8, 15) # start date
edate = date(2008, 9, 15) # end date
delta = edate - sdate # as timedelta
for i in range(delta.days + 1):
day = sdate + timedelta(days=i)
print(day)
The output:
2008-08-15
2008-08-16
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Concept behind these four lines of tricky C code
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The number 7709179928849219.0 has the following binary representation as a 64-bit double:
01000011 00111011 01100011 01110101 01010011 00101011 00101011 01000011
+^^^^^^^ ^^^^---- -------- -------- -------- -------- -------- --------
+ s...
Create a pointer to two-dimensional array
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10 Answers
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解决：error while loading shared libraries: libpcre.so.1: cannot open ...
解决：error while loading shared libraries: libpcre.so.1: cannot open shared object file: No such file or directoryerror while loading shared libraries: xxx so 1: cannot open shared object file: No such file or directory错误原因是 error while loading shared libraries: xxx.so.1: cannot open...
Angularjs if-then-else construction in expression
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219
Angular expressions do not support the ternary operator before 1.1.5, but it can be emulated li...